[R-390] R-390 Rectifier Stack Replacement

[Flowertime01 at wmconnect.com]

Rich,

CR801 is a selenium stack. Selenium stacks have had a bad rep since the 
silicon diode has been invented. The magic smoke in these items is known toxic.

The stack provides DC for the antenna relay for break-in.

If you are not using your receiver with a transmitter then you do not need 
this feature to work. Thus you can just open the AC leads to the critter and 
leave it.
Its just one option.

New old stock replacement parts are still available if that's your preferred 
restoration methodology. Ask for one here on the reflector in another posting 
if you want one.

The preferred replacement is just a 50 volt 1 amp or more silicon bridge.
Unsolder the old Selenium stack.
Drill a hole in a block of plastic or wood. Then trim the block down to size.
The hole will mount on the original bolt.
Glue the new bridge to the block.
Orient the pins to stick up. and the bridge top against the chassis.

Then you have a part that bolts in.
And you can reattach the existing wires to the bridge.
Spread the leads out into a fan if needed or offset then it needed.
Trim then short to fit into the chassis space.

It will take more time to make the block up for the mounting than to do
the new part install.

Check those 47 OHM resistors while you are in the deck.

Roger AI4NI   </HTML>