• 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.

Chinese tubes

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Thanks Kevin but if English is difficult for me Russian is impossible.
 

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I think the popular Russian 6N6P is a good near-equivalent for 5687. (Different pin-out and heater wiring.) They're not as cheap as they used to be, but they're not insanely expensive (yet).

JJ ECC99 is probably the best near-equivalent if you need something that's being made today. Again, has a different pin-out from 5687 or Bendix 6900.

5687 is not terribly expensive, is it?
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