• 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.

What do you guys use for HV toggles?

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#21
Giaime said:
Won't realys have the same problems? They're rated for 250VAC, and 400VAC (industrial ones) are EXPENSIVE!

To Chris my dear moderator friend, and also to Stuart: look at Tony's amp, my preamplifier (the one you kindly helped me to desing) will be pretty similar/identical in cabinet construction! 😀
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while i do switch from triode to pentode mode on the fly i do not toggle the switch very often, besides there are 1K resistors that connects to the switch contacts so arcing is minimised.
 
#22
Relays have the virtue of removing high voltage to a safe distance from the finger. I have a fear and loathing of high voltage.

FWIW, the first three relays I looked up in Mouser had dielectric strength ratings of 1500V. And that's more than OK because there isn't a lot of voltage between the contacts, just the idle current of the tubes times the DCR of the portion of the output transformer the switch is bypassing. The withstand must be between the contacts and ground.
 
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