OT Don't read this (was Re: Altair MBL source)

[Christian Corti]

On Sat, 23 Apr 2005, Tony Duell wrote:
>>> ratings -- the EABC80 (6.3V heater), UABC80 (100mA series string heater,
>>> by far the most common version) and the oddball PABC80 (300mA series
>>> string heater). It turned up in numerous AM/FM radios in the 1960s, where

The EABC80 and UABC80 must have appeared around 1952. I have 
Grundig 2012W from 1952 (2xEF41, ECH81, EABC80, EL41, EM34). There was an 
all-current model, too (the 2012GW). Since then most radio sets became 
boring (from the technical point of view) because they were built with the 
same tubes (ECC85, ECH81, EF89, EABC80 and EL84, with very little 
variations).

> 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

Of course it exists! It was very common then.  Thinking of my Graetz 154GW 
from 1950 with UB41 as ration detector and UBF80 for AM and delayed AGC, 
or of my Grundig 380W from 1951 with EAA11 and EBF15. Then there were 
other interesting circuits from Körting (Syntektor 54W, synchronous 
detector? don't know how it's called in English), or simple AM/FM radio 
sets that used only one single diode for AM *and* FM (edge demodulator?)

Christian