My experience exactly.  I don't remember if I found the patent, would be interesting to know the date.  The S-38 and the Echophone EC-1 were basically 5 tube wonders with an extra tube which served as BFO and NL.  The S-38/B and later eliminated the extra tube , giving up the NL .  I think the idea was to cut cost at a time when Inflation was rising rapidly.  I don't remember the circuit worked very well although I was able to sort of get SSB on the thing.  



Sent from my Galaxy


-------- Original message --------
From: Hubert Miller <[email protected]>
Date: 1/8/23 12:18 AM (GMT-08:00)
To: [email protected]
Subject: Re: [ARC5] How Edwin Armstrong invented the superhet

Those beginner level receivers that used regenerative IF, such as S-140, Knight Star Roamer, S-38, maybe others, I have never read a review that was
positive about this circuit. That was also my experience trying this on a Command Set receiver. When I read the article on the ARC-2 suggesting this
trick, I thought about just how well that would work out.
-Hue Miller
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