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• Just how rare is the Havard Electronics H-1 amp? - mrflex65 06:30:50 11/08/24 (2)
  • RE: Just how rare is the Havard Electronics H-1 amp? - airheadair 18:47:39 11/16/24 (0)
  • Very rare nt - Ralph 10:50:30 11/08/24 (0)
• NYAL OTL 1 Julius futterman repair. - pennyford 01:57:55 11/02/24 (5)
  • RE: NYAL OTL 1 Julius futterman repair. - pennyford 16:42:45 11/02/24 (0)
  • RE: NYAL OTL 1 Julius futterman repair. - Lew 12:48:01 11/02/24 (3)
    • RE: NYAL OTL 1 Julius futterman repair. - pennyford 16:56:12 11/02/24 (2)
      • RE: NYAL OTL 1 Julius futterman repair. - rogerh113 07:51:43 11/03/24 (1)
        • I have a schematic... - Lew 11:22:49 11/20/24 (0)
• Study of a circlotron with cathode and current feedback - cellailuca 10:05:51 10/12/24 (11)
  • Nice circuit! - Ralph 08:38:42 10/16/24 (7)
    • Output impedance is 2.8 Ohm - cellailuca 09:08:02 10/16/24 (6)
      • It's actually lower, it is 1.8 Ohm - cellailuca 09:15:13 10/16/24 (5)
        • Current feedback usually raises output impedance FWIW nt - Ralph 09:19:01 10/16/24 (4)
          • RE: Current feedback usually raises output impedance FWIW nt - cellailuca 09:03:53 10/17/24 (3)
            • In that case I would surmise its actually Voltage feedback nt - Ralph 09:11:59 10/17/24 (2)
              • RE: In that case I would surmise its actually Voltage feedback nt - cellailuca 03:12:43 10/18/24 (1)
                • +1 good work! - Ralph 11:48:12 10/18/24 (0)
  • Output spectrum - cellailuca 01:27:21 10/14/24 (0)
  • Better schematic - cellailuca 10:07:00 10/12/24 (1)
    • Detail - cellailuca 10:16:55 10/12/24 (0)
• Reference 3A NEFES - MP 12:45:38 03/15/24 (8)
  • RE: Reference 3A NEFES - cellailuca 09:11:17 03/24/24 (0)
  • RE: Reference 3A NEFES - ltman 11:28:30 03/19/24 (2)
    • Not exactly. - Ralph 08:00:13 03/20/24 (1)
      • RE: Not exactly. - ltman 13:49:04 03/21/24 (0)
  • I am still stunned - ltman 05:00:23 03/18/24 (3)
    • RE: I am still stunned - GEO 08:09:00 09/09/24 (0)
    • RE: I am still stunned - Lew 17:06:47 04/23/24 (0)
    • Depends on the Maggies, but regardless you'll need a set of ZEROs - Ralph 11:15:12 03/19/24 (0)
• Mystery DIY OTL. Help needed to figure out possible tube compliment - pennyford 17:46:36 03/12/24 (19)
  • Luxman MQ 36? - cellailuca 01:51:47 03/19/24 (3)
    • I don't think so. - Ralph 11:12:36 03/19/24 (0)
    • Luxman MQ 36 schematic - cellailuca 09:00:39 03/19/24 (1)
      • RE: Luxman MQ 36 schematic - pennyford 15:55:50 03/19/24 (0)
  • RE: Mystery DIY OTL. Help needed to figure out possible tube compliment - pennyford 13:37:16 03/16/24 (0)
  • RE: Mystery DIY OTL. Help needed to figure out possible tube compliment - Lew 11:05:07 03/15/24 (1)
    • Maybe not Luxman - Lew 13:55:40 03/15/24 (0)
  • RE: Mystery DIY OTL. Help needed to figure out possible tube compliment - pennyford 17:34:08 03/13/24 (1)
    • RE: 1st tube appears to be a 12A*7 of some kind. - Ralph 08:22:15 03/14/24 (0)
  • RE: Mystery DIY OTL. Help needed to figure out possible tube compliment - pennyford 17:32:44 03/13/24 (0)
  • RE: Mystery DIY OTL. Help needed to figure out possible tube compliment - pennyford 17:30:41 03/13/24 (0)
  • This looks like a low power stereo OTL to me. - Ralph 14:17:20 03/13/24 (6)
    • RE: This looks like a low power stereo OTL to me. - garymuffley 10:03:40 03/14/24 (5)
      • I doubt 6336s - Ralph 10:43:25 03/14/24 (4)
        • Here's a Luxman with 6336 outputs - garymuffley 09:31:31 03/15/24 (3)
          • No photo, but if they didn't use ceramic sockets it would have been unreliable nt - Ralph 09:35:49 03/15/24 (2)
            • Sorry, here is a photo - garymuffley 21:20:43 03/15/24 (1)
              • Apparently not the same amp nt - Ralph 12:35:52 03/18/24 (0)
  • RE: Mystery DIY OTL. Help needed to figure out possible tube compliment - Steve O 12:22:29 03/13/24 (0)
• Futterman - AJ 06:04:12 03/06/24 (4)
  • I just saw that you are having problems with Beveridge amplifiers - Lew 19:20:22 06/22/24 (2)
    • RE: I just saw that you are having problems with Beveridge amplifiers - AJ 05:17:07 06/24/24 (1)
      • RE: I just saw that you are having problems with Beveridge amplifiers - Lew 14:39:40 08/17/24 (0)
  • RE: Futterman - 33dot33rpm 09:30:57 03/06/24 (0)
• Futterman H-3 restoration - 33dot33rpm 17:51:38 03/04/24 (24)
  • Futterman H-3 check for oscillation - 33dot33rpm 17:07:07 03/07/24 (1)
    • If they are going to oscillate, it will be load dependent. nt - Ralph 14:10:53 03/13/24 (0)
  • RE: Futterman H-3 hum level - 33dot33rpm 17:03:43 03/07/24 (0)
  • Futterman H-3 square wave - 33dot33rpm 17:01:25 03/07/24 (0)
  • Futterman H-3 restoration frequency response - 33dot33rpm 16:58:18 03/07/24 (4)
    • RE: Futterman H-3 restoration frequency response - rogerh113 07:16:30 03/08/24 (3)
      • RE: Futterman H-3 restoration frequency response - 33dot33rpm 08:05:29 03/08/24 (2)
