Note: It turns out this is not the schematic since it is 6v, not a 9v circuit. I have something which may be the real schematic! The radio is almost certainly a Silvertone 700. And go easy on me, my degree does have an EE in it, but it also has a CS in it and I do CS stuff for a living, that EE was really a long time ago.īonus question: I'd love to know why this works, it seems to me that I'm mixing the guitar signal with the radio signal but all the web instructions just say that you don't hear the radio.īonus question #2: Just how would I find and cut out the radio section? I'm guess that once I find the right place to tap into I just cut there to remove the radio from the circuit, is it really just that easy? One member of the cigar box forums said that the rod piezo pickup might not put out enough power, so I tried a wound magnetic pick and got the same results.Īnd here's the 'schematic' of the radio: (ok, so it is just a parts list.)Īll the online tutorials make this look easy, but I'm baffled at this point. So when I hook the rod-piezo to B and to ground I still hear the static of the radio and when I pluck the string, I do not hear the note out the speakers. So it seems to me that I should be hooking into tap B. I pull the batteries and measure resistance (and yeah, I know, the pot is in the circuit so it isn't accurate but I'm just trying to find the "input" lead.Ī always reads 4k Ohms, B varies from 2k to 4k, C is at 2k no matter what I do with the volume knob.ġ in always at 2k Ohms, 2 is 0 Ohms when off, 2k when on (which makes sense since it is connected directly to the battery) Taps A, B and C also have 0v when the volume is off, and 9v when the volume is on. Tap 1 has 9v when the volume control is clicked on, 0v when off. Now the problem is, when I attach the leads from the guitar I don't hear the string from the radio's speaker. I've been able to identify the volume pot by hooking up my Ohm-meter and turning the volume knob.
Now my radio has 2 concentric pots, one for volume and one for tone. Attach the other lead from the guitar random posts on the volume pot and strum until you hear your guitar through the speaker.Ground one wire from the guitar cord to ground on the radio.
Instructions for conversion are all over the web but basically consist of this: The old radio works fine, I put 6 D-cells into it and I can pick up AM stations just fine. (CBG's are typically built with primitive equipment and the inherent distortions and defects are considered part of their charm.) I have an early 1960 Silvertone transistor radio that I'm trying to convert to a guitar amplifier for a cigar box guitar, aka a CBG.
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