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RE: To split hairs...


A cathode follower IS a buffer in that it provides a low impedance output and acts as a buffer between the signal and the load -- the output load in this case would be the power amp.

The 6H30 is a dual triode. I suspect they use one 6H30 per channel and two triode sections of the tube to accommodate for the +/- voltage swing for the balanced output. Repeat for the second channel. Hence, the need for two dual triode 6H30 buffer tubes.

I don't have a schematic but here's what I envision, per channel:

A pair of JFETS for gain each driving 1/2 of the 6H30 cathode follower then out to the power amp.

Repeat for the second channel.

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