        • RE: Futterman H-3 restoration frequency response - 33dot33rpm 08:12:58 03/08/24 (1)
          • RE: Futterman H-3 restoration frequency response - rogerh113 06:55:03 03/09/24 (0)
  • RE: Futterman H-3 restoration - AJ 05:49:52 03/06/24 (3)
    • RE: Futterman H-3 restoration - 33dot33rpm 17:46:40 03/06/24 (2)
      • RE: Futterman H-3 restoration - AJ 18:42:41 03/06/24 (1)
        • RE: Futterman H-3 restoration - 33dot33rpm 08:39:48 03/07/24 (0)
  • RE: Futterman H-3 restoration - rogerh113 07:35:52 03/05/24 (10)
    • RE: Futterman H-3 restoration - 33dot33rpm 09:32:13 03/05/24 (9)
      • May I suggest a NTC thermistor on the primary? - garymuffley 09:40:48 03/06/24 (1)
        • RE: May I suggest a NTC thermistor on the primary? - 33dot33rpm 17:30:25 03/06/24 (0)
      • RE: Futterman H-3 restoration - rogerh113 09:52:52 03/05/24 (6)
        • RE: Futterman H-3 restoration - 33dot33rpm 12:04:53 03/05/24 (5)
          • RE: Futterman H-3 restoration - rogerh113 14:19:07 03/05/24 (0)
          • RE: Futterman H-3 restoration - rogerh113 14:09:18 03/05/24 (0)
          • RE: Futterman H-3 restoration - rogerh113 14:05:21 03/05/24 (2)
            • RE: Futterman H-3 restoration - 33dot33rpm 08:43:29 03/07/24 (1)
              • RE: Futterman H-3 restoration - rogerh113 09:14:12 03/07/24 (0)
• Transcendent Sound OTL - Tube747 17:34:38 01/18/24 (4)
  • RE: Transcendent Sound OTL - ltman 10:51:58 01/24/24 (2)
    • RE: Transcendent Sound OTL - airheadair 13:11:32 03/21/24 (1)
      • RE: Transcendent Sound OTL - ltman 13:44:26 03/21/24 (0)
  • A minor point :) - Ralph 11:39:20 01/23/24 (0)
• 6AS7G/6N13S sound quality & longevity ?'s - tsully1@att.net 08:37:12 01/14/24 (6)
  • RE: 6AS7G/6N13S sound quality & longevity ?'s - tsully1@att.net 18:30:52 01/16/24 (0)
  • RE: 6AS7G/6N13S sound quality & longevity ?'s - tsully1@att.net 09:48:28 01/16/24 (1)
    • loss of transconductance - Ralph 14:06:18 01/16/24 (0)
  • RE: 6AS7G/6N13S sound quality & longevity ?'s - cellailuca 02:23:43 01/16/24 (0)
  • The Chinese and Russian power tubes sound similar, - Ralph 07:53:11 01/15/24 (1)
    • RE: Been running M60s for 20 years - acres verde 11:16:38 01/15/24 (0)
• OTL vs. Class D? - ltman 10:09:03 12/31/23 (6)
  • RE: OTL vs. Class D? - airheadair 11:40:43 01/06/24 (1)
    • RE: OTL vs. Class D? - Ralph 11:59:08 01/09/24 (0)
  • RE: OTL vs. Class D? Not as simple as that! - Ralph 09:53:46 01/03/24 (1)
    • RE: OTL vs. Class D? Not as simple as that! - ltman 15:10:38 01/12/24 (0)
  • RE: OTL vs. Class D? - Lew 08:49:27 01/02/24 (1)
    • RE: OTL vs. Class D? - ltman 19:28:54 01/02/24 (0)
• Excessive DC offset on MP1 - Lew 09:57:21 12/22/23 (14)
  • The MP-1 and MP-3 servo system - Ralph 10:49:36 12/22/23 (12)
    • Ralph, I sent you a PM - Lew 09:54:20 01/02/24 (0)
    • RE: The MP-1 and MP-3 servo system - Lew 13:21:39 12/22/23 (10)
      • RE: The MP-1 and MP-3 servo system - MLin 08:05:19 12/24/23 (9)
        • RE: The MP-1 and MP-3 servo system - Lew 15:14:19 12/24/23 (8)
          • RE: The MP-1 and MP-3 servo system - MLin 18:52:28 12/24/23 (7)
            • RE: The MP-1 and MP-3 servo system - Lew 09:52:27 12/25/23 (6)
              • RE: The MP-1 and MP-3 servo system - MLin 13:17:31 12/25/23 (5)
                • RE: The MP-1 and MP-3 servo system - Lew 14:54:34 12/25/23 (4)
                  • RE: The MP-1 and MP-3 servo system - MLin 18:02:54 12/25/23 (3)
                    • RE: The MP-1 and MP-3 servo system - Lew 18:22:58 12/25/23 (2)
                      • RE: The MP-1 and MP-3 servo system - MLin 12:26:00 12/26/23 (1)
                        • RE: The MP-1 and MP-3 servo system - Lew 12:43:28 12/27/23 (0)
  • I guess I should add.... - Lew 10:05:41 12/22/23 (0)
• Bringing up Futterman H3 with OA2 and 5651 tubes ??? - rogerh113 15:35:28 12/19/23 (6)
  • RE: Bringing up Futterman H3 with OA2 and 5651 tubes ??? - 33dot33rpm 13:52:14 12/21/23 (1)
    • RE: Bringing up Futterman H3 with OA2 and 5651 tubes ??? - rogerh113 14:56:31 12/21/23 (0)
  • If you don't have a variac - Ralph 09:48:28 12/21/23 (1)
    • RE: If you don't have a variac - rogerh113 09:58:52 12/21/23 (0)
  • RE: Bringing up Futterman H3 with OA2 and 5651 tubes ??? - 6bq5 10:12:55 12/20/23 (1)
    • RE: Bringing up Futterman H3 with OA2 and 5651 tubes ??? - rogerh113 16:19:04 12/20/23 (0)
• Question on biasing MA-1 with DMM - MLin 20:23:07 12/07/23 (17)
  • RE: Question on biasing MA-1 with DMM - Lew 20:03:35 12/09/23 (16)
    • RE: Question on biasing MA-1 with DMM - MLin 21:07:24 12/09/23 (15)
      • RE: How to set the bias with a DMM - Ralph 11:15:45 12/14/23 (1)
        • RE: How to set the bias with a DMM - MLin 18:35:33 12/14/23 (0)
      • RE: Question on biasing MA-1 with DMM - Lew 16:10:15 12/10/23 (12)
        • RE: Question on biasing MA-1 with DMM - MLin 17:47:16 12/10/23 (11)
