Quote:
Originally Posted by dieseljeep
I have one, as well! Mine needs a re-cap, FM is non-existant. FM1000 checks good. Philco referred to that circuit as a locked oscillator FM detector. It couldn't have been that good, they only used it for a year or two. 
That thing was $150 in 1948! They seemed to sell a lot of them. |
It's possible that the circuit was a poor performer, but a paper from the BBC showes it had average performance in some regards, but unparalleled AM rejection. Perhaps the FM-1000 tube was too expensive to manufacture? Or too difficult to get adequate alignment on an assembly line? Makes ya wonder in any case... the Philco 48-482 was a major seller.