N Cook wrote:
In a valve Dansette Bermuda of early 60s
Been in a loft for years.
The mains wiring is perished and other wiring looks dodgy so testing some
things cold first.
Using 9V battery and 300 ohm dropper shows near enough 9V over the
rectifier, how high V do you have to go with a good one to check it ?
Are there safety grounds anyway for changing to a 1N4007 or so ?
Single element rectifier
Siemens lazy S logo
Made in Germany
2250c50
Kc 0.6e 11/16


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
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Ask in rec.antiques.radio+phono...or just google the subject in that
forum. It's been discussed at length. The general outcome is that yes,
you should replace the selenium with silicon. It's prone to self
destruct, and if it does, it emits nasty--some say toxic--fumes. (IOW
the magic smoke contained therein can harm you.)

There is a greater voltage drop across selenium. A series resister
should be added to compensate, calculated according to average B+
voltage/current.

jak