Quote:
Originally Posted by bob91343
Yes R2 is the critical component missing from your unit. It's from the screen to B+.
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Referring to the posted original article above, I think R2, 3.5 meg, from B+ to the screen grid must be large enough to allow modulation
with a very high impedance source. With a lower impedance source, [headphone output from a CD player, etc.], it could be much smaller.
Hope this helps.