hifi engine

Quad 66 Pre Amp power up failure

My 66 will not power up. It seems the stand by relay failed. This happened about 10 years ago and was repaired by QS&D. They have closed shop, anyone know of a quality repair source or of a parts supplier. I am in the Dallas, Tx area.
Paul



Re: Quad 66 Pre Amp power up failure

Apology, before serial number 210600

Paul

Re: Quad 66 Pre Amp power up failure

Hello Paul,

I'm living in europe and therefore I can't tell you a repair source in your area.
I can only advice you to check IC 303 which is a LM387 voltage regulator for the CPU. ( only if the serial number is below 21600 ) and the solder joints on both sides of the main/control board.
This are the most common issue's with the QUAD 66 preamp ( pre serial number 21600 ).

I hope it will help you.

Regards
Paul

Re: Quad 66 Pre Amp power up failure

Have you checked the capacitors in the power supply? C308 is 1000uf; it may be bad.