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Roc pro 700 fuse always breaks

Hello the fuse is always breaking i replaced the darlington power transistors( motorla)tip 142 and tip 147 (where shorted)by tip142 and 147(italian made )the amp worked for 10 min (the transistors where to hot )and shorted again ,then i replaced them with
( St )tip 35cand tip 36c this time the amp worked for 15 min can someone help with this? i checked all the resistors can u help me plz by giving me the exact equivalent transistor for the tip 142 and 143? what do you think the problem is?

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SOURCE: my amp breaks up too

colearthur16, Only a slight chance of problem with your speaker. You will need to prove that all stages of amplification of the audio signal from input to output are not being driven into distortion (clipping) because of a bad DC power supply rail to the low level amplifiers or the high power "final" output amp! To prove this, you will need the help of an electronics technician who has access to a variable audio signal generator (amplitude and frequency) and a cheap 5 to 20 megahertz oscilloscope to view the amplified waveforms of the amplifier stages in the Fender Amp. Remember the following statement for the rest of your life!!! "All musicians who use electronic amplification to play musicial notes through speakers should have between 4 and 8 hours of classroom instruction on how typical amplifiers (tube and solid state) operate and how to troubleshoot them when they fail to perform to rated specifications!!!"
Cole, have the Fender amplifier (not the speaker) tested by a qualified technician to prove amp is not at fault!!! 12fixlouie

Posted on Nov 08, 2010


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