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Old 10th Nov 2017, 2:05 am   #41
Synchrodyne
Nonode
 
Join Date: Jan 2009
Location: Papamoa Beach, Bay of Plenty, New Zealand
Posts: 2,943
Default Re: Oh No! Not another howler.

Quote:
Originally Posted by Boater Sam View Post
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?
That AWV Radiotronics article I mentioned earlier shows how to do diode-pentode neutralization, including how to determine the capacitor sizes needed. Here is the basic circuit from that article:

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Cheers,
Synchrodyne is offline