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In Reply to: RE: In the M60 3.3, the cathode follower, V4, is the single in front. posted by jeffreybehr on March 27, 2017 at 18:35:25
Thanks for correcting me on the name of the Sophia tubes.
If I get 2 more tubes is there any more sonic improvement to be gained if I place them in the middle back (V2)?
Since the Sophia tubes are larger and wider I would need to use perhaps a tube socket saver to lift the center tube.
Well I did manage to place 3 of the Sophia 6SN7 tubes across the back row in the M-60's. In order to get the center Sophia installed I used a tube socket saver suggested by Ralph and available on Amazon.
I must say that the sound quality has gone up a couple of notches, very nice improvement.
I'm really happy with the 6 Sophia tubes in my M-60's. I'm not sure how many hours these tubes will last. Any idea anyone?
I was thinking of buying some spares, but they are expensive.
I found some Shuguang 6SN7-T CV181 tubes with brass bases that look very similar to the Sophie tubes and are a little cheaper. However, they have to be ordered from China.
Is perhaps the Shuguang the OEM for the Sophia tubes?
Has anyone tried these tubes?
...use any kind of socket extenders, just find a pair of standard-size RCA or Ken-Rad VT-231s (or TSRPS!) for that position.
Where (rotationally) are you running your preamp's volume control? If it's sort of low and you're 'throwing away' 10 or 20dB of the preamp's Voltage gain, do as I did and buy a pair of Ralph's tube-replacement plugs and replace Vs3 and turn your volume control up 10dB.
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."
With the socket saver there will be enough room to place 3 of the Sophia's across the back row in the M-60's.
I do have many 1950's era RCA's and they do sound good. But, I think the Sophia's add a little more air, dynamics, and increase the soundstage.
I don't know what is inside that CV181-like glass envelope that Sophia uses. If it's a 6SN7 internally, then using them is fine. On the other hand, if it's truly built to CV181 specifications, then keep in mind that the filaments draw 0.95A. That's 50% more current than a 6SN7 filament. If you use 3 or 4 of the Sophia tubes in an M60, it might be stressing the filament supply. Probably using one or two is OK. This issue would be in addition to any issue arising from alteration of the operating points of the tube itself, if it's a CV181.
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