Tubes Asylum

• RE: Curious - Steve O 04:17:29 08/22/23 (5)
  In Reply to: RE: FWIW... posted by Rod M on August 21, 2023 at 18:01:16

  The original MC30 didn't use 12AT7s, only 12AX7, 12AU7 and 12BH7. In what position(s) are you using the T7s?
  

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  • RE: Curious - Rod M 06:44:07 08/22/23 (0)
    In Reply to: RE: Curious posted by Steve O on August 22, 2023 at 04:17:29

    Oops, next time I'll check the small print with my reading glasses on. you are correct, I was looking at the 12AX7.
    
    
    -Rod
    
    
    

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  • RE: Curious - dgaapc7 05:53:54 08/22/23 (3)
    In Reply to: RE: Curious posted by Steve O on August 22, 2023 at 04:17:29

    Call me ignorant. Two per channel but I don't really know their role in the circuits.
    LowIQ
    
    

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    • RE: Curious - Rod M 06:47:54 08/22/23 (2)
      In Reply to: RE: Curious posted by dgaapc7 on August 22, 2023 at 05:53:54

      Here's some info:
      
      Tube Compliment
      3 - 12AX7A Input and Phase Inverter
      4 - 12AT7 Voltage Amplifier and Driver
      4 - KT88/6550 Power Output
      
      -Rod
      
      

      • https://www.mcintoshlabs.com/-/media/Files/mcintoshlabs/Docu   (Open in New Window)

      
      

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      • RE: Curious - Tre' 16:40:20 09/03/23 (1)
        In Reply to: RE: Curious posted by Rod M on August 22, 2023 at 06:47:54

        I'm seeing 1/2 a 12ax7 input gain stage (V1), a 12au7 phase inverter(V2), a 12bh7 driver (V3) and a 12az7 cathode follower (V4) per channel.
        
        Tre'
        Have Fun and Enjoy the Music
        "Still Working the Problem"
        

        • http://www.tubebooks.org/file_downloads/McIntosh/MC275_sch.p   (Open in New Window)

        
        

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        • I had no idea, the new ones are a completely different circuit. - Tre' 16:42:35 09/03/23 (0)
          In Reply to: RE: Curious posted by Tre' on September 03, 2023 at 16:40:20

          .
          Have Fun and Enjoy the Music
          "Still Working the Problem"
          

          • https://www.drtube.com/schematics/mcintosh/mc275-mk4-service   (Open in New Window)

          
          

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