Originally Posted by leadlike (Post 1932634)

kx250rider- I live in central pa, about two hours outside of philadelphia. This seems to be a dead zone for old tv stuff, as I have never seen any for sale here. Lots of nice old radios, though; which is something I am much more knowledgeable about.

I did find this ebay seller who has a number of 21'' tubes. If anyone thinks there is a match here, your help would be greatly appreciated. Hopefully the link won't get too muddled, but the seller has a store called The Old Radio.

http://stores.ebay.com/The-Old-Radio...dZ2QQpZ2QQtZkm

I see for instance he has several crts that have the proper deflection stats and the like, but the pinout is different, and I don't think that any of them require an ion trap, which mine does. So with his 21cxp4 for example, would I disconnect pin six (g4) and use the ion trap (after making the anode pins line up properly of course) instead?

Originally Posted by eberts (Post 1933569)

It's sad to watch these old TV repairmen go senile.

Originally Posted by electroking (Post 1933851)

Thanks for this lead!

I just bought a 21DMP4, which is given as an exact substitute for my
21DEP4. The guy was also listing a 21CBP4, which would have been
a good substitute for my 21ALP4A, but he found the wrong tube in
the box and had to remove the listing. The search continues.
Cheers to all!