• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Ear 8l6

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I've deleted the schematic- it's got a copyright notice on it so TdP's permission is needed to post it.

The function of those caps (really, it's the equivalent of a single 50pF cap) is to compensate for the inevitable HF unbalance between halves of the output transformer primary. That's a pretty low value, so presumably, the output transformer is a very good one in that respect.
 
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