[R-390] Penultimate recapping an R-390A

[Drew P.]

Don wrote:

"The problem isn't instability or lack of a product detector, it is
the low BFO injection.  This can be much improved by increasing the
BFO injection capacitor and re-tuning the BFO neutralization.  I
wouldn't say it works "perfectly" compared to, say, a 51S-1, but it
does work just fine."

And for another simple tweak which works wonders alongside the ones which Don mentioned, don't forget the 2 diode (Dallas Lankford) AGC modification.

Drew