Heres a question for the Heathkit experts or former designers. The Heath manual instructs that the connection of the variable load capacitor to the HV circuit should only be crimped, as a mechanical
A question from a new comer. While rebuilding the SB221, I turned it on at final test and one tube did not light well, then after about 15 seconds long 15 mm long sparks in side near the base, then d
Recently I fitted Harbach modifications to an SB221. (I also fitted R Measures glitch resister). With the Harbach kit came the following suggestion to fit a fuse to the HV circuit. == == A HELPFUL HI