On Fri, 16 Apr 2004 11:43:39 +0100, Jim Lesurf
wrote:

In each case I tend to switch the speaker energisation and DAC power on in
the morning, and off at the end of the evening. I have a slight impression
that the speakers (and maybe the DACs) benefit from this.

The manual for the Quad '57 speakers recommends leaving them powered
all the time and not switching them off. Is the advice given for the
'63/988/989 different?

My Stax electrostatic headphones sound noticeably 'edgy' for the first
few minutes after switch-on. I have not investigated this in any
detail, but it seems reasonable that high-impedance capacitive systems
will need a little time to stabilise because there may be some fairly
long time constants associated with the biasing supply.

This would tie in with the instructions Quad provide for monitoring
the HT bias supplies of the '57 in which they specify the use of an
electrostatic volt meter because the input impedance of a standard
meter is sufficiently low to affect the reading. (Of course in those
days, the majority of meters were not electronic.)


--
Chris Isbell
Southampton
UK