On Ebay such a beast is for sale, but what is it?
We get a lot of questions about this offering. Can you do that? Yes we can (maybe), but we won’t. See comments.
Can you also glue new capacitors on old ones, and leave corroded trimmerpot's in to place to maximise the profit? Do you also falsify graphs to proof your point? Yes we can, but we don’t.
The claimed 80W RMS in 8 Ohm is easy done, remove the regulated supply, ignore the fact why Quad did design this in the first place, and run the amp on an unregulated 90V supply voltage.
The second part, 160W RMS in 4 ohm is a lot more difficult, if possible. Our advice: check before you buy it, if the unit really deliver this kind of power. RMS, two channels, not peak-to-peak.
Why don’t we do this kind of work?
We work within the Quad design philosophy. We only upgrade and improve things if they really matter and are necessary because of modern speakers and sources.
If you need a 160W in 4 Ohm, buy a 520 series or a 606, 707 and 909. But remember, you need ten times the power to hear a sound at twice the original volume.