• 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.

Are the 12B4 and 12b4A interchangable?

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I just bought a ModWright tube headphones amplifier (called Tryst). it has a pair of 6922 in the input stage and 4 12B4 in the output.
I have read that the best sounding 12B4 are GE but it seems almost impossible to find 12B4 tubes I can only find 12B4A.

Do you think the 12B4A can be used?
 
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