CT100 info

[rcafan]

Has any body replaced the selenium rectifier in the
CT100 with diodes?Info appreciated.

What's the name of the parts house in Pennsylvania
That carries a great deal of old stuff. I think it
Starts with an M

[miniman82]

Why, have they gone bad?

You're thinking of http://www.surplussales.com/

[grimer]

Originally Posted by rcafan

What's the name of the parts house in Pennsylvania
That carries a great deal of old stuff. I think it
Starts with an M

Moyers -----> http://www.moyerelectronics.com/Depa...-TV-Parts.aspx

[Phil Nelson]

This previous thread discusses the selenium issue.

Looks like the votes are about evenly split between replace vs. leave alone. FWIW, the previous owner of my CT-100 did replace the seleniums. If you replace 'em, disconnect the old unit completely (that is, don't wire the diode in parallel).

Regards,

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html

[Penthode]

If you replace 'em, disconnect the old unit completely (that is, don't wire the diode in parallel).

Why not? The seleniums when they go, don't they simply open (go high resistance)?

[Electronic M]

Some times they short and relese toxic selenium gas.

[reeferman]

Believe it. I've experienced shorted selenium(s) clearing out a shop.

[old_coot88]

Originally Posted by Penthode

Why not? The seleniums when they go, don't they simply open (go high resistance)?

They develop reverse leakage also.

[Geoff Bourquin]

I had once case where a selenium smoked real bad, and the only thing that went open was the windows, and they stayed open for about a week

[jeyurkon]

If you use them, fuse them.

I've had good luck with old test equipment and radios that use them, but not in TV's where they see higher loads.

John