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Topics - ohmy!!

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Amplifier Discussion / Peavey XXL repair!
« on: August 04, 2010, 04:43:30 PM »
So I scored a Peavey XXL head for $75, but the kicker is there's something wrong with the power section.  The guy I bought it from said a tech quoted him $60 to fix it so I was hoping it's nothing too major like the autoformer that's in there. I've not really worked on solidstate heads much so I'm going to need some pointers on what's up with this.  The preamp works fine, I'm running it into my Heritage VTX's poweramp (which I just fixed prior to getting the xxl  :tu: ) at the moment. It sounds good through it, but I would like to fix the head due to the fact that it has this nice power switch on the back so I could kick it down to 25watts to practice in my bedroom late at night.  Here's what's going on though.  It doesn't output any sound through the speakers.  When I turn the volume up all the way and set it to the ultra channel though I can hear it very very faintly playing (and whining type of sound), but not through the speakers, something in the head itself possibly the autoformer? I don't know if that's possible but yeah that's what's going on, seems really odd.  Any ideas from anyone out there?  I've got no clue where to start.  Usually checking the fuses is the first thing if there's no sound I thought, but they're all fine.

Tubes and Hybrids / Peavey Heritage VTX ..uh oh..
« on: July 08, 2010, 04:28:32 PM »
Hey guys, I'm having an issue with my VTX.  It was working fine until the other day.  It started sounding really bad and I had looked at the tubes and one of them was out completely.  So, naturally, I got a new set of the same tubes that were in there and have been in there for a few years (Sovtek 6L6WXT+).  I had plugged them in and started it up, after about 2-3 minutes of it being on it makes a loud pop and then nothing but loud humming.  I check the tubes, 2 of the tubes are glowing insanely bright red.  I flip it off, unplug it and check the fuses later.  One of the fuses had gone, I went ahead and replaced all of them, filter caps look fine.  So I figured maybe those two tubes were bad, I went through and swapped tubes between each plug and the same two plugs cause the tubes to get real hot and lots of loud humming going on.  So I unplug those 2 tubes, turn it on and it's working, no humming.  Any tubes I plug into those 2 spots get red hot and cause it to hum very loud.  I'm not sure if there's a bad resistor anywhere or what's going on. Any help would be appreciated.  I snapped off a picture for you guys to see it.

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