Replies to This Discussion

Permalink Reply by darryl kernaghan on January 17, 2018 at 3:22pm

I'm no electro guru, and someone else might help more, but, i think term B will be signal out, so you still have the radio going, even if you connect the guitar to there, I would guess, terminal A is currently radio input to volume pot, and you would need to connect there and either add a switch to change from radio- guitar, or just disconnect radio totally . Looking at your pic again, it could be that A is ground as it appears it might be 1 piece with the terminal strip going to the rear, but hidden by the other component. I've probably confused you more than helped you, but someone will set you straight

• ▶ Reply

Permalink Reply by Timothy Hunter on January 17, 2018 at 11:22pm

i think this is what you are trying to do. i think that volume pot is between the preamp and power amp sections. your rod piezeo doesnt have enough to drive the amp section and you havent isolated the Rf or radio section.  radio was not my field in electronics so i only have basic knowledge. 

• ▶ Reply

Permalink Reply by Paul Cezanne on January 18, 2018 at 11:55am

I tried a 3-pole magnetic pickup just now. No joy.

• ▶ Reply

Permalink Reply by Paul Cezanne on January 18, 2018 at 11:56am

And how can I isolate the RF section? I'd love to not hear the radio...

• ▶ Reply

Permalink Reply by Paul Craig on January 18, 2018 at 12:12pm

If this is the layout, wouldn't it be better to disconnect the RF stage signal and make the wires to the preamp into the new input? Assuming it's not high voltage.

• ▶ Reply

Permalink Reply by Paul Cezanne on January 18, 2018 at 12:34pm

It isn't high voltage. I don't mind doing that but I don't know how.

• ▶ Reply

Permalink Reply by Paul Craig on January 18, 2018 at 8:31am

Lugs 1 & 2 on the back are the on/off power for the radio.

Lugs A, B, & C on the bottom are probably power on circuits to the rest of the components since they have a 9volt reading.

What about the 3 lugs on top with a cap? Trace those 2 wires coming off the top and get a volt reading on them.

• ▶ Reply

Permalink Reply by Paul Cezanne on January 18, 2018 at 11:55am

The three lugs with the cap are for the tone control, but I just tried it. No joy.

• ▶ Reply

Permalink Reply by Paul Cezanne on January 18, 2018 at 12:24pm

Silvertone, from 1961- or 1962

I'll run the resistance test right now.

• ▶ Reply

Permalink Reply by Paul Cezanne on January 18, 2018 at 12:33pm

There are two lugs on the tone pot. (The third is just stick up in the air, not attached to anything.) One of them varies the resistance from 0 to 40k Ohms when I turn the tone pot. The other is ground.

The resistance does not vary with the volume knob turning.

• ▶ Reply

Permalink Reply by Paul Craig on January 18, 2018 at 12:59pm

Showing TR6 and TR7(3 stage pot area) for Audio Output. So 1 of those stages has to be volume.

Does the radio work? just wanted to be sure before going further.

TR1 area looks to be the area to find the preamp, that should be the area for the guitar input. Snap a good pic of the board for me if you can.

• ▶ Reply

Permalink Reply by Paul Cezanne on January 18, 2018 at 1:08pm

It works just fine.

• ▶ Reply

• ‹ Previous
• 1
• 2
• Next ›
• Page