stewart - warner 300

[Reece]

Electronic M is right, you need to keep the three tuning caps in about the same position. Put a strong local station on another radio and look at how the tuning cap is meshed. Then put the three tuning caps on the Stewart Warner in the same position and try. Each will have to be tweaked to max the signal.

This hassle is why the mfrs. worked so hard to get one-knob tuning!

[stusnyder]

Originally Posted by Reece

Electronic M is right, you need to keep the three tuning caps in about the same position. Put a strong local station on another radio and look at how the tuning cap is meshed. Then put the three tuning caps on the Stewart Warner in the same position and try. Each will have to be tweaked to max the signal.

This hassle is why the mfrs. worked so hard to get one-knob tuning!

I'll try it tonight, thanks for the tips!

[stusnyder]

I checked it out more last night and it seems like one of the transformers is not getting power to it.

[wa2ise]

Originally Posted by stusnyder

it seems like one of the transformers is not getting power to it.

Sometimes the rosin in the solder used back then was a bit corrosive on the fine copper wire. Sometimes careful resoldering to bridge the break might fix it.

[stusnyder]

Originally Posted by wa2ise

Sometimes the rosin in the solder used back then was a bit corrosive on the fine copper wire. Sometimes careful resoldering to bridge the break might fix it.

Worked on it tonight, I do have power in and out both transformers. Checked out everything else and did not find anything obvious. 2 capacitors in entire radio. No value listed on them or in schematic. Anyone know what value are these?

[leadlike]

Caps are typically 1 or 2 mfd, rated for a couple hundred volts DC. On these 20s radios, typically you'll find the interstage transformers open. There are replacements available-I believe AES sells just the bobbin and windings so you can use parts from your old tf to keep things looking original. You can also bypass your tfs with some common value caps and resistors. I think the Philco repair website has a how to on that.

[stusnyder]

I did some checking on it tonight, it seems like one transformer is open.