Re: VMARS RA17 product detector modification
My audio output mod , of putting the aux EF91 in parallel with the main o/p.
You must put grid stoppers or ferrite beads on at least one valve.
I have just discovered oscillations at 300Mc/s in a set I am doing up.
Showed up as distortion , which stopped when either valve unplugged and minus 0.5 v on grid. Poking bypass C or meter leads had little effect.
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