In Reply to: Atmasphere M-60's with Sophia 6SN7 tubes posted by ozzyboy on March 25, 2017 at 15:22:08:
In any event, I've never tried the Sophias.
In the Mk. 3.3, the frontend tubes are arranged in a 'T'...
The front single is the cathode follower, the left and right rears are the input-gain tubes running in parallel, and the rear center is the Voltage-gain section that I can never remember the functional name of. I've replaced my Voltage-gain single with an A-S plug to reduce the amp's gain. (Ralph used an 'N7 as a current source in the earlier versions but replaced that tube with a solid-state current source in the 3.3.)
I'm using Tung-Sol roundplate 6SN7GTs in my six positions. None is electrically 'matched' to any other, and none tests particularly well, but WOW do they ever sound good. :-)
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Follow Ups
- Which version of the M60 do you have? It makes a difference. - jeffreybehr 11:47:34 03/26/17 (17)
- RE: Which version of the M60 do you have? It makes a difference. - Lew 14:08:26 03/26/17 (7)
- solid state CCS - Ralph 12:24:14 03/27/17 (0)
- RE: Which version of the M60 do you have? It makes a difference. - ozzyboy 15:51:21 03/26/17 (5)
- Ask Ralph... - Lew 17:41:23 03/26/17 (4)
- ozziboy uses 'Sophia' and 'sophie' interchangeably. Here's a link... - jeffreybehr 17:50:56 03/27/17 (1)
- However the vintage European ECC32/33, CV181/CV1988 family of tubes are not real 6SN7 tubes. " - Lew 13:05:51 03/28/17 (0)
- RE: Ask Ralph... - ozzyboy 19:10:38 03/26/17 (1)
- All 6SN7s are "audiophile" tubes - Lew 12:59:09 03/28/17 (0)
- RE: Which version of the M60 do you have? It makes a difference. - ozzyboy 13:42:49 03/26/17 (8)
- In the M60 3.3, the cathode follower, V4, is the single in front. - jeffreybehr 18:35:25 03/27/17 (7)
- RE: In the M60 3.3, the cathode follower, V4, is the single in front. - used-hifi 11:13:40 09/01/17 (0)
- RE: In the M60 3.3, the cathode follower, V4, is the single in front. - ozzyboy 09:52:55 03/28/17 (5)
- RE: In the M60 3.3, the cathode follower, V4, is the single in front. - ozzyboy 16:00:32 03/31/17 (1)
- RE: In the M60 3.3, the cathode follower, V4, is the single in front. - ozzyboy 11:36:50 04/04/17 (0)
- Oh my...I suppose replacing V3 with a better tube will improve the sound, but I sure wouldn't... - jeffreybehr 18:10:40 03/28/17 (2)
- RE: Oh my...I suppose replacing V3 with a better tube will improve the sound, but I sure wouldn't... - ozzyboy 15:14:42 03/29/17 (1)
- RE: Oh my...I suppose replacing V3 with a better tube will improve the sound, but I sure wouldn't... - Lew 07:25:44 03/30/17 (0)