Replies to This Discussion

Permalink Reply by Scott aka Farmer Ted on January 15, 2015 at 6:36am

Looks like a basic pre-amp from a CV acoustic electric. The battery is likely underneath the front control panel, accessed by unscrewing the two black knobs top & bottom of panel. Need a fresh battery to get it working. Then check to make sure all soldered parts are good, and it should work fine.

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Permalink Reply by jawbone on January 15, 2015 at 7:27am

Thanx Scott - I'll give that a whirl !! :-)

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Permalink Reply by Scott aka Farmer Ted on January 15, 2015 at 8:56am

The tell tale sign that there is a battery is the LED.

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Permalink Reply by jawbone on January 15, 2015 at 9:42am

Yep - sure enough - buried down in there was an old dead battery - plus, I don't know I would have recognized those knobs as knobs - thanx !!!

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Permalink Reply by The Phrygian Kid on January 15, 2015 at 10:47am

It also probably won't work until there's a pin from a cable plugged in the jack there.
+10 for the bits of guitar still screwed to it

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Permalink Reply by jawbone on January 15, 2015 at 11:18am

Well, there are two wires plus the ground coming from the jack - I didn't have a battery so I hooked up to a wall wart with a 9v adapter and tempo'ed a saddle with the rod on a CBG and gave it a go - real bad hum so I guess I'm not out of the woods yet.

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Permalink Reply by David L. on January 15, 2015 at 12:11pm

Did you get any sound from the piezo or just hum? The wall wart may be introducing the hum - a battery wouldn't have this problem.

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Permalink Reply by The Phrygian Kid on January 15, 2015 at 1:07pm

Might have flipped the phase on the power too, remember this is direct current. Because the (-) side is sent thru the ground side of the jack for switching it off, I imagine putting the battery in backwards (which you cannot normally do because of the keyed form factor) would create howls for sure....

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Permalink Reply by jawbone on January 15, 2015 at 3:18pm

Yeah, I'm hoping it is because of the wall wart - but I don't have a battery right now - when I switch polarity it doesn't work (no led).

It seems to work, just very loud hum along with the amplification - I'll search around for a battery.

Thanx all.

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Permalink Reply by The Phrygian Kid on January 15, 2015 at 3:42pm

try flipping the phase from this wall wart if you can, maybe a huge improvement ;)

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Permalink Reply by jawbone on January 15, 2015 at 5:16pm

Do you mean that I should turn the wall wart around ??  It has a polarity switch that when I switch the polarity the EQ doesn't work at all. I'm not sure I'm understanding the terminology.

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Permalink Reply by The Phrygian Kid on January 15, 2015 at 5:52pm

Well I wouldn't turn it around in the wall socket, that's dangerous..
But maybe clip the low voltage wires coming out and flip em yeah...

A lot of the ones I have interchangable connectors for the end, and they can be connected up to the adaptor in Either phase just by turning that connector over..

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