[time-nuts] HP 106B quartz frequency standard...the story

[Jim Palfreyman]

Hi all,

The transistor in my unit (not a 4B model!) is 1854-0015. Lots of those.

If someone can confirm this is identical to 1854-0003 I'll use it.
Otherwise I may have to take up one of the very kind offers!

On the 2N1701 - it has to be in a T08 package. This transistor sits in
a special heat sink that is bolted to the oven wall. So unfortunately
I can't substitute.

Regards,

Jim


2009/8/11 ron hunt <resolver99 at hotmail.com>:
>
> Hi!I Have The Exact 1854-0003 HP Part.If You Still Need It I Will Be Happy To Send It No Charge.I May Need Some Help Some Day.