Re: Oh No! Not another howler.
Diode to pentode grid is probably the pathway that this set suffered from, it oscillated in isolation whenever there was HT.
There is no neutralisation that I can recognise, my grid stopper works perfectly.
How would you neutralise this stage in the conventional sense?
I had capacitors all round it, the only time the howl stopped is when I killed the signal on the detector diode or the pentode anode as there was nothing going to the audio amp. So that was not the right way!
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