Philco 48-482 question

[Electronic M]

I've got one. I need to recap it eventually. It still works decently on original caps (I've only given it a few minutes of run time to test it though), performance seemed good for a early post war set (most post war FM sets seem to have weak FM)...It was getting comparable reception to a modern set.

I almost recapped mine, but it's a bit tight under chassis, one of the paper caps serves as a coil form (which would have made me re-stuff that then all the other caps to be consistent), and it works which makes it's recap priority lower than other projects that don't work.

[dieseljeep]

Originally Posted by Electronic M

I've got one. I need to recap it eventually. It still works decently on original caps (I've only given it a few minutes of run time to test it though), performance seemed good for a early post war set (most post war FM sets seem to have weak FM)...It was getting comparable reception to a modern set.

I almost recapped mine, but it's a bit tight under chassis, one of the paper caps serves as a coil form (which would have made me re-stuff that then all the other caps to be consistent), and it works which makes it's recap priority lower than other projects that don't work.

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.

[benman94]

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.

[benman94]

Originally Posted by Electronic M

I've got one. I need to recap it eventually. It still works decently on original caps (I've only given it a few minutes of run time to test it though), performance seemed good for a early post war set (most post war FM sets seem to have weak FM)...It was getting comparable reception to a modern set.

I almost recapped mine, but it's a bit tight under chassis, one of the paper caps serves as a coil form (which would have made me re-stuff that then all the other caps to be consistent), and it works which makes it's recap priority lower than other projects that don't work.

I've found most early postwar FM tuners to be piss poor performers. A bulk use the Hazeltine fremodyne which has the sensitivity of a potato...

Exceptions to the rule of terrible post-war FM performance are the GE XFM-1 (mediocre), the Edwards Fidelotuner (mediocre), and the Meissner 8C (phenomenal).

I'll move my Philco up the restoration queue.