I have a Crate PA-8 that hasn't been used in a long time. I destress and sing. Anyoo it has a power issue. Light is flashing on then goes off. I can't find a manual. Can anyone assist me please?

It is a very simple amplifier and the pa4a is similar.

https://www.scribd.com/doc/55465995/Crate-PA-6-Manual
https://www.scribd.com/doc/55465995/Crate-PA-6-Manual

Looks like Q24 changes the gain at IC4-A from low with no input jack to normal gain with a jack inserted. Since this appears to be a guitar amp that expects a floating input plug any connection at the input to say, a mixer etc may cause a re-grounding via that equipment's circuits, thus negating the auto mute...... eggs & suck :-) If using a moving coil meter it could upset things.... an interesting fault! Sorry I can't be more help - Good luck!

remove top screws by handle.

You trying to fix it or sell it ?

Contact Crate customer service at this link
http://www.crateamps.com/support/index.php

Perhaps these loinks will help-
25 000 terabytes of music videos and posts http://www.crateamps.com/support

This is a warm up issue and can probably best be found by using circuit cooler on suspected components.

Other possible problems may be a bad solder joint or cracked circuit board.

Candle the board with a bright light to look for cracks.

Bad solder joints take experience to spot, but pay particular attention where panel mounted volume controls solder to the circuit board. Looking for the little ring around the solder menicus takes a sharp eye and good lighting. Resolder any suspected bad joints.

150 watts should be easily handled by four Peavey speakers in the connection you described.. If the Peavey's are 8 ohms, then your total load was 8 ohms for the series/parallel arrangement which is well within the 2 ohm drive capability of the Crate according to specs.

I question if you really mean the speakers were in series? This requires a special cable to do this. Now if you mean they were "daisy chained" like the amp went to one speaker and another cable connected that speaker to another, then you REALLY had ALL speakers in parallel electrically which would be at the 2 ohm low limit of the amp... In either case, with only 1/4 of the 150 Watts to each, the speakers should NOT have been damaged. The amp MAY have been damaged. Try each speaker individually at a REASONABLE level to test.

If you plug into the effects loop out jack,OFTEN the connection to the internal power amp is broken so you might have to arrange a special cable as a wye to go back into the power amp as well as your external amp. In any case pwere ALL interconnected amps, etc from the same power source/receptacle for system safety.

Hi

The problem is with the amplifier itself. Crackling is usually capacitor related and you will need to have the amp checked over to properly identify the cause.

Some amps are also prone to pick up static from other electrical items which can also cause these problems. I had a crackling issue with an old Crate amp of mine which turned out it was due to being too near a computer/monitor so it is worth eliminating these things as a possible cause before having the amp checked.

Hope this helps. Thanks for using FixYa.