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Self Osc Problem
Hi Jack,
Have you tried the PA without any excitation ? Do you have an APC in the anode line, and an approprate RFC to HT (with good decoupling to chassis) ? How about grid stoppers ? Regards, Mark On May 23, 5:23 pm, Jack Schmidling wrote: I am building an exciter for my 8000 rig. 6AG7 VFO, 6CL6 buffer and 807 final. I am plagued with the problem that resonance in the final does not agree with peak power out. The power peak (watt meter or light bulb) is a considerable twist south of the plate current dip. Looking at the output on a scope shows nothing strange about the wave shape as the amplitude increases beyond the dip. I have tried neutralizing with coupled links between the input and output tanks but it makes no difference nor does anything else I have tried. Any ideas would be welcome. Jack K9ACT -- PHOTO OF THE WEEK:http://schmidling.com/pow.htm Astronomy, Beer, Cheese, Fiber,Gems, Sausage,Silverhttp://schmidling.com |
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