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OTL, Output Transformerless Amplifier User Group.

Which version of the M60 do you have? It makes a difference.

In any event, I've never tried the Sophias.

In the Mk. 3.3, the frontend tubes are arranged in a 'T'...
2016 M-60 Mk. 3.3 photo 2016Apr12_LCh cooking_1800w_zpsos0o4yji.jpg

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.)
 photo 2016Jun08_RC amp_2000w_zps9s1hjral.jpg

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. :-)
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."

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