          • My 6C33C amplifiers were otherwise known as "MA240" - Lew 12:01:51 12/13/23 (10)
            • RE: My 6C33C amplifiers were otherwise known as "MA240" - MLin 19:02:20 12/14/23 (9)
              • Don't bother.... - Lew 12:51:14 12/16/23 (8)
                • RE: Don't bother.... - MLin 07:18:22 12/17/23 (7)
                  • RE: Don't bother.... - MLin 07:23:15 12/17/23 (6)
                    • Yep.. - Lew 09:08:17 12/17/23 (5)
                      • RE: Yep.. - MLin 13:49:07 12/17/23 (4)
                        • 5692 - Lew 20:02:32 12/18/23 (2)
                          • RE: 5692 - MLin 21:38:01 12/18/23 (1)
                            • RE: 5692 - Lew 19:02:30 12/19/23 (0)
                        • Sockets don't cause microphonics. - Ralph 10:32:02 12/18/23 (0)
• My 2008 DIY OTL - cellailuca 10:58:44 11/16/23 (2)
  • RE: feedback suggestion - Ralph 09:59:26 11/22/23 (1)
    • RE: feedback suggestion - cellailuca 10:11:43 11/24/23 (0)
• M-60's with DeVore Speakers - rclanger 08:20:42 11/14/23 (3)
  • RE: M-60's with DeVore Speakers - 6bq5 09:51:27 11/15/23 (2)
    • RE: M-60's with DeVore Speakers - rclanger 16:20:31 11/15/23 (1)
      • RE: M-60's with DeVore Speakers - Ralph 12:25:41 11/21/23 (0)
• Luxman MQ-36 repair - pennyford 07:14:30 11/13/23 (2)
  • 'Dead' is usually easier to fix. - Ralph 08:50:18 11/13/23 (1)
    • RE: 'Dead' is usually easier to fix. - 6bq5 14:43:01 11/14/23 (0)
• Questions about speaker cable characteristic impedance - MP 11:56:15 10/02/23 (11)
  • RE: Questions about speaker cable characteristic impedance - grindstone 08:24:03 10/10/23 (0)
  • RE: Questions about speaker cable characteristic impedance - Ralph 09:40:34 10/04/23 (5)
    • RE: Questions about speaker cable characteristic impedance - MP 11:13:00 10/04/23 (4)
      • RE: No. It should be the same nt - Ralph 11:14:55 10/04/23 (3)
        • But no speaker has a constant impedance at all frequencies, ... - Lew 07:58:59 11/18/23 (1)
          • Yes- part of the reason no speaker cable will be perfect... nt - Ralph 11:46:38 11/18/23 (0)
        • RE: Thank you. Understand now. NT - MP 15:37:36 10/04/23 (0)
  • RE: Questions about speaker cable characteristic impedance - 6bq5 14:50:36 10/02/23 (3)
    • RE: Questions about speaker cable characteristic impedance - MP 16:42:43 10/03/23 (2)
      • I still use Goertz silver ribbons - Lew 08:03:25 11/18/23 (1)
        • RE: I still use Goertz silver ribbons - MP 06:10:45 01/02/24 (0)
• What is the function of V3 (CCS tube) in Silver Edition MK3.3 - MP 06:53:39 09/09/23 (4)
  • RE: What is the function of V3 (CCS tube) in Silver Edition MK3.3 - Ralph 08:55:48 09/11/23 (3)
    • RE: Thank you so much for the clarification, Ralph. V3--)V1 - MP 13:38:01 09/11/23 (2)
      • RE: Thank you so much for the clarification, Ralph. V3--)V1 - Ralph 13:52:51 09/11/23 (1)
        • RE: understand now. Thank you. Ralph. NT - MP 20:17:39 09/11/23 (0)
• MA-1 standby and tube life - Ogh 05:01:55 08/18/23 (5)
  • RE: The greater amount of power is consumed when the amps are full on - Ralph 10:04:33 08/18/23 (4)
    • RE: The greater amount of power is consumed when the amps are full on - Ogh 21:50:30 08/18/23 (3)
      • RE: The greater amount of power is consumed when the amps are full on - pictureguy 22:38:03 08/18/23 (2)
        • Other than drawing power, I don't think this would win you anything - Ralph 10:23:26 08/25/23 (0)
        • RE: The greater amount of power is consumed when the amps are full on - Ogh 23:14:57 08/18/23 (0)
• Luxman MQ-36 - Joe Backer 13:15:47 08/11/23 (6)
  • RE: Luxman MQ-36 - rogerh113 07:22:14 08/12/23 (3)
    • RE: Luxman MQ-36 - Joe Backer 09:30:52 08/12/23 (2)
      • RE: Luxman MQ-36 - rogerh113 09:54:56 08/12/23 (1)
        • RE: Luxman MQ-36 - Joe Backer 14:49:17 08/12/23 (0)
  • RE: Luxman MQ-36 (A little forward sounding?) - Joe Backer 18:53:46 08/11/23 (1)
    • RE: Luxman MQ-36 (A little forward sounding?) - Joe Backer 17:54:21 08/14/23 (0)
• Croft Series X info - bcarlos 06:18:07 07/17/23 (21)
  • RE: Croft Series X info - rogerh113 07:10:11 07/18/23 (19)
    • RE: Croft Series X info - bcarlos 07:43:33 07/18/23 (18)
      • Could you post a photo of the rear panel? - Ralph 14:33:08 07/19/23 (5)
        • RE: Could you post a photo of the rear panel? - bcarlos 16:07:25 07/19/23 (4)
          • Thanks. - Ralph 11:22:40 07/20/23 (2)
            • RE: Thanks. - bcarlos 14:54:19 07/20/23 (1)
              • RE: It won't hurt to try a 12AT7 - Ralph 08:13:05 07/21/23 (0)
          • RE: Could you post a photo of the rear panel? - bcarlos 16:09:16 07/19/23 (0)
      • RE: Croft Series X info - rogerh113 08:40:56 07/18/23 (9)
        • RE: Croft Series X info - bcarlos 10:09:26 07/18/23 (8)
          • Based on the information you have - Ralph 14:26:10 07/19/23 (1)
            • RE: Based on the information you have - bcarlos 16:04:01 07/19/23 (0)
