Dr. William J. Schmidt, II wrote: > Yeah now that I look at the pictures, it's either a 250TH or a 450TH... > those are the only tubes that will fit. The 304TL doesn't work because > it has a dual filament (4 pin connections). Oops, you're right! -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco