[CW] CW Keyer Interface

[Lee]

Does anyone on here know of an available keyer interface (built or in 
kit form) to interface a modern ss keyer to a cathode keyed 
transmitter?  Something good for 800 volts @ around 300 ma or more? I'd 
also use it with a semi-automatic bug to get the high voltage and 
current off of the bug or straight key.

I found one that would work nicely on "Ham Gadgets" home page, but when 
I went to order one, a flag popped up saying it was not in stock.  (UKA-3+)

All my modern keyers around here are OK with QRP rigs and the newer 
transceivers, but they can't handle cathode keyed transmitters. Right 
now I'd like to use my Eldico TR-75 TV transmitter as I had one as a kid 
back in 1953.  I think I need an interface to use my keyer.

Anyone have any suggestions.?

Lee, w0vt