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Repair of Cloud VTX 750

  

Fault -  Channel B in protection mode

 

 

 

This amplifier was in a bit of a state cosmetically with channel A volume knob missing

 

 

After a  a good clean out and blast from the air line, the insides of the amplifier can now bee seen unfortunately the amplifier has 2 boards mounted one on top of the other and the faulty board is on the bottom

 

As can be seen bellow both boards now removed leaving the PSU and transformer and fan. 

 

See both boards on the bench

 

Checked the output Mosfets - all ok, after some fault finding found a leaky transistor in the VA Stage - on the left below the blue preset 

 

Replaced both the transistors in the VA stage 2 x MPSA 43  with 2  x matched MPSA 42 which have a higher voltage rating, reassembled the amplifier and  tested all now ok. 

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