Having owned four pairs of 57's and now on my second pair of 63's I can tell you it is not plain sailing by any means. My previous pair of 63's held up well considering they hadn't been properly serviced in a couple of decades.

That's what I thought I'd be getting with a freshly serviced pair, another long stretch problem free, but no, they are Quads and things go wrong.

Nearly all my 57's developed issues after a time. I did just sell a pair which were freshly refurbished and perfect, but I needed the money.

Why do I do this and continue this madness you scream!? Well they DO do things no other speaker can.

I've tried Martin Logan's, Maggies etc which come close but haven't quite got what I want. Okay I haven't heard the mega £££ electrostats (probably a good thing) but quads are usually cheaper than their "competition" in the second hand market.

If they are refurbished properly they can last but they can also go bad without warning or reason.

That said my issues are only on very bass heavy tracks and at relatively high volume. 90% of the time the issues aren't audible. I guess what I'm saying is that I agree with Howard, who's right to be apprehensive but, done properly and if prepared for some back and forth until they are perfect, it is worth the effort.

I can imagine the pairing with the Krell being absolutely stonking.