[R-390] R-390/R-390A AGC for SSB, fix to Dr. Lankford's 2 diode mod update

[Larry H]

I originally announced my fix to *Dr. Lankford's 2 diode AGC mod *on Sept
2, 2017.  It contained a 68 mfd cap, but recent testing showed me that a
better value is 10 mfd.  The reason is that the 68 mfd cap would charge up
quickly and slowly discharge thus changing the agc level for a few
seconds.  The 10 mfd cap is large enough to keep the fast attack for ssb
still working.   My apologies for not getting this right the first time.
I'm attaching the schematic showing the change.  I'll be sending a complete
updated document to Al to replace the one on our 390 disk.

Regards, Larry
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