[R-390] Yes, another SSB demodulator for the R390X and SP600

[Perry Sandeen]

Yo Bubba Dudes!
Before you do a selective groan of *not again* please consider this circuit developed by Grayson Evans KJ7UM in the November 2020 issue of Electric Radio.
The circuit uses a 6BN6 (which I'd never heard of) which is a gated beam tube.
It works as a DBM in a very simple circuit, which is a dream come true for us hollow state devotees. Also it is about $4 to $5 each on ebay if one buys a sleeve of 5. 

Where one would would install it in a R390X might be a bit problematical but there is much more real estate choices on a SP 600.
While their are several fast attack - slow decay ACG circuits for the R390X receivers, I'm unaware of any developed for the SP 600.  If any are known, I'd appreciate the circuit off list.
And for the non-woke (what ever that's supposed to be) a Merry Christmas and a happy New Year to all.
Please always remember and never forget that on next Jan 1st, we will all be able to look back with perfect 20-20 hind sight!
Regards,
Perrier