Ha, ha, very optimistic price. The Quartets (hateful speakers, bright and nasty with a horrible nasty metal dome tweeter), usually go for £150 to £250 in good condition with the woody stands. The amps are more interesting, but it's only the power amp, so worth £300 tops. Amps probably worth £450 to £500 for the pre/power, not sure who originally made the amps, but it wasn't Heybrook.
The Sextets are much, much better, don't bother with Quartets is my view. You can still find Sextets for £250-ish.
This i find odd, i used to own the previous pre/power , it is a 3 box affiar, and certainly IS made by heybrook, i was going to get it serviced, they was happy to undertake this job, i chose not to in the end, but it certainly WAS heybrook that made mine, inside some of the large caps even had ''heybrook'' printed on them ?
Please would you try to think who originally made them, because if it wasnt heybrook, id love to know. :^
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The amp is ok though..But, a bargain was missed in the DJ section a while ago for a full Heybrook stack: