23 Apr
2005
23 Apr
'05
3:53 p.m.
From: "Tony Duell" <ard at p850ug1.demon.co.uk>
I am not in any doubt that the EB91 was used as an FM demodulator. What I
was asking about was sets that had effectively 4 diodes for FM
demodulator, AM detector and delayed AGC.
I've enver had the pleasure of working on a Hacker (what a wonderful
name!) valved radio. Their transsitor sets are some of my favourites,
though, particularly the RP18 Sovereign. It has separate IF strips for AM
and FM -- the only common stages are the audio ones. And a decent audio
amplifier and speaker specified to give 1.5 honest watts.
-tony
Whether there existed sets with, say, an EB91 (double diode, I think you
call it a 6AL5) for the FM detector and an EBC91 (say) for the AM dector,
AGC, and 1st audio, I don't know, and I am not looking for such a
schematic tonight!.
-tony
The Hacker Mayflower 2 I have on the bench at the moment uses an EB91 as FM
detector, but appears to have no AGC (it is FM only). The is a preset (rear