          • RE: Croft Series X info - rogerh113 11:57:14 07/18/23 (0)
          • RE: Croft Series X info - bcarlos 10:35:02 07/18/23 (4)
            • RE: Croft Series X info - rogerh113 06:53:24 07/19/23 (2)
              • RE: Croft Series X info - bcarlos 16:15:06 07/19/23 (1)
                • RE: Croft Series X info - rogerh113 18:09:18 07/19/23 (0)
            • The 6AS7 and 6080 are very similar nt - Ralph 11:23:58 07/18/23 (0)
      • RE: Croft Series X info - bcarlos 07:46:27 07/18/23 (1)
        • RE: Croft Series X info - bcarlos 07:50:29 07/18/23 (0)
  • RE: Croft Series X info - 6bq5 11:13:28 07/17/23 (0)
• otl amps/speakers and zoebel networks - lotsmorebetter1 18:44:01 05/08/23 (8)
  • You may not have an output coupling cap- many OTLs don't. - Ralph 10:27:02 05/11/23 (7)
    • RE: You may not have an output coupling cap- many OTLs don't. - lotsmorebetter1 14:17:30 05/11/23 (6)
      • RE: You may not have an output coupling cap- many OTLs don't. - lotsmorebetter1 10:32:18 05/12/23 (4)
        • This really sounds like a crossover issue; here's something to consider - Ralph 10:47:27 05/12/23 (2)
          • RE: This really sounds like a crossover issue; here's something to consider - lotsmorebetter1 13:36:11 05/12/23 (1)
            • You'd really have to build and measure it - Ralph 13:56:11 05/12/23 (0)
        • RE: You may not have an output coupling cap- many OTLs don't. - lotsmorebetter1 10:33:40 05/12/23 (0)
      • That's correct. - Ralph 09:03:52 05/12/23 (0)
• Beveridge OTL amps - AJ 18:33:06 03/28/23 (4)
  • RE: Beveridge OTL amps - Lew 14:15:41 12/07/23 (0)
  • RE: Beveridge OTL amps - AJ 18:41:40 03/31/23 (0)
  • RE: Beveridge OTL amps - rhinohifi714 15:52:42 03/31/23 (1)
    • RE: Beveridge OTL amps - AJ 18:43:41 03/31/23 (0)
• New 6SN7's in my Atma-Sphere Gear! - rclanger 09:30:41 03/19/23 (2)
  • My vote is in the preamp- the further upstream the better nt - Ralph 08:36:36 03/22/23 (1)
    • RE: My vote is in the preamp- the further upstream the better nt - rclanger 18:45:36 03/23/23 (0)
• Tube Rolling an MP1 3.3 - Simon Templar 23:25:57 02/21/23 (5)
  • MP-1 Mk3.3 most important tube positions. - Ralph 13:10:57 02/22/23 (2)
    • RE: MP-1 Mk3.3 most important tube positions. - Simon Templar 22:47:09 03/04/23 (1)
      • No- what is important is that the tube actually be good and tests strong nt - Ralph 14:55:13 03/07/23 (0)
  • That's an MA-1 v. 3.3? If so, the 1st-stage Voltage-gain tubes... - jeffreybehr 12:21:40 02/22/23 (1)
    • OOPS--wrong piece. (NT) - jeffreybehr 12:17:44 02/26/23 (0)
• I'm in for a big hurting.... - AJ 18:31:05 02/06/23 (9)
  • RE: I'm in for a big hurting.... - 6bq5 14:20:19 02/11/23 (1)
    • RE: I'm in for a big hurting.... - AJ 04:52:01 02/12/23 (0)
  • Dust can be a major factor when dealing with high voltages - Ralph 12:21:45 02/09/23 (1)
    • RE: Dust can be a major factor when dealing with high voltages - AJ 17:10:37 02/09/23 (0)
  • RE: I'm in for a big hurting.... - rogerh113 04:14:52 02/07/23 (4)
    • RE: I'm in for a big hurting.... - Baranyi 08:15:03 02/25/23 (3)
      • RE: I'm in for a big hurting.... - AJ 04:26:24 02/27/23 (2)
        • RE: I'm in for a big hurting.... - Baranyi 16:34:50 03/01/23 (1)
          • RE: I'm in for a big hurting.... - AJ 19:11:37 03/01/23 (0)
• 6AS7G tube testing settings and readings - johnax1 11:29:34 02/03/23 (2)
  • 120-140Volts should get you in the ballpark. - Ralph 12:17:29 02/09/23 (1)
    • RE: 120-140Volts should get you in the ballpark. - johnax 12:29:29 02/12/23 (0)
• Delayed distortion - LtMandella 20:47:17 01/30/23 (6)
  • I think this is a power supply problem. - Ralph 09:00:38 02/01/23 (1)
    • RE: I think this is a power supply problem. - LtMandella 11:37:16 02/01/23 (0)
  • RE: Delayed distortion - rhinohifi714 11:05:02 01/31/23 (3)
    • RE: Delayed distortion - LtMandella 11:09:05 01/31/23 (2)
      • RE: Delayed distortion - Chip647 07:38:00 02/01/23 (1)
        • RE: Delayed distortion - LtMandella 08:05:25 02/01/23 (0)
• My 2008 OTL - cellailuca 08:22:07 01/26/23 (2)
  • A possible update - Ralph 14:24:46 01/27/23 (1)
    • RE: A possible update - cellailuca 09:18:03 01/28/23 (0)
• Einstein Silver Bullets for sale if interested - Charlie8521 04:36:15 12/20/22 (1)
  • Seems like so little love for my post that maybe ... - Charlie8521 08:29:28 01/13/23 (0)
• MP3 phono cascode mod - MP 03:52:37 12/14/22 (10)
  • Does factory have jumper/adapter for purchase? Yes. nt - Ralph 12:43:45 12/16/22 (8)
    • RE: Thank you, Ralph. New setup with SUT - MP 07:54:33 12/20/22 (7)
      • Variables - Ralph 09:38:34 12/20/22 (6)
        • RE: Variables - MP 10:16:35 12/20/22 (5)
          • RE: Variables - Ralph 10:19:08 12/20/22 (4)
            • RE: Variables - MP 11:14:00 12/20/22 (3)
              • RE: Variables - Ralph 11:26:45 12/20/22 (2)
                • RE: Variables - MP 04:30:19 05/05/23 (0)
