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Philco Model 20 ? - Printable Version

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RE: Philco Model 20 ? - PhilcoPhan1936 - 02-13-2018

I have a Revised Philco 20 I will be working on for a client, and it has what looks like a factory installed dial light, mounted in front of the tuning condenser. I'll check my early version 20B tomorrow and report back....

RE: Philco Model 20 ? - Ron Ramirez - 02-13-2018

At first, model 20 sets did not have a dial light. Sometime early on during production of the 20, a dial lamp was added. As was typical of Philco, it was not documented. So if yours has one and it looks as old as the rest of the chassis, be assured it is likely factory installed.

RE: Philco Model 20 ? - vecher - 02-13-2018

Mine looks factory.. It uses a 6-8 volt bulb tied to the Filament winding of the 71-A tubes..

Directly on the Transformer. Pins 7 and 8..


[Image: https://farm5.staticflickr.com/4651/39352546375_20022aa0bc_b.jpg]

Skip

RE: Philco Model 20 ? - Radioroslyn - 02-13-2018

Have seen the 20 chassis w/o and w/ a lamp.
But most have bad rf coils.

RE: Philco Model 20 ? - vecher - 02-14-2018

Ok next question.. Alignment..I received Chucks package with instructions and schematics.. However The Alignment is very vague..

Does anyone have alignment instructions with location of the Trimmers? This is for the later model with 3 adjustments on the tuning Cap..

Thanks
Skip

RE: Philco Model 20 ? - Radioroslyn - 02-14-2018

Set it to 1440 and peak the 3 trimmers. Done.

RE: Philco Model 20 ? - vecher - 02-14-2018

That's two easy

Skip

RE: Philco Model 20 ? - WallaceRoger - 02-14-2018

Speaking of bad RF coils in the 20, I still haven't resolved mine...

RE: Philco Model 20 ? - vecher - 02-14-2018

Ok powered up .. 115 Volts at .62 amps.. Received stations across band using a 2 foot antenna..

Looking good..

B+ 252 Volts..

Not going to mess with alignment as Receiving good..

Skip...

RE: Philco Model 20 ? - morzh - 02-14-2018

Skip

as it is a TRF, the alignment is super-easy. But that could improve your sensitivity a whole lot. of course, only if you are going to listen to it; as a demo unit, it's ok the way it is.

RE: Philco Model 20 ? - vecher - 02-14-2018

Ok I guess it cannot hurt..

I will give it a try..

Skip...

RE: Philco Model 20 ? - Radioroslyn - 02-14-2018

>Speaking of bad RF coils in the 20, I still haven't resolved mine...
Gotta get busy and rewind the primary. I got Skip a chassis but the coil he needed form it was open popped it out and rewound the pri in a 1/2 hour or so sitting around watching the Match Game on tv. I know I need a life!

RE: Philco Model 20 ? - vecher - 02-14-2018

Terry, The one you rewound is working perfect..I also used a couple of the Bakelite caps and re stuffed them. A couple of mine were broken..

Also used your Capacitor Can .. Re stuffed and just swapped it.. That worked great..

I was lucky that the speaker and Field coil were good.. Radio doesn't sound that bad..

Alignment did help a little..

Now need speaker cloth..

Skip...