[Collins] Transistor Question

[Dave Brown]

Thank for the tubester info, Pete- been looking for that for some 
time- I had it all here a few years back but it's disappeared 
somewhere!
 There seems to be a problem with page 15-redirects to adverts. Might 
be just me???----

73
 Dave, ZL3FJ

----- Original Message ----- 
From: "pete wokoun, sr." <pwokoun at hotmail.com>
To: <collins at mailman.qth.net>
Sent: Sunday, July 03, 2005 12:10 PM
Subject: Re: [Collins] Transistor Question


> 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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>>
>
>
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