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Hartke HS1200 Problem

B

boxerboxer

Jun 29, 2009
2
0
MN, USA
#1
I know this isn't a super DIY-oriented place but I figure there must be a few guys on here who might know a thing or two.

My friend brought over the Hartke because he said when he turned it on, there would be a hum and the speaker would stick out further forward than normal when no signal is present. I opened it up and did a visual inspection, and cannot see anything that looks obviously wrong. However, when powered on, one of the output transistors starts smoking.

I have two questions:
1. Does anyone have a schematic of this amp? I know I can pay 10 bucks and get one but I'd rather avoid that if I can.

2.Where should I go from here? I don't think replacing the output device will help much until the reason for the smoke is found and addressed, so I'm a little stumped.

Ben
 
#2
Firstly Ben, you did not fill out your profile so we have no idea where in the world you live. This means we can give you no recommendations for where to go for parts and schematics.

Pay the $10 for the schematic, if you know how to read one, it's money well spent. The amp has a simple diagnosis: problem in the output stage. What is causing that problem is why techs get paid.

Paul
 
#3
BassmanPaul said:
Firstly Ben, you did not fill out your profile so we have no idea where in the world you live. This means we can give you no recommendations for where to go for parts and schematics.

Pay the $10 for the schematic, if you know how to read one, it's money well spent. The amp has a simple diagnosis: problem in the output stage. What is causing that problem is why techs get paid.

Paul
Click to expand...

Thanks for the reply. I hear what you're saying about letting people with the know-how do the work. In this case I will end up doing exactly that. The reason I pursued this in the first place is I'd love to get to the point where I AM the guy who knows what to do. It's tough because in my town there are only a couple guys who do that sort of work, and none of them (at least ones I know) seem real eager to share that information, so I just take any opportunities I can to try to fix things and ask around online for things beyond my own limited knowledge. Not the best way to learn this stuff but my options are few.

Ben
 

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