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What is this mess? - Printable Version

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What is this mess? - OldRestorer - 11-28-2020

So I bought a Philco 90 off eBay for $95.00 and picked it up. I am now looking it over and I am lost. I think it is the early 90 with the dual 45's but the tubes in the sockets are all completely whacky...

There is a big 47, a few 27's, a few 24's, an 80 and one I cant read.

The chassis layout is the early one. The tubes in the sockets don't match the later 90 either..

Anyone?

RE: What is this mess? - KCMike - 11-28-2020

Looks to be in good condition for restoration.
I think you have this one.
https://philcoradio.com/library/download/service%20info/wiring%20diagrams/vol1/split/Part54-Philco%20Wiring%20Diagrams%20Vol.%201.pdf

RE: What is this mess? - Ron Ramirez - 11-28-2020

Hi Kirk

That is what is commonly known as the "mid" version 90 with single 47 output.

It looks like someone stuck a 47 (or a 46?) where a 27 should go.

Here is how the tubes should be placed in the sockets:

   

RE: What is this mess? - OldRestorer - 11-28-2020

Thank you!
I could not find the info on the mid season on my phone.

Icon_smile

RE: What is this mess? - morzh - 11-29-2020

It will of course need the multi-section shield.

RE: What is this mess? - radiorich - 11-29-2020

Hello kirk,
What great Find and yes I have ran into that issue before maybe Ron knows but I bet there are not as many of the "mid" version 90 with single 47 output that were made because this only the second one that I have ever seen.
Far as the tubes I bet you you find maybe those are dude tubes .
I have bought a couple sets where they just stuck wore out old tubes just to fill the chassis when selling it.
Sincerely Rich

RE: What is this mess? - radio1 - 11-29-2020

Has anyone ever owned and heard the last version? I read it is a push-pull that they put back in it - rare. How does it compare to the single 47? From what I've read the push pull evens out the final stage with less distortion on these.

RE: What is this mess? - radiorich - 11-29-2020

Hello Brobertson,
I bet it does because I have a 1940s general Electric  console which uses two  6V6's in pushpull arrangement.
it really has some nice audio .

Sincerely Rich

RE: What is this mess? - Ron Ramirez - 11-29-2020

Regarding the third version 90:

Yes, they went to push-pull 47 outputs which is nice, but they cheapened the front end by getting rid of the separate oscillator tube and adopting the "autodyne" circuit; i.e. using a single 24 as mixer and oscillator. A poor design then, an even poorer design now. Ask anyone who owns a Philco 89 or 19.

RE: What is this mess? - Steve Davis - 11-29-2020

Quote:Has anyone ever owned and heard the last version? I read it is a push-pull that they put back in it - rare. 


Brobertson, I have a late version 90. It is a very good sounding radio, maybe because the speaker has been re-coned. Here you can read about the restoration   Philco 90 Restoration (philcoradio.com)      

The mid version is the most common, followed by the early version, the late version is the least common of all.

Steve