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Edmund H. Ramm wrote:
I found in the technical bullettin n.83 the schematic and alignment instructions. The first thing I noticed is the G1 of 6146 is supposed to be at -85V in CW tx. How is that possible since the only negative supply in this transmitter is -50V? I infact measured -50V when in CW mode, but I didn't key the transmitter as the 8289 died before I could try. Those -50V you measured are the protective bias. When excited, the resulting grid current will add to the protective bias. ah that's why... It's working in C class with G1 current! I would never expect an AM TX final amplifier to work in something else than A or B class. Thanks for the hint. Do you know if this protective bias should be present also when the G.222 is operated in AM position? Tnx, 73 Frank IZ8DWF |
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