• 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.

oil bath cooling for tubes?

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convection cooled tubes - use a chimney, you can also use a fan SUCKING the air from top (DONT blow, sucking the air away works better and reduces thermal stress).

watercooling tubes with a metal can - circulate the water at 0.5m/sec-1.5m/sec in a copper coil wound around the tube.

water cooling of tubes intended for watercooling - use the original coolerassembly and use a polyethylenehose for isolation, use a min. length of 0.8m/kV for destilled water or at least 1.4m/kVp
for tap water (tapwater MUST be drained, dont circulate), consult the datasheet or use at least 1L/min/kW.

contactcooling - has high straycapacitance (even with expensive isolators) but works for tubes with external anode,
consult the datasheet for the highest hotspot temp (usually around 200degC)

oilcooling of glasstubes - have no expirience with it, but my guess is it wont bring much (low thermal capacity, thermal stress, dielectric losses), i think it is better to use a chimney instead, but if you want to try use at least transformeroil, use pressure regulation and overpressureguards and prevent aircontact.
 
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