[Collins] Transistor Question

[pete wokoun, sr.]

Hello List,
  I just recently stuck the circuits from my tubesters onto my website.  You 
can find them at:

http://www.qsl.net/kh6grt/page4/tubesters/tubesters.htm

For some of the house number semiconductors, I was guessing at their 
function since, like Jerry said, you can't find equivalents or even data for 
them anywhere.

73s, pete KH6GRT


>From: Gerald <geraldj at ispwest.com>
>To: collins at mailman.qth.net
>Subject: Re: [Collins] Transistor Question
>Date: Sat, 02 Jul 2005 17:46:07 -0500
>
>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
>
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