[GregL]

I believe this to be a 650 chassis, which I'd like to confirm or correct if necessary. I've heard others call it a 36-650. Does the "36" refer to year of manufacture?
Also, is the "8-35" on the transformer a date code?
Thank you again, Greg

[Nathan Slingerland]

The year prefix (37-XXX, 38-XXX, etc.) wasn't used until the 1937 model year. So a 650 is only that (not a 37-650).
The 37-XXX models were also the first to have the much maligned separate RF chassis / 'unit construction'.

Anyway, based on this info:

http://www.philcorepairbench.com/socket-layouts/

   

I don't think that's a 650 chassis.

Maybe 660?

   

[GregL]

Thank you Nathan. Is there more info or pictures I could post to confirm?

[Nathan Slingerland]

Do the tubes in the chassis match those in the socket layout diagram above?

Does the number of bands on the dial comport with the description of other 660 chassis models in the Gallery?
http://philcoradio.com/gallery2/1936a/#Model_660L

Does the component placement and part numbers line up with 660 service info?
http://www.nostalgiaair.org/pagesbymodel...013828.pdf

[GregL]

It looks similar to my untrained eye but I'm not certain if the tubes marked 76, 77, 78 & 80 match up with those in your diagram?

[Nathan Slingerland]

It might be helpful if you could provide a photo of the underside of the chassis.

Another great data point would be the part number printed on the dial.

As far as I can tell that particular power transformer is consistent with model 660 - and I couldn't find any other model that uses it.

[GregL]

Thank you Nathan, I will post that image shortly. Where might I find the dial part number?

[GregL]

Could this be the dial part number? 27-5115

[Ron Ramirez]

Can't be anything other than a 660...or it could be a 665 (same tube lineup, very little differences between the two).

[GregL]

Here is the underside.

[Ron Ramirez]

Amazingly clean. Unusually clean. Wow. I almost never see 1930s Philco chassis that are this clean underneath.

[GregL]

Well that's nice to hear Ron. 
Do you happen to know the difference between the 660 and the 665? 
I just want to be absolutely certain what I have when I take it in for servicing.
Greg

[Ron Ramirez]

Offhand...no. Same number of tubes, same tube types, same band coverage.

Any competent repairman will compare the service data between the two, comparing this also against your chassis, and making a final determination.

[GregL]

OK, so the 665 is probably just a revision of the 660. 
Am I correct in dating this chassis as a 1935?

[Radioroslyn]

I gave the 665 info a quick look and I did see that it has the correct alignment for the bcb. On the 660 there's a misprint and a note correcting the misprint.
If you have nothing but time here's a link to a 660L chassis I serviced a couple of yrs ago. http://philcoradio.com/phorum/showthread.php?tid=14829