In article .com, Brad H
says...

I need to replace the selenium rectifier stack in an old battery
charger to bring it back to life. The battery charger is rated at
7.5V-80Amps dc and 14.5V 50Amps DC. It is set up with multiple primary
windings selected by a switch. I verified that the transformer is
good.
Does anyone have a recommendation for a good replacement rectifier
diode set that will handle this current? Will I have to use separate
diodes and build it to get 80Amp capability?
The amp meter is also shot, and I might entertain replacing that if its
cost effective. Any ideas on a small 2" x 2" panel mount 80A dc meter?

You can replace the Se unit with any silicon bridge, or make one
up from individual diodes - as long as you keep the 80 amp number
in mind. Go to digi-key and search.

You can replace the amp meter with any small milliameter by using
a shunt formed from a short piece of smaller gage copper wire.
Some experimentation required for that. It will be easier to find
a small milliameter like that then a surplus 80 amp meter.

Jim


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