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May 23, 2020
Thatís not all the problems with tube amplifiers. They have horrendous voltages racing around in their cases. They can literally kill the careless hobbyist. As the tubes wear they need their bias voltage adjusted, if you have an amplifier that even gives you the capability to do this. It is hard to find people who can work on them, and when you do find someone, they are likely to sneer at your choice of tubes, tell you this design could never have worked, and charge you two hundred bucks for a repair job that leaves you with a non-working amp.