                • RE: Ralph, thank you. Very informative. NT - MP 13:33:11 12/20/22 (0)
  • RE: MP3 phono cascode mod - MP 08:02:01 12/16/22 (0)
• BEST-EVER-sounding music system this WE - jeffreybehr 15:03:01 11/28/22 (14)
  • RE: BEST-EVER-sounding music system this WE - bk12 15:21:25 12/29/22 (1)
    • This pair was YOURS?!?! (NT) - jeffreybehr 21:26:50 12/29/22 (0)
  • RE: BEST-EVER-sounding music system this WE - acres verde 10:16:50 11/29/22 (11)
    • Certainly of the 4 30-to-60-Watt SETs I tried... - jeffreybehr 15:58:06 11/29/22 (10)
      • RE: Certainly of the 4 30-to-60-Watt SETs I tried... - cellailuca 03:31:25 12/06/22 (1)
        • RE: Certainly of the 4 30-to-60-Watt SETs I tried... - Retsel 09:18:01 04/02/23 (0)
      • RE: Certainly of the 4 30-to-60-Watt SETs I tried... - acres verde 07:36:39 11/30/22 (7)
        • HHR TLS-2s, a Walsh-type full-range system. - jeffreybehr 11:53:10 11/30/22 (6)
          • RE: HHR TLS-2s, a Walsh-type full-range system. - Sibelius 12:41:37 11/30/22 (5)
            • omni directional speakers always measure less than their real efficiency. - Ralph 14:17:32 12/01/22 (2)
              • TY, Ralph.. We'll hear them next week in my musicroom. - jeffreybehr 10:21:28 12/02/22 (1)
                • Here we are 3 days AFTER 'next week' and still no word... - jeffreybehr 11:22:20 12/12/22 (0)
            • Don't know; maybe Dale listens at higher levels or... - jeffreybehr 16:33:02 11/30/22 (1)
              • These several comments on speaker sensitivity, listening levels... - jeffreybehr 11:25:20 12/12/22 (0)
• Received my (lifetime-3rd) pair of A-S M-60s yesterday. - jeffreybehr 13:56:56 07/23/22 (6)
  • RE: Received my (lifetime-3rd) pair of A-S M-60s yesterday. - acres verde 08:41:54 07/27/22 (5)
    • RE: Received my (lifetime-3rd) pair of A-S M-60s yesterday. - airheadair 20:28:54 07/27/22 (4)
      • I was curious about that too but apparently it works alright according to Jeffery nt - Ralph 10:01:34 07/29/22 (0)
      • Sorry, I can't help you with that... - acres verde 15:13:08 07/28/22 (2)
        • RE: Sorry, I can't help you with that... - airheadair 10:26:11 07/30/22 (1)
          • Nope... - acres verde 13:39:13 07/30/22 (0)
• how my otl day went today - rhinohifi714 17:23:40 06/13/22 (10)
  • Mine went very well, TY for asking. - jeffreybehr 13:19:07 11/19/22 (0)
  • RE: OTL this morning - LtMandella 08:08:09 11/12/22 (0)
  • Mine certainly went well--I bought a used pair of A-S M-60s... - jeffreybehr 20:11:16 07/17/22 (0)
  • RE: how my otl day went today - rogerh113 06:57:02 06/14/22 (5)
    • RE: how my otl day went today - rogerh113 15:34:44 09/04/22 (3)
      • RE: how my otl day went today - rhinohifi714 14:32:29 09/06/22 (2)
        • RE: how my otl day went today - rogerh113 14:42:42 09/06/22 (1)
          • RE: how my otl day went today - rogerh113 07:47:54 11/11/22 (0)
    • RE: how my otl day went today - rhinohifi714 08:42:14 06/16/22 (0)
  • RE: how my otl day went today - rhinohifi714 17:58:01 06/13/22 (0)
• rogerh113 - The Bored 19:04:12 05/23/22 (1)
  • RE: rogerh113 - rogerh113 20:23:52 06/10/22 (0)
• PS audio Stellar vs MP3 Phono - MP 05:43:14 05/22/22 (7)
  • You can use the JT-347 with the Ruby no worries. - Ralph 13:22:56 05/23/22 (6)
    • RE: You can use the JT-347 with the Ruby no worries. - MP 18:15:21 05/23/22 (5)
      • RE: You can use the JT-347 with the Ruby no worries. - rclanger 11:33:59 05/24/22 (1)
        • RE: You can use the JT-347 with the Ruby no worries. - MP 15:37:43 05/24/22 (0)
      • RE: The cartridge isn't going to care about the load. - Ralph 09:03:40 05/24/22 (2)
        • RE: The cartridge isn't going to care about the load. - MP 07:32:34 12/31/22 (0)
        • RE: The cartridge isn't going to care about the load. - MP 15:37:13 05/24/22 (0)
• Threads keep disappearing ??? - rogerh113 06:56:20 05/19/22 (0)
• Futterman H-3 - AJ 10:03:27 03/25/22 (5)
  • RE: Futterman H-3 - rogerh113 08:27:28 03/26/22 (2)
    • RE: Futterman H-3 - rhinohifi714 21:59:58 05/17/22 (1)
      • RE: Futterman H-3 - Mike Mount 11:01:03 05/23/22 (0)
  • RE: Futterman H-3 - AJ 16:48:47 03/25/22 (0)
  • RE: Futterman H-3 - Lew 13:28:09 03/25/22 (0)
• Futterman OTL 3 power supply trafo - audiodan@tiscali.it 01:43:33 01/18/22 (10)
  • RE: Futterman OTL 3 power supply trafo - airheadair 21:43:45 01/19/22 (9)
    • RE: Futterman OTL 3 power supply trafo - rhinohifi714 19:14:35 03/04/22 (3)
      • RE: Futterman OTL 3 power supply trafo - airheadair 21:58:04 03/05/22 (2)
        • RE: Futterman OTL 3 power supply trafo - rhinohifi714 13:23:37 03/07/22 (1)
          • RE: Futterman OTL 3 power supply trafo - airheadair 21:45:02 03/08/22 (0)
    • RE: Futterman OTL 3 power supply trafo - audiodan@tiscali.it 12:21:18 01/20/22 (4)
      • RE: Futterman OTL 3 power supply trafo - rhinohifi714 10:10:33 02/09/22 (2)
        • RE: Futterman OTL 3 power supply trafo - rhinohifi714 10:17:35 02/09/22 (1)
