On Sunday, April 30, 2017 at 5:30:25 PM UTC-5, philo wrote:
On 04/30/2017 04:06 PM, Ralph Mowery wrote:
In article ,
says...



When working a large motor speed control quit. The factory repair main
replaced 2 large diodes. There were 3 of them as this was a 3 phase
system. I asked him to replace the 3 rd one. He said they were $ 50
each. I told him I don't care as it was costing up about $ 1000 an hour
to be down plus your charge to come back in if needed. It may not need
changing, but why take the chance.

Someone brought me a power supply for a very high end film scanner.
It has four bridge rectifiers two of which had been replaced a while
back. One of the original ones is bad but I'm going to replace the
still-good original one as well. They are about $8 each.

**Are you sure they are Diodes' and not the Triacs

Yes, they were diodes. They were probably for over 100 amps. About as
big around as a half dollar, one end had screw threads about 3/8 inch in
diameter and a brade with a large lug on the other end.

They are 35 amp bridge rectifiers

that look like this

http://www.mcmelectronics.com/produc...FVg9gQodV1gP6Q


Dang that brings back a lot of memories! I was buying a lot of parts from MCM in the late 1970's and into the 80's. I used to pour over the catalog like it was a toy catalog but there were numerous electronics parts stores in town at the time. I'm not sure how many stores have survived but there are still a few around. Good grief I remember what I had to go through to do mail order. The Internet was SciFi back then. ヽ(ヅ)ノ

[8~{} Uncle Nostalgia Monster