Question about Peavey BACKSTAGE 6-inch Guitar Amplifier With Transtube 10-watt

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Blew a resistor and a capacitor

Would you happen to know the resistor for a peavey backstage R-49 and C27? or know how i could find out?

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I would take it to a peavey dealer that has its own tech. Most of these guys are peavey certified through a course. Finding the schematic is hard. I also think it has other circuit problems and what you found is only the result of what is bad.

Posted on Mar 29, 2014

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Posted on Jan 02, 2017

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I have a peavey valvenmaster head that was playing at very low volumes even when cranked up pretty loudly. i replaced all of the tubes with new matched groove tubes and the volume and tone improved. ...


You start by downloading the schematic here:

http://elektrotanya.com/peavey_valveking_100_212.pdf/download.html

Scroll down to the link "Get Manual" and download the schematic. Note that it has several pages of parts list preceeding the schematic.

Next, put a 150 Watt incandescent bulb in series with the power cord to act as a current limiting fuse. Now replace the fuse and proceed with testing. You may find that one or more filter caps have shorted. Also pay particular attention the the BIAS power supply. You should see about -35 to -40 volts. Note that the series lamp will come on if excess current is being drawn and voltages will be low if the lamp lights. If the BIAS supply has failed, it is possible your power tubes have been damaged.

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I have the Peavey Millenium BXP 5 string bass and apparently, at my last gig, I must have plugged into the wrong cord because after that I could not get the bass volume to work. I'm not sure if I blew out...


Here is the contact info you need:http://www.peavey.com/support/contactinfo/ Tell them the problem and they will advise you as to whether or not you will be able to repair it yourself. Without troubleshooting it myself I would guess that there is a part blown in the preamp circuit. I don't know for sure but if it involves a surface mount component the circuit board may have to be replaced if there is one.

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The output stage has a problem. From your description, I'd guess that the high voltage supply has failed. The low volume and distortion suggests that you are trying to power the speakers from the driver section rather than the outputs. There is a resistor that fails in some of this series. If I remember correctly it is either a 2K or 3K resistor 10 watts in size. If you have no experience with repairs, I'd seek a service shop that is familiar with these units. The part runs between $5-$10.

Dan

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Ive been through this. Although it certainly appears to be a ceramic capacitor, its actually called a polyswitch. .65 amp. Parts express carries them. Part no. 071-256.

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