Watts - Volts and Resistance

The '535' and '675' must be power-CONSUMPTION amounts. The '4 Ohm Max.' must mean that power compumption is while the unit is delivering maximum power into 4-Ohm speakers.

Those numbers have nothing do to with the audio-power output.

Why not connect it to some speakers and hear if it delivers enough clean-sounding output?
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Thanks for the replies.
I hokked up the receiver(I think it was made in 1976), and beleive me that I'm sure it delivers a lot moer than 20 or 30 wpc. I'm driving a pair of 3 way floorstanders that play loud and I can't get past 40 % of the volume, it's just too loud.
It sounds quite nice for an old receiver !!!

Rgds.

As I recall, the Quad receivers from the mid '70's were only good for 20-30 wpc [max] into 8 ohms. Quad was a format disaster, and Quad amps were only produced for 2 or 3 years. You should be able to about double that power into 4 ohms, but bass damping and the amp's stability might be a problem with a 4 ohm load. What are you using for speakers? Do you know their efficiency? Can you bridge the 4 channels into 2 channels?

El, I agree with your logic but how did you get 133 is 50% of 535?

The 40% of volume is misleading as most receivers of that ilk are going full blast well before the volume control is at 100%. It was a marketing trick to make you think it can play louder than it really can.

Foxtrot, If you are hokking up recievers you may want to see a doctor :>)

I got this piece for 10 bucks what harm could it make, and it looks as if it's just got out of the factory.
I just hooked it up to a spare pair of sepakers I have, it's not intended for critical listening or anything like it, I think it's future is more decorative than musical. An yes, I can use only two channels if I want to.

Rgds.