Philco 90 mystery connector - Printable Version
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Philco 90 mystery connector - 37silverstreak - 12-31-2011
Hey everyone,
I'm working on my newest project, a model 90. It's a mid production one with the single 47 output tube. the serial number is 912648 and it has this Fahnestock connector on it near the speaker plug. Anyone have any ideas what this might be for? while cleaning the chassis I found that someone had scratched into the surface "magnetic spkr" or something on that order next to it. It's faint and hard to read even with a magnifying glass. Any ideas? Thanks!
Kevin
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Re: Philco 90 mystery connector - Radioroslyn - 12-31-2011
Looks to be added on. Where does it connect to? I'd take a guess and say it's to connect a hi Z pm speaker to. If so it would have a large paper cap between the clip and the plate pin of the 47 tube.
Terry
Re: Philco 90 mystery connector - 37silverstreak - 12-31-2011
7estatdef Wrote:Looks to be added on. Where does it connect to? I'd take a guess and say it's to connect a hi Z pm speaker to. If so it would have a large paper cap between the clip and the plate pin of the 47 tube.You are right on the money Terry! there is a 2mfd electrolytic from the clip to the plate of the 47 tube. Someone has monkeyed around with this set sometime in the not too distant past. So it may have been added at that time. It's going to be a lot of fun undoing someone elses hack job
Terry
!Thanks for your input and Happy New Year!
Kevin
Re: Philco 90 mystery connector - Radioroslyn - 12-31-2011
If you wanted to use it you would connect a pm speaker with an output transformer between the clip and ground.
Terry
Re: Philco 90 mystery connector - TA Forbes - 01-01-2012
If it is an older mod it would stand to reason that it was done so that folks back then could listen to their radio using their older stand alone "horn" speakers.
A couple of my late 20s-early 30s sets have this provision from the factory.