[Peter Wieck]

Sherman Webers wrote:
Greetings,

I have recently purchased a used Cary SLP-90. The unit worked perfectly for
the first day I had it and sounded great. No issues whatsoever. I left the
unit in the Standby mode for about 4 hours yesterday and now it will not
transfer from standby to operate. I seem to be getting 12v, 6.3, B+.

It could be a bad switch or relay if the B+ supply is relay-operated.
That switch (or relay) carries a great deal of voltage with the
consequent arcing when made or broken. I would expect that it would be
a high-wear part. How did you verify that you had B+, by the way?

With the amp UNPLUGGED and COLD, you could go inside and check. If it
is a switch, look for scorch or carbon marks around it. Perhaps
scraping it clean would suffice for the moment. If a relay, does it
unplug? You may be able to replace it as simply as that.

STANDARD WARNING: Lethal voltages exist inside this amp. DO NOT screw
around inside unless you are awake, aware and knowlegable of the
conditions.

Unless you *KNOW* what you are doing, do not try to verify B+ on your
own. If you do. then try to see if B+ gets as far as the switch (or
relay). If B+ does not exist, then check the rectifiers or rectifier
block. This thing uses SS diodes for the purpose. If you get no AC to
the rectifiers, then a transformer (winding) has smoked, unlikely but
possible. Again, if you have already verified B+, most of the above is
redundant. Look at the changeover switch (or relay).

Peter Wieck
Wyncote, PA