Some clarification here just to be clear ;-)

Posted by AbeCollins (A) on March 4, 2023 at 15:15:51

In Reply to: Nice Abe! Maybe we can share impressions soon. posted by JoshT on March 3, 2023 at 16:56:16:

Yes, it will be interesting to compare notes on these tubes in the CM. I look forward to it.

I've been running my more efficient Tannoy Definition D500 towers lately (91dB 6 Ohm nom.) and have the power hungry Thiel CS2.4 speakers stored in the closet.

When I ran the Cronus Magnum on my Thiels I really needed every once of extra power so I was pretty much limited to using the KT120 power tubes. The EL34 / 6CA7 were noticeably compressed sounding vs the KT120. But this is no longer the case with the Tannoys which allows me a broader choice in power tubes for the CM.

As an aside I emailed Rogue a couple days ago. Here' my email exchange with Nick:

Hi Abe,

We have never used he 6CA7 in production for any of our products, so I don't know how their longevity will compare to the EL34 tubes. The GL KT77 is a nice sounding tube which is very similar to the EL34 but should provide longer tube life. The recommended bias setting for KT120's is 35mA and it would be 30mA for EL34, KT77, and 6CA7 tube types. Of the 3 tubes you have listed, I would expect the KT120's to provide the best tube life in the Cronus.

Best Regards,
Nick Fitzsimmons
Rogue Audio Inc.
545 Jenna Drive
Brodheadsville, PA, 18322

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From: Abe Collins
Sent: Friday, March 3, 2023 11:49 AM
To: info rogueaudio.com
Subject: EL34 / 6CA7 / KT120 Bias for Cronus Magnum ?

Hello -

I have an older Cronus Magnum (not the II or III) and have been happy running it with a quad of EH 6CA7 tubes or Tungsol KT120. I have a few quick questions I was hoping you could answer.

Is the 6CA7 considered to be a more "rugged" EL34? I heard something to that effect many years ago. Will the 6CA7 have a longer tube life in the Cronus Magnum vs the EL34?

Your BIAS recommendations for:

- EH 6CA7
- JJ EL34
- Tungsol KT120

I've been biasing them all at 35ma but this may not be quite right. Which of the above tubes should last the longest in my Cronus Magnum?

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Cronus Magnum / Benchmark - Polar Opposites? Sort of:

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Follow Ups Full Thread

Topic - Update No. 1 on my EL34 recommendations post below - JoshT 07:19:19 02/21/23 (34)

I just bought a quad of JJ 6CA7 today for my Cronus Magnum - AbeCollins 09:39:09 03/03/23 (15)

Nice Abe! Maybe we can share impressions soon. - JoshT 16:56:16 03/03/23 (3)

Some clarification here just to be clear ;-) - AbeCollins 15:15:51 03/04/23 (2)

Good news - JoshT 08:01:22 03/05/23 (1)

RE: Good news - AbeCollins 12:35:27 03/05/23 (0)

Awesome - Jack G 15:08:25 03/03/23 (10)

My EL34 to 6CA7 story.... - AbeCollins 15:46:21 03/04/23 (9)

RE: My EL34 to 6CA7 story.... - Jack G 07:54:36 03/05/23 (8)

RE: My EL34 to 6CA7 story.... - AbeCollins 13:20:05 03/05/23 (7)

IMO the Tung Sol KT120...-.. - Mendel 21:38:06 03/05/23 (1)

Tung-Sol KT120, EH 6CA7, JJ 6CA7 comparison - AbeCollins 07:29:33 03/06/23 (0)

Nice! - JoshT 20:22:09 03/05/23 (3)

I'm preferring the EH 6CA7 - AbeCollins 07:31:44 03/06/23 (2)

Interesting - JoshT 13:30:07 03/07/23 (1)

RE: Interesting - AbeCollins 13:52:51 03/09/23 (0)

Good to know. (nt) - Jack G 15:18:43 03/05/23 (0)

to paraphrase Thorsten Loesch ... El34... a fat ballerina, very easy to listen to, my favorite El34~nT - Cleantimestream 09:01:03 02/25/23 (0)

For my Anthem Amp-1 - jedrider 10:29:42 02/23/23 (0)

RE: Update No. 1 on my EL34 recommendations post below - DrN 09:17:04 02/23/23 (6)

RE: Update No. 1 on my EL34 recommendations post below - JoshT 10:07:32 02/23/23 (5)

RE: Update No. 1 on my EL34 recommendations post below - DrN 10:18:22 02/23/23 (4)

I just spoke with Nick and he says 30mA for an EL34 tube in the CMII - JoshT 10:28:42 02/23/23 (3)

RE: I just spoke with Nick and he says 30mA for an EL34 tube in the CMII - Mendel 22:06:07 02/28/23 (2)

Thanks! - JoshT 19:39:47 03/01/23 (1)

RE: Thanks! - Mendel 21:11:15 03/01/23 (0)

RE: Update No. 1 on my EL34 recommendations post below - dean_martin 10:42:15 02/21/23 (6)

RE: Update No. 1 on my EL34 recommendations post below - JoshT 19:58:17 02/21/23 (5)

RE: Update No. 1 on my EL34 recommendations post below - Luminator 20:38:06 02/21/23 (4)

Crazy times! Long response . . . - JoshT 14:12:53 02/22/23 (3)

A minor side note - Jack G 06:54:02 02/23/23 (1)

Oh, cool. Thanks for the heads up. nt - JoshT 07:51:50 02/23/23 (0)

Took it for granted - Luminator 17:25:04 02/22/23 (0)

RE: Update No. 1 on my EL34 recommendations post below - sony6060 10:24:42 02/21/23 (1)

RE: Update No. 1 on my EL34 recommendations post below - JoshT 19:56:15 02/21/23 (0)

Follow Ups

Some clarification here just to be clear ;-) - AbeCollins 15:15:51 03/04/23 (2)

Good news - JoshT 08:01:22 03/05/23 (1)

RE: Good news - AbeCollins 12:35:27 03/05/23 (0)

Some clarification here just to be clear ;-)

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