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In Reply to: RE: Which version of the M60 do you have? It makes a difference. posted by Lew on March 26, 2017 at 14:08:26
Thank you so much for the information.
So, here is what I am gathering for the M-60' Mk 3.3 version;
The best tubes should go at the 2 rear left and right positions. The rear middle position is not affected as much by the tube quality and therefore there is not much need to use (boutique Sophie)tubes in that position. Actually the Sophie's are wider and it would be impossible to fit 3 of them across the back row.
And the front center tube should be a 6SN7GTB per Ralph at Atma-sphere.
Does that sound like I got it?
Edits: 03/26/17Follow Ups:
You'd be much better off with facts from Ralph re what tube does what than conjecture from me. But the concepts are correct. I find it difficult to understand how the two outside tubes among the rear 3 (the tube on the far L and the tube on the far R) are together to form the dual-differential cascode, because those tubes are interconnected in a rather complex way, and I doubt that Atma would have them separated by the presence of the middle tube. It certainly could be the case, but I don't know for sure. That's why I suggest you ask Ralph.
By the way, what is a "Sophie" tube, and in what way are its dimensions different from a 6SN7GT, GTA, or GTB?
...to the Sophia 6SN7.
Tin-eared audiofool, large-scale-Classical music lover, and damned-amateur fotografer.
William Bruce Cameron: "...not everything that can be counted counts, and not everything that counts can be counted."
Took that quote from the Sophia website. It's an odd one, because CV32/33 and CV181 are in fact NOT 6SN7s in any way. I have seen CV181s, and they generally resemble those Sophia tubes being sold as 6SN7 replacements. They are electrically different from a 6SN7, and that's why they will sound different from a 6SN7 if plugged into a circuit designed for a 6SN7. On the other hand, CV1988 is a legitimate alternative name for a 6SN7. I have some Mullard/Brimar tubes that are labeled "6SN7GT/CV1988". I have no idea what Sophia is smoking.
The Sophie tube is an Audiophile tube that is taller and wider than the normal size 6SN7 tubes.
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