REPAIR SHOP 

 

Repair of Peavy CS800X 600W PER CHANNEL AMPLIFIER

 

Fault - Dead blows fuses  

Stripped the amplifier down found that all output transistors had blown on channel A

Cleaned up heatsink, replaced all the output transistors and drivers with matched MJ15025/MJ15024 devices, at 250v 250W these are more powerful than the original Peavey components fitted*, also fitted new pre-drivers MJE350/MJE340 as can be seen on the left of the heatsink.

See also the bias diodes in the heat sink looking like little loops of copper wire.

*Peavey have the annoying habit of using own part numbers on standard components fitted in their products presumably so they can charge twice the price for replacements. 

Refitted fan tunnel assembly

Note how the air is funnelled on to the output devices and the different size of heatsinks front to back 

Rebuilt amplifier ready for test, note the old output transistors in top right hand of picture 

Tested unit - both channels @400w RMS  - all ok 

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