Up for sale here is this cute little vintage rectifier, probably selenium but I don't know for sure. This came from a 1957/58 piece of Knight tube gear, and is marked RR 8J3781. It is guaranteed to work. Please see my pictures for details and measurements.

US shipping and handling is $5, and international is $18, no matter what quantity you buy. All my small parts are set up for combined shipping, so just use the "add to cart" feature and then check out all at once, and it will combine shipping. If you have any questions, please ask.

I have more great vintage electronics listed--feel free to take a look!