This guitar amp is blowing resistors. I am kind of Thinking outputs are shorted. J162 Output transistors. I kind of thought they worked like diodes. I am getting current flow in both directions on 2 of 6 of them. Any body lead me to database for Datasheets? I need to convert shematic from PDF to upload.
http://www.datasheetcatalog.com/
You are right about the diode-like working. If you disconnect them and get conitinuity in both directions the transistors need to be replaced. Check the driver transistors as well. They often blow together with the output transistors.
You don't need to convert from pdf to upload as long as the file size remains within the limits.
If you have no possibility to make the pdf small enough, take a screenshot and upload that as jpg. How to take a screenshot? Push Ctrl + Print at the same time. Open a graphic viewer (e. g. Paint or IrfanViewer) and paste the screenshot in (Ctrl + V). Edit the picture as necessary and save it as jpg.
You can upload files up to 100k, I think. If they are bigger you can host (google picture hosting) them somewhere and post a link.
You are right about the diode-like working. If you disconnect them and get conitinuity in both directions the transistors need to be replaced. Check the driver transistors as well. They often blow together with the output transistors.
You don't need to convert from pdf to upload as long as the file size remains within the limits.
If you have no possibility to make the pdf small enough, take a screenshot and upload that as jpg. How to take a screenshot? Push Ctrl + Print at the same time. Open a graphic viewer (e. g. Paint or IrfanViewer) and paste the screenshot in (Ctrl + V). Edit the picture as necessary and save it as jpg.
You can upload files up to 100k, I think. If they are bigger you can host (google picture hosting) them somewhere and post a link.
J162
Can't seem to copy and paste for now but the datasheet database is great. It'll keep me busy for a while. Thanks so much.
Can't seem to copy and paste for now but the datasheet database is great. It'll keep me busy for a while. Thanks so much.
Amp
Amp has 3 K1058s and 3 J162s for output. One of the J162s had an open resistor on its output. All six transistors are paralleled to speaker + except the one that was open. The leg of the resistor was open I am guessing that would cause other 5 to overworking causing the original problem or I wonder if I didn't disturb it myself
Amp has 3 K1058s and 3 J162s for output. One of the J162s had an open resistor on its output. All six transistors are paralleled to speaker + except the one that was open. The leg of the resistor was open I am guessing that would cause other 5 to overworking causing the original problem or I wonder if I didn't disturb it myself
Tube heater
Should heater voltage be DC. Heater connections are mark - and + but I am seeing 13 VAC. I am wonder if rectifier is bad and that is causing problem.
Should heater voltage be DC. Heater connections are mark - and + but I am seeing 13 VAC. I am wonder if rectifier is bad and that is causing problem.
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