Philco 46-1203

the place to share what you are working on and get input if you wish
Post Reply
mvnaylor
Posts: 2
Joined: Fri Nov 12, 2021 3:48 pm

Philco 46-1203

Post by mvnaylor »

Hello forum folks,

My 17 year old son and I have been enjoying working on turntables (usually 70s-80s models) for a local store. We've recently been given a 46-1203 Philco, which has been a challenge. I'll spare you the details.

In short, I need to re-solder the turntable wires. The radio side works fine, but the electrical side of the record player is where we have an issue. I'm no electrician but can solder!
There is a four post wiring block underneath and I have the following wires/components to solder.

1. The two wires from the cartridge through the tonearm.
2. The wire going down to the other side, which I assume is to the amp.
3. A ground wire that just connects under the chassis.
4. A 333K 600V capacitor: The capacitor is this one: https://www.alibaba.com/product-detail/ ... 20121.html

Here are some pictures of the unit I have. https://photos.app.goo.gl/wfpS5Ei9ZVMqNrhn6

These are the Philco schematics I've found for that model, though they don't seem to match. But, as I said, I'm no electrician.
https://www.tubesandmore.com/sites/defa ... pg16-1.png
https://philcoradio.com/library/downloa ... 6-1947.pdf

All that I'm really looking for is which components to solder where on that block.

Thanks for any help you can provide.

-Mike
sdg
mvnaylor
Posts: 2
Joined: Fri Nov 12, 2021 3:48 pm

Re: Philco 46-1203

Post by mvnaylor »

Is anyone able to help me understand how this works?
Hugo
Posts: 174
Joined: Sun Feb 28, 2021 10:20 am

Re: Philco 46-1203

Post by Hugo »

If you look at page 177 of the manual you posted, you will see the schematics of this unit. Section two of this schematics is the AF amplifier. And in the lower right corner is drawn where the record player output comes in. It looks like it hooks up directly to the selection switch at pin 4.
If this radio has a button (or rotary switch) marked PU (Pick Up) or similar or the record symbol, that's where you feed the signal in.
The signal ground is at the base of the record player. From there on you need to run a coaxial "microphone cable" to the switch mentioned. On the amplifier side it seems they used a 2 uF capacitor to shorten AC the signal of the ground wire. Grounding it directly at that side will probably create an earth loop and leaving it open may cause it to act as an antenna for all sorts of noise. If you can not locate that capacitor, you can always get an other one hook it up to.

I have no idea what you mean with that Alibaba capacitor. It is not related to the signal path.
Post Reply