Hi Jack,

Have you tried removing drive to the PA and looked for output RF ?

Grid stoppers in place ?

Close, appropriate tight de-coupling to chassis (G2, A1 supply past
anode RFC) etc. ?

APC in the PA anode ?

Any chance of a photo to look at construction techniques ?

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

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