The PHILCO Phorum
38-1525 - Printable Version

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38-1525 - w0ene - 09-27-2023

I have a Philco chassis marked 38-1525 that I am trying to identify.   It came in a tombstone cabinet marked 38-643.  The chassis has simular rf coils and tuning mechanism to a 655 but has all metal octal tubes.  It also has two phone Jack's on the back of the chassis for audio input.  The wiring is original so I doubt that it was upgraded with more modern tubes or belongs in this cabinet.  The power transformer is toast but the rest may come around.  Does anyone have any info on this chassis?  Any help would be greatly appreciated.  Thanks

RE: 38-1525 - admin - 09-27-2023

Thread moved to Philco Home Radio by admin

RE: 38-1525 - Ron Ramirez - 09-27-2023

Hi,

There is no such thing as a model 38-1525. This may be a Philco part number for some component?

Photos of the chassis would be very helpful. As these left the factory, they were made so only ST (taper-top) glass tubes could be used. It was common for repair shops to modify the tube shield bases (or remove them entirely) so metal or GT tubes could be used. Perhaps this is what happened to your chassis. An audio jack, or jacks, was also a common add-on, not done at the factory but later on by repair shops (and, sometimes, owners themselves).

How many tubes does this chassis have in it? Again - photos would help a great deal.

If you need guidance on posting photos here, please read:

https://philcoradio.com/phorum/showthread.php?tid=29
https://philcoradio.com/phorum/showthread.php?tid=4407

RE: 38-1525 - GarySP - 09-28-2023

Welcome to the Phorum! As Ron said, there is no 38-1525 radio. I suspect that number is the actual chassis part number. Several different radios housed a very similar chassis design. Photographs and tube count would help immensely. If there is a power cord on the radio DO NOT plug it in. Some of these similar chassis were battery sets. Take care and BE HEALTHY! Gary

RE: 38-1525 - w0ene - 09-28-2023

I'll give the picture attachment a try.  The wiring on this chassis looks original and factory.  The no. 1 pins on all of the tube sockets are grounded
with exception of the rectifier tube which would indicate to me that it was a metal tube set from the beginning.  If it was retubed and modified 
later, it was a professional job and I would say completely rewired.  The output tubes are wired in pushpull and are along the left side of the 
chassis.  The audio driver transformer is located on the bottom of the chassis.  The IF transformers were made by JW Miller, another possible
indication that it was rewired at sometime.   It had 8 tubes originally, some were missing.  The set included a 5U4 Rectifier, 6K8 Mixer, 6SK7 
RF Amp?, 6SG7 IF?, and a 6SR7 det/amp.  Looks like the output tubes were 6F6s.  Thanks for reading my post.

   

   

   

RE: 38-1525 - Ron Ramirez - 09-28-2023

Some observations:

1. Philco did not use metal tubes originally. Philco was feuding with RCA throughout the 1930s. RCA was a heavy proponent of metal tubes. For this reason, Philco refused to use them, instead having Sylvania (who made their Philco branded tubes for them) make glass octal tubes with ST or "taper-top" glass envelopes.

2. Radio manufacturers did not attach tube sockets with screws; they used rivets.

3. Philco used phenolic wafer sockets when this chassis was built, not the black bakelite Amphenol sockets.

4. The IF transformers are not original.

5. Philco did not use octal tubes in their 1936 radio models.

I find it very odd that what is obviously a 1936 Philco chassis would be inside a 38-643 cabinet, unless (a) the chassis was stuck inside backwards or in a manner that the control shafts did not protrude through the front panel; or (b) the front panel was redrilled to accommodate these control shafts.

Can you post photos of (A) a top view of the chassis), (B) an underside view of the chassis, and © a photo of the cabinet, please?

I think the chassis is a heavily modified model 640. It has four bands on the dial scale, and shows evidence of once having a vertical mounting power transformer. It is probably not worth restoring - in my opinion.

RE: 38-1525 - Brad Winder - 09-30-2023

So, the 38-643 was a battery set, and so what I think you have is the original chassis converted to electric. Very common to find battery sets done this way, after electricity came to a rural area in the late 30's and 40's. Usually octal sockets were installed and either 6 or 12 volt tubes (12 volts common after the war) were used, and the set was "rebuilt" as a transformerless AC/DC configuration.

I've seen some done very well by radio shops in the day, and others butchered by "the local handyman"

RE: 38-1525 - w0ene - 10-01-2023

Thanks for the reply Brad.  I was in error, the cabinet is a model 643 643A according to the paper inside.  So everything now makes sense.   The tech that modified this one was a pro.  It had a power transformer that  I removed.  It was toast.  Because the cabinet is in good condition after refinishing and the new dial I found plus the quality of the wiring, I may yet restore it.  My experience includes many boat anchor restorations.  This would be my third or fourth appliance radio.  Thank you all for your interest and assistance.