Brad H wrote:
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?

Whatever you do it won't be cheap unless you get incredibly lucky. And you will
also need luck to find a drop-in panel meter.

Other than that, it should be easy to find a rectifier and meter for your
ratings, just watch ebay for awhile. Not too many buyers need those specs. When
you get your rectifier, take the time to find the actual datasheet, download it,
and read it for the manufacturer's suggestions on mounting especially heat
sinking, and use new heat sink grease. If you have to retrofit a new panel meter
with a slightly different footprint it isn't too hard to cut out panels with a
jeweler's saw, or else make a bunch of punches along your profile and then use a
small sanding drum in a Dremel tool (or carbide burr in a die grinder, or...) to
clean up. You can also chain drill, although I hate drilling sheet metal.

GWE