Took a look inside the top of the SB-220, and sure enough - I've melted the filament out of the pins on the left-hand 3-500. No wonder the input SWR is off... 73, Pete N4ZR The World Contest Station
I believe Ive mentioned many times that operating WARC is best done in the CW position with that amp and around 750-800W. The fan should also be kept clean as well as the motor cleaned and lubed. Cle
Be sure to replace the socket or replace the female contact itself. And check all the others too! 73 Jim W7RY _______________________________________________ Amps mailing list Amps@contesting.com htt
I would also replace the springs that clamp the filament pins. The heat weakens them and then it's a vicious cycle. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ______________________________
New sockets arent that expensive but the frugal ham could swap the complete piece with one from the 3 grid terminals. Then clean and tighten the old one for another 40 years. The main thing is to kee