Re: Estimating transformer voltage for B&K CS117 preamp

On Mar 14, 4:05 am, "N Cook" <diver...@xxxxxxxxx> wrote:
powerdoc<dkingl...@xxxxxxxxxxxxxx> wrote in message

news:1173829050.816283.47650@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

I have a CS-117 with a defunct transformer. The factory won't sell me
parts and the value of the unit will be exceeded by the repair costs.
Is there a way to estimate the value of the ac output (it looks like a
center - tapped output with 3 wires) so I can get this back on the
road?

Before throwing out the original , excavate under the covering and you may
find an o/c thermal fuse.

Connect a dual ps to the 2 main DC rails and slowly up the volts until
reliable operation and then add 20 percent or so and divide by 1.34 or
whatever for AC volts

Totally demolish the transformer, counting turns/ weighing /gauging the
wire, then using the formulae to discover the likely output V and I.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list onhttp://home.graffiti.net/diverse:graffiti.net/

The voltage regulators are 15v and electrolytics are 40v. I figure
that the transformer is prob 36v. c.t. with a fractional amperage.
Will try that with a variac and see how it works.

.

Relevant Pages

  • Re: Estimating transformer voltage for B&K CS117 preamp
    ... powerdoc wrote in message ... parts and the value of the unit will be exceeded by the repair costs. ... center - tapped output with 3 wires) so I can get this back on the ... Connect a dual ps to the 2 main DC rails and slowly up the volts until ...
    (sci.electronics.repair)
  • Re: Estimating transformer voltage for B&K CS117 preamp
    ... parts and the value of the unit will be exceeded by the repair costs. ... 25% regulation transformer. ... Top voltage limit will be dictated by margins & cap rating. ... If 25% transformer regualtion and 10% mains overvoltage get us to 40v, ...
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