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OTL, Output Transformerless Amplifier User Group.

In the M60 3.3, the cathode follower, V4, is the single in front.

The two outer tubes, left and right of the top of the 'T', are V1a and V1b. The center tube of the top of the 'T' is V2, the top (Voltage-gain-portion) of the cascade. In the M60 3.3, there is no V3; in former versions this was the CCS.

So if you LOVE the sounds of the Sophias (NOT 'sophies'), use your four in the four V1 positions; I'm stickin' with my TSRPs. :-) :-) :-)

 photo 2017Jan07_from sweetspot_1500w_zps1ixbgto0.jpg

Hope this helps.
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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