I need Solid State help - A solid state man in a tube world - Jemsite
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post #1 of 6 (permalink) Old 07-26-2001, 07:31 PM Thread Starter
 
Join Date: Dec 2000
Location: Austin, Texas
Posts: 209
I need Solid State help - A solid state man in a tube world

I use Solid state amps ( don't preach I've had every tube amp you can imagine and I'm sticking with the solid state) I use 80's Ampeg SS model amps. I have two SS 150 heads, two SS 70 combos and a ss 140c head. The two ss 150 heads work great, but the ss 140c head and one of the combo's have both lost the second channel. When ever I switch to the clean channel there is no sound no matter how loud I turn it up, on both amps. On the other combo the volume on the distortion channel is so loud even when turned all the way down. I need help. Does anyone know any good solid state amp repairs guys. All I can find is tube amp guys.AHHH! :help: *also if anyone knows of any solid state amp book please let me know.



(Edited by jem7pbk at 9:34 pm on July 26, 2001)
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post #2 of 6 (permalink) Old 07-26-2001, 09:33 PM
 
Join Date: May 2001
Location: Cary, NC
Posts: 306
I need Solid State help

How technically savvy are you? *Solid state boards can be harder to work with because many new chips are soldered directly to the board, whereas tubes can be "easily" pulled from their sockets. *I had a problem with my old Crate because the distortion channel stopped working. *After some snooping with an oscilloscope, I discovered that the 1458 op-amp was blown in the pre-amp ckt. *I unsoldered it, and replaced it with a socket, then plugged a Radio Shack 8-pin IC in... presto! *It works!
If you don't find any of the obvious problems (loose wires, cold solder joints, burnt components), you're probably looking at a dead IC somewhere. *-Andy
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post #3 of 6 (permalink) Old 07-26-2001, 09:38 PM
 
Join Date: May 2001
Location: Cary, NC
Posts: 306
I need Solid State help

1. *For the 2nd channel being totally quiet, the signal is not getting through. *You may have a dead component and the area that takes the most abuse is in the pre-amp area of the board. *I'd start looking there.
2. *For the "all loud all the time" distortion, check your volume pot or check for shorts on the board around the volume control.
General Tip: *Your best circuit board troubleshooting tools are your eyes.
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post #4 of 6 (permalink) Old 07-26-2001, 10:12 PM Thread Starter
 
Join Date: Dec 2000
Location: Austin, Texas
Posts: 209
I need Solid State help

Great thanks. I'm gunna give'em a look over.
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post #5 of 6 (permalink) Old 07-26-2001, 10:37 PM Thread Starter
 
Join Date: Dec 2000
Location: Austin, Texas
Posts: 209
I need Solid State help

Hey Andy would it be ok if I email you some pics of what I have found and maybe you can help tell me what it is and if its suppose to be like that.
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post #6 of 6 (permalink) Old 07-26-2001, 11:43 PM
 
Join Date: May 2001
Location: Cary, NC
Posts: 306
I need Solid State help

Sure, I'd be glad to help. *Also, it looks like you can get schematics from their 800 number under Service at
http://www.ampeg.com


(Edited by bachle7 at 10:49 pm on July 26, 2001)
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