Tube DIY Asylum

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RE: Grid Stopper Resistors.

Posted by Paul Joppa on January 10, 2017 at 10:26:57:
My most memorable incident occurred ~15 years ago, with a 2A3 amp I had just built. Everything looked good, but it had a distorted buzzy sound and the voltage measurements made no sense - they were not even self-consistent. I had spent an hour or two in the lab trying to figure out what the problem was, before I noticed the soldering iron. It had an LED array showing the temperature, and the LEDs were flickering. I shut off the amp and the LEDs stabilized, but they resumed when I switched the amp back on. The amp was apparently making enough radio frequency noise to cause the flickering. Adding a 1K grid stopper immediately fixed the problem, the sound was great, hum/buzz gone. Lesson learned!