Re: Top caps ;can you explain them?
Have you got another Mixer/Oscillator valve you could try. It could be losing it at LW.
Lots of such circuits have caps on the mixer and oscillator side linked to the valve. If it has these, check them. Remember that the impedance of a capacitor is higher at lower frequencies. So any cap 'in the way' so to speak could cause this.
Cheers,
Steve P.
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