          • RE: Futterman OTL 3 power supply trafo - audiodan@tiscali.it 08:14:42 03/09/22 (0)
      • How readable is your schematic? - Ralph 14:39:26 01/21/22 (0)
• Futterman OTL 3 power supply trafo - audiodan@tiscali.it 11:59:22 01/17/22 (0)
• Connecting tube amp to sub with speaker level inputs - LtMandella 13:56:23 01/13/22 (9)
  • RE: Connecting tube amp to sub with speaker level inputs - Bill Way 07:33:34 01/14/22 (8)
    • RE: Connecting tube amp to sub with speaker level inputs - LtMandella 09:31:02 01/14/22 (7)
      • RE: Connecting tube amp to sub with speaker level inputs - Bill Way 10:00:32 01/14/22 (6)
        • RE: Connecting tube amp to sub with speaker level inputs - LtMandella 13:08:25 01/15/22 (5)
          • It should be safe with almost any OTL - Ralph 08:41:37 01/18/22 (4)
            • RE: It should be safe with almost any OTL - MP 08:01:59 01/23/22 (0)
            • RE: It should be safe with almost any OTL - LtMandella 08:53:11 01/18/22 (2)
              • Its not balanced; you should be OK. nt - Ralph 10:18:58 01/18/22 (1)
                • RE: Its not balanced; you should be OK. nt - LtMandella 11:08:33 01/18/22 (0)
• Why aren't OTL tube amps more popular? - LtMandella 10:16:42 12/31/21 (8)
  • several reasons - Ralph 11:42:23 01/03/22 (0)
  • RE: Why aren't OTL tube amps more popular? - 6bq5 09:43:01 01/01/22 (6)
    • RE: Why aren't OTL tube amps more popular? - Lew 10:19:10 01/04/22 (5)
      • RE: Isn't the Transcendent circuit basically a modified Futterman? - LtMandella 11:06:23 01/13/22 (0)
      • RE: Why aren't OTL tube amps more popular? - airheadair 21:42:30 01/04/22 (0)
      • RE: Why aren't OTL tube amps more popular? - Ralph 14:36:10 01/04/22 (2)
        • RE: Why aren't OTL tube amps more popular? - clio09 17:08:31 01/27/22 (1)
          • RE: Why aren't OTL tube amps more popular? - airheadair 21:38:38 01/27/22 (0)
• Tip for ESL fanatics - Lew 08:55:14 11/19/21 (19)
  • RE: Tip for ESL fanatics - LtMandella 08:48:25 12/05/21 (2)
    • RE: Tip for ESL fanatics - Lew 16:00:57 12/05/21 (1)
      • RE: Tip for ESL fanatics - LtMandella 16:20:49 12/05/21 (0)
  • OTL looks a bit different... - cellailuca 03:47:56 11/26/21 (1)
    • RE: OTL looks a bit different... - Lew 09:27:48 11/26/21 (0)
  • clean power anyone? - Story 02:37:45 11/24/21 (1)
    • RE: clean power anyone? - Lew 08:59:02 11/24/21 (0)
  • RE: Tip for ESL fanatics - pictureguy 21:10:49 11/23/21 (5)
    • RE: Tip for ESL fanatics - Lew 06:18:11 11/24/21 (4)
      • RE: Tip for ESL fanatics - pictureguy 10:21:15 11/24/21 (3)
        • RE: Tip for ESL fanatics - Lew 14:05:32 11/24/21 (2)
          • RE: Tip for ESL fanatics - voolston 14:46:17 12/03/21 (0)
          • RE: Tip for ESL fanatics - pictureguy 14:16:44 11/24/21 (0)
  • Couldn't you get the same effect with regulated high voltage supplies - Ralph 14:33:16 11/22/21 (1)
    • RE: Couldn't you get the same effect with regulated high voltage supplies - Lew 20:52:53 11/23/21 (0)
  • RE: Tip for ESL fanatics - ACHiPo 19:59:06 11/20/21 (3)
    • RE: Tip for ESL fanatics - Lew 06:11:09 11/21/21 (2)
      • RE: Tip for ESL fanatics - ACHiPo 14:09:52 11/21/21 (1)
        • RE: Tip for ESL fanatics - ACHiPo 14:29:01 01/16/22 (0)
• CJ PV11 problem in phono - RBS 11:54:57 11/16/21 (5)
  • RE: CJ PV11 problem in phono - Ralph 14:30:53 11/22/21 (2)
    • RE: CJ PV11 problem in phono - RBS 14:43:44 11/22/21 (1)
      • Look for the plate resistors- one side is the power supply nt - Ralph 14:53:43 11/22/21 (0)
  • RE: CJ PV11 problem in phono - rogerh113 06:12:31 11/17/21 (1)
    • RE: CJ PV11 problem in phono - RBS 14:41:47 11/22/21 (0)
• Should I bother to put a fan on my T8-LN OTL power tubes? - LtMandella 13:38:04 10/30/21 (5)
  • Or... - Lew 07:35:22 11/05/21 (0)
  • RE: Should I bother to put a fan on my T8-LN OTL power tubes? - Bill Way 11:08:24 11/02/21 (1)
    • I decided to use this - LtMandella 11:28:23 11/02/21 (0)
  • RE: Should I bother to put a fan on my T8-LN OTL power tubes? - 6bq5 14:59:46 10/30/21 (1)
    • RE: Should I bother to put a fan on my T8-LN OTL power tubes? - LtMandella 15:47:40 10/30/21 (0)
• Do V1a and V1b 6SN7s on M-60 MK3.3 need to be matched? - MP 17:36:08 10/03/21 (4)
  • No, but it won't hurt :) nt - Ralph 10:27:34 10/04/21 (3)
    • RE: Thank you, Ralph. Could 5692 be used in V1 or V2? - MP 17:16:51 10/04/21 (2)
      • Yes. Do not use them in the V4 (driver tube) position. nt - Ralph 10:35:26 10/05/21 (1)
        • RE: Yes. Do not use them in the V4 (driver tube) position. nt - MP 17:12:37 10/05/21 (0)
• Phono Stage New Capacitors Break-in - MP 17:06:26 09/30/21 (3)
  • I just bought one of these... - 1973shovel 20:58:56 10/01/21 (2)
    • RE: I just bought one of these... - MP 08:59:48 10/02/21 (1)
      • You're welcome (nt) - 1973shovel 09:57:04 10/03/21 (0)
• Atma-Sphere MA-1 Burn-In Process - ACHiPo 17:51:49 09/28/21 (14)
  • Burn-In Process - Ralph 10:58:09 09/29/21 (1)
    • RE: Burn-In Process - ACHiPo 11:16:23 09/29/21 (0)
  • RE: Atma-Sphere MA-1 Burn-In Process--72 hr update - ACHiPo 08:44:19 09/29/21 (11)
    • RE: Atma-Sphere MA-1 Burn-In Process--96 hr update - ACHiPo 06:49:31 09/30/21 (10)
      • RE: Atma-Sphere MA-1 Burn-In Process--120 hr update - ACHiPo 07:48:46 10/01/21 (9)
        • RE: Atma-Sphere MA-1 Burn-In Process--120 hr update - MRMB 15:15:33 10/01/21 (8)
          • RE: Atma-Sphere MA-1 Burn-In Process--120 hr update - ACHiPo 20:30:41 10/01/21 (7)
            • RE: Atma-Sphere MA-1 Burn-In Process--130 hr update - ACHiPo 08:22:38 10/04/21 (6)
              • Calling it Quits at ~150 hours - ACHiPo 11:01:24 10/05/21 (5)
                • RE: Calling it Quits at ~150 hours - ACHiPo 22:00:55 10/23/21 (4)
                  • RE: Calling it Quits at ~150 hours - ACHiPo 08:40:43 10/24/21 (3)
                    • RE: Calling it Quits at ~150 hours - Lew 09:41:47 11/10/21 (2)
                      • RE: Calling it Quits at ~150 hours - ACHiPo 11:21:02 11/10/21 (1)
                        • Tube inflation - Lew 10:31:20 11/14/21 (0)
• New 6SN7 Alternative for AtmaSphere Driver? - ACHiPo 20:35:51 09/24/21 (4)
  • RE: New 6SN7 Alternative for AtmaSphere Driver? - Ralph 12:57:06 09/27/21 (3)
    • RE: New 6SN7 Alternative for AtmaSphere Driver? - MRMB 15:31:12 10/01/21 (0)
    • RE: New 6SN7 Alternative for AtmaSphere Driver? - David M. 14:02:30 09/28/21 (0)
    • RE: New 6SN7 Alternative for AtmaSphere Driver? - ACHiPo 14:05:52 09/27/21 (0)
• AtmaSphere MA1 Circuit Amperage? - ACHiPo 20:12:38 09/22/21 (3)
  • RE: AtmaSphere MA1 Circuit Amperage? - ACHiPo 19:21:11 09/23/21 (2)
    • Check the fuse size - Lew 18:54:47 10/24/21 (1)
      • RE: Check the fuse size - ACHiPo 19:51:28 10/24/21 (0)
• Fourier Panthers Inquiring About Reliability And History - Mister Pig 20:51:55 08/29/21 (15)
  • RE: Fourier Panthers Inquiring About Reliability And History - rhinohifi714 08:58:46 08/31/21 (4)
    • RE: Fourier Panthers Inquiring About Reliability And History - Ralph 14:20:33 09/01/21 (3)
      • RE: Fourier Panthers Inquiring About Reliability And History - Lew 09:01:47 11/19/21 (0)
      • There seems to be some confusion regarding the difference between circuit design and parts selection. Nt - viridian 14:39:55 09/01/21 (1)
        • Exactly nt - Ralph 14:41:48 09/01/21 (0)
  • RE: Fourier Panthers Inquiring About Reliability And History - Mister Pig 06:25:07 08/30/21 (9)
    • Fourier and Futterman - Lew 08:50:24 11/19/21 (1)
      • RE: Fourier and Futterman - lucisfero1 14:26:58 10/08/22 (0)
    • RE: Yay! good work on your part nt - Ralph 10:48:29 08/30/21 (6)
      • RE: Yay! good work on your part nt - airheadair 12:49:06 08/30/21 (5)
        • This really isn't isn't about Futterman amps - Ralph 13:35:24 08/30/21 (4)
          • RE: This really isn't isn't about Futterman amps - airheadair 14:01:08 08/30/21 (3)
            • RE: This really isn't isn't about Futterman amps - Ralph 14:55:57 08/30/21 (2)
              • RE: This really isn't isn't about Futterman amps - garymuffley 16:40:53 08/30/21 (1)
                • RE: This really isn't isn't about Futterman amps - Ralph 09:24:17 08/31/21 (0)
• NOS AS7s in MA-1s? - ACHiPo 11:38:07 07/23/21 (7)
  • Be careful of American 6AS7s - Ralph 12:20:10 08/09/21 (1)
    • RE: Be careful of American 6AS7s - ACHiPo 12:33:11 08/09/21 (0)
  • RE: NOS AS7s in MA-1s? - ACHiPo 10:31:05 07/27/21 (3)
    • RE: NOS AS7s in MA-1s? - voolston 15:53:38 07/28/21 (2)
      • RE: NOS AS7s in MA-1s? - ACHiPo 15:59:04 07/28/21 (1)
        • RE: NOS AS7s in MA-1s? - voolston 06:57:20 07/29/21 (0)
  • RE: NOS AS7s in MA-1s? - ACHiPo 11:38:47 07/23/21 (0)
• Atma-Sphere MA-1s Incoming - ACHiPo 14:22:50 07/22/21 (16)
  • RE: Atma-Sphere MA-1s are Here! - ACHiPo 17:45:34 09/25/21 (0)
  • RE: You aced the test... - acres verde 10:15:13 07/23/21 (14)
    • RE: You aced the test... - ACHiPo 10:21:28 07/23/21 (13)
      • RE: You aced the test... - acres verde 11:16:35 07/23/21 (12)
        • RE: You aced the test... - ACHiPo 11:31:46 07/23/21 (11)
          • RE: You aced the test... - MRMB 16:00:38 08/02/21 (3)
            • RE: You aced the test... - ACHiPo 16:54:54 08/02/21 (2)
              • RE: You aced the test... - MRMB 18:47:41 08/02/21 (1)
                • RE: You aced the test... - ACHiPo 19:05:19 08/02/21 (0)
          • RE: You aced the test... - acres verde 11:46:55 07/23/21 (6)
            • RE: You aced the test... - ACHiPo 12:12:48 07/23/21 (5)
              • Stay away from any 6AS7GA - Ralph 12:11:03 08/09/21 (1)
                • RE: Stay away from any 6AS7GA - ACHiPo 12:21:55 08/09/21 (0)
              • RE: You aced the test... - acres verde 13:31:34 07/23/21 (2)
                • RE: You aced the test... - marc g. 11:50:59 07/26/21 (1)
                  • RE: You aced the test... - acres verde 12:55:11 07/26/21 (0)
• Phono Step-up Transformer - throwback 16:42:24 07/15/21 (7)
  • Whatever stepup you get - Ralph 11:14:22 07/16/21 (1)
    • RE: Whatever stepup you get - throwback 14:40:50 07/16/21 (0)
  • RE: Phono Step-up Transformer - Elixir63 21:33:25 07/15/21 (4)
    • RE: Phono Step-up Transformer - throwback 05:33:27 07/16/21 (3)
      • RE: Phono Step-up Transformer - Elixir63 08:52:51 07/16/21 (2)
        • RE: Phono Step-up Transformer - Ralph 15:12:57 07/16/21 (0)
        • RE: Phono Step-up Transformer - throwback 14:30:24 07/16/21 (0)
• Dickie - Macovski OTL amplifier - sprussog 22:10:22 07/10/21 (3)
  • RE: Dickie - Macovski OTL amplifier - cellailuca 09:46:37 11/17/21 (0)
  • RE: Dickie - Macovski OTL amplifier - cpotl 16:08:05 08/26/21 (0)
  • RE: Dickie - Macovski OTL amplifier - acres verde 11:04:16 07/11/21 (0)
• old antenna switch from 1928 - sprussog 10:28:04 07/10/21 (1)
  • RE: old antenna switch from 1928 - 6bq5 12:50:45 07/13/21 (0)
• LTAs Linear Tube Audio with Sound Lab ? - Mr. Efforty 12:29:46 05/10/21 (3)
  • RE: LTAs Linear Tube Audio with Sound Lab ? - bk12 19:09:21 05/24/21 (0)
  • RE: A little shy on power - Ralph 12:36:56 05/12/21 (0)
  • RE: LTAs Linear Tube Audio with Sound Lab ? - MRMB 21:11:34 05/10/21 (0)
• Atma Question - Alsatian 08:59:43 04/14/21 (14)
  • RE: The impedance does not have to be flat. - Ralph 10:50:08 04/14/21 (13)
    • RE: The impedance does not have to be flat. - Simon Templar 23:43:09 04/30/21 (10)
      • RE: I'd use a set of Zeros - Ralph 09:51:59 05/03/21 (9)
        • RE: I'd use a set of Zeros - Simon Templar 14:34:44 05/04/21 (8)
          • RE: MA-1s are fine on Sound Labs. - Ralph 10:22:01 05/05/21 (7)
            • Fairly certain that mine predate that modification.... - Simon Templar 11:02:01 05/06/21 (6)
              • RE: older Sound Labs - Ralph 11:49:47 05/06/21 (5)
                • RE: older Sound Labs - Simon Templar 01:04:05 06/08/21 (4)
                  • I think I can help here.... - Lew 09:05:40 07/06/21 (2)
                    • RE: I think I can help here.... - Atmer 08:15:57 07/11/21 (1)
                      • Just noticed this post, November 14. - Lew 10:41:31 11/14/21 (0)
                  • RE: older Sound Labs - Ralph 09:17:20 06/08/21 (0)
    • Thanks Ralph... - Alsatian 11:07:45 04/15/21 (1)
      • RE: A lot of the LS35/a variants are 15-16 ohms. Get one of those and it will all be good nt - Ralph 12:08:13 04/15/21 (0)
• Anyone Using Any Linear Tube Audio Amplifiers? (nt) - Sibelius 06:05:33 03/08/21 (4)
  • RE: Anyone Using Any Linear Tube Audio Amplifiers? (nt) - MP62 13:49:01 03/28/21 (0)
  • I'm sure they are. - Ralph 14:09:00 03/08/21 (2)
    • RE: I'm sure they are. - Sibelius 08:06:56 03/09/21 (1)
      • RE: no worries! - Ralph 09:21:34 03/09/21 (0)
• 6P45S vs, EL509 - LtMandella 10:10:03 12/11/20 (21)
  • Actually the Russian EL509s are 6P45Ss marked as EL509 - Ralph 10:44:54 12/14/20 (20)
    • RE: Actually the Russian EL509s are 6P45Ss marked as EL509 - LtMandella 19:46:09 12/16/20 (19)
      • RE: Actually the Russian EL509s are 6P45Ss marked as EL509 - Volker 00:44:09 12/18/20 (18)
        • RE: Actually the Russian EL509s are 6P45Ss marked as EL509 - airheadair 09:45:32 12/19/20 (17)
          • RE: Actually the Russian EL509s are 6P45Ss marked as EL509 - Volker 11:29:08 12/21/20 (16)
            • RE: Actually the Russian EL509s are 6P45Ss marked as EL509 - airheadair 19:54:00 12/21/20 (15)
              • There are always solutions. - Ralph 13:01:47 12/22/20 (11)
                • RE: There are always solutions. - airheadair 09:24:31 12/23/20 (10)
                  • RE: There are always solutions. - Ralph 10:54:10 12/23/20 (9)
                    • RE: There are always solutions. - Lew 20:11:31 12/23/20 (6)
                      • RE: There are always solutions. - airheadair 19:11:32 12/24/20 (5)
                        • RE: There are always solutions. - rottenclam 10:47:16 12/30/20 (1)
                          • RE: There are always solutions. - airheadair 18:32:02 12/30/20 (0)
                        • RE: There are always solutions. - Lew 09:56:39 12/25/20 (2)
                          • RE: There are always solutions. - Volker 11:50:49 01/01/21 (1)
                            • Thanks. - Lew 10:03:33 01/12/21 (0)
                    • RE: There are always solutions. - airheadair 14:14:41 12/23/20 (1)
                      • Doesn't Bruce Moore run a shop near there? - Ralph 15:00:58 12/23/20 (0)
              • RE: Actually the Russian EL509s are 6P45Ss marked as EL509 - Volker 02:27:41 12/22/20 (1)
                • RE: Actually the Russian EL509s are 6P45Ss marked as EL509 - airheadair 09:22:40 12/23/20 (0)
              • RE: Actually the Russian EL509s are 6P45Ss marked as EL509 - rivervalley817 21:55:23 12/21/20 (0)

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