Revox B760 tuner power supply problem

Archived from groups: rec.audio.tech (More info?)

I have an old Revox B760 tuner which I aquired second hand quite a
while ago. This fantastic piece of equipment worked beautifully for a
while, but recently has developed some kind of power supply problem.

The moment I try to power it up, the 250mA user accessible fuse blows
(the one next to the voltage selector; there are a number of other
fuses embedded inside the box, but these are not easily accessible).

Does anyone have experience of tinkering with this model of tuner and
be able to give me some pointers as to how to go about repairing it
(or if necessary, getting it repaired). Alternatively, does anyone
know where I could get hold of a service manual for this tuner.

Having recently upgraded my amp, I am very keen to get the tuner
working again to really hear it perform!

Thanks for any help.

David
--
Dr David Lindgren <dave@kites.org.uk>

Archived from groups: rec.audio.tech (More info?)

In article <coic9a$hb6$1@hercules.btinternet.com>, Gareth Magennis wrote:
> First of all, are the 250mA fuses you are using slow-blow? Fast blow ones
> may blow straight away with the initial inrush current and there may be
> nothing wrong with the tuner.

Thank you *very* much. You have saved me quite a lot of time poking
around with a multimeter. Turns out that by putting a slow blow in
instead of simply replacing the fast blow that I pulled out of the
thing originally, everything is okay.

I had been wondering whether a capacitor in the power supply had
failed and was causing a short.

Now I just have to replace all the failed lamps, and fix the analogue
meters (which have never worked since I aquired the tuner), and the
thing will be perfect.

David
--
Dr David Lindgren <dave@kites.org.uk>