• 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.

is 6s2p actually equiv to 8532?

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Radiomuseum lists the 6S2P as equivalent to the 6J4, and the 6J4 as "normally replaceable slightly different" to the 8532. Which is as good as equivalent in my book. In any case the pinout, heater voltage/current etc. is the same.
 
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