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Output Transistors? [message #18433] Fri, 15 March 2013 09:01   Yooperdan Messages: 29 Registered: May 2010 Location: Da U.P. Junior Member I took a couple of old tube amps in to be repaired by the "tube amp guru" here in SE Mi. I asked if he would put 3-pronged cords on a couple of Kustoms for me since I was bringing a couple of amps in for him to work, he said he really doesn't work on SS but said he would do that for me as well as clean the pots, etc. He did my Frankie () and my 25W combo and after he put the cord on the combo, he hooked it up and was cleaning pots and had the (bear with me) oscilloscope hooked to it and said I have a couple of bad output transistors. I said transformers he said no transistors. He showed me the oscilloscope and it only had the top half of the sine wave. I never thought the combo sounded right and even swapped the speaker in it. Opinions? Thanks much for any input. Kustoms forever! Slowly rockin' on, Yooperdan Report message to a moderator

Re: Output Transistors? [message #18440 is a reply to message #18433] Fri, 15 March 2013 12:14 chicagobill Messages: 2005 Registered: April 2003 Senior Member I don't know if the output transistors are the cause, but that's not an uncommon problem in guitar amps. It's like you took one of the two power tubes out of a push-pull amp, like a Deluxe. A very odd sounding distortion. It could be a problem with one of the output transistors, or a problem in the driver stage of the amp. It could even be a simple cold solder joint and a loose resistor. Whatever the problem is, it shouldn't be that hard to find or expensive to repair. Report message to a moderator

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