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- - CT100 info (http://www.videokarma.org/showthread.php?t=252386)

rcafan

10-17-2011 07:50 AM

CT100 info

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

10-17-2011 10:14 AM

Why, have they gone bad?

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

grimer

10-17-2011 10:28 AM

Quote:

Originally Posted by rcafan (Post 3016315)

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

10-17-2011 12:03 PM

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

10-17-2011 12:51 PM

Quote:

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

10-17-2011 01:06 PM

Some times they short and relese toxic selenium gas.

reeferman

10-17-2011 05:42 PM

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

old_coot88

10-17-2011 06:18 PM

Quote:

Originally Posted by Penthode (Post 3016325)

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

They develop reverse leakage also.

Geoff Bourquin

10-17-2011 11:33 PM

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

10-19-2011 10:56 AM

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

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