Hi,im in trouble with one chanel of this amp,when i get this amp the B channel has repared, i use it for a while and the B chan burn (litteraly with sparks fog etc etc),so i fix it with motorola MJ15022/23 for the output replace bad R's drivers etc and it go good in bias& offset ,again go on fire after two hours ,but this time under" ligth load" (listen in livingroom),i realize that the MJ's are fake,again replace everyting bad but this time whit ON SEMI's parts direct from they, everyting ok bias etc and...again on fire....after few hours low volume etc etc.i got new parts and i m ready to go again but i m looking for advice (or a good fire stinguisher).so please if any can help....
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may be some oscillation
= unstability, which in the end will corrupt the output and overload it
This can have several reasons.
- The input filter capacitance can not stop RadioWaves from enter amp
- The compensation capacitance is too low (small caps to reduce HF gain)
- The Zobel output filter is not working. 1 cap + resistor across output.
One question:
When you turned on the amp, after changing Transistors,
how hot was the heatsink, close to Output Transistors?
Without any signal at input.
= unstability, which in the end will corrupt the output and overload it
This can have several reasons.
- The input filter capacitance can not stop RadioWaves from enter amp
- The compensation capacitance is too low (small caps to reduce HF gain)
- The Zobel output filter is not working. 1 cap + resistor across output.
One question:
When you turned on the amp, after changing Transistors,
how hot was the heatsink, close to Output Transistors?
Without any signal at input.
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