[Collins] Transistor Question

[Gerald]

On Sat, 2005-07-02 at 17:35 -0400, Merle wrote:
> Hello to the list.
> 
> I have a transistor I can not identify, wonder if anyone on the list has the information on this guy..??
> 
> It is out of a " tubester "  that some people used in their Collins radios back a while ago.
> 
> The numbers on it are: AT 5058 and on the other end of it is another number T 1402C or it might be TI  402C  anyway it is not in any of my reference books ! Any help would be appreciated.
> 
> 73 and thanks
> Merle W1GZS
>  
Without looking in older reference books, I'm fuzzily recalling that the
AT 5058 was the high voltage transistor essential to the tubester
operation. It went out of production with no comparable part being made
anywhere in the world (much like the US made double gate MOSFETs) which
caused tubesters to go out of production. With nothing comparable it
won't show in modern cross reference lists.

Tubester circuits and parts lists were published in QST once upon a
time. I'm sure that QST is here somewhere.
-- 
73, Jerry, K0CQ, Technical Advisor to the CRA
All content copyright Dr. Gerald N. Johnson, electrical engineer