1956 Zenith 18C24Q VIDEO DETECTOR DIODE?

[ctc17]

Im not familiar with that specific set, but I have run accross several bad video detector diodes.
You can NOT use a 1n4004 and it will not test like a 4004.
A 4004, using diode test on a multi meter will read about .500-.600mv, the diode thats in there is Germanium and will read .200-.300mv one direction and open the other direction.
You may be able to use a modern silicon detector diode, the 1n4004 is not even close to high enough frequency to work as a detector.

When they fail they cause a whole bunch of weird problems depending on if they get leaky, short or open. Everything form buzzing and sync issues to poor color performance and ghosting.

I have been using 1N34 or 1N60 as a replacement for these. They are a germanium diode and work just fine.

I just looked on ebay and you can buy these numbers for like 10 for $1

[Tubejunke]

I am bringing back another old thread as I am TRYING to get some things fixed since you can't hardly give away a nice old set it seems. I would like to thin my collection or radios and TVS if anyone can pick up in southern VA. Anyway, in the interim I need to know if I can by a replacement detector diode somewhere besides Ebay. I mean are they still sold by parts suppliers like Mouser or Digikey etc? Any thoughs on this. I have to obtain something to move forward...

Originally Posted by ctc17

Im not familiar with that specific set, but I have run accross several bad video detector diodes.
You can NOT use a 1n4004 and it will not test like a 4004.
A 4004, using diode test on a multi meter will read about .500-.600mv, the diode thats in there is Germanium and will read .200-.300mv one direction and open the other direction.
You may be able to use a modern silicon detector diode, the 1n4004 is not even close to high enough frequency to work as a detector.

When they fail they cause a whole bunch of weird problems depending on if they get leaky, short or open. Everything form buzzing and sync issues to poor color performance and ghosting.

I have been using 1N34 or 1N60 as a replacement for these. They are a germanium diode and work just fine.

I just looked on ebay and you can buy these numbers for like 10 for $1

[Phil Nelson]

Is this what you want?

http://www.mouser.com/catalog/specsheets/1N34A.pdf

Mouser sells a 10-pack for $6.70.

http://www.mouser.com/ProductDetail/...34PYwAg51eESs2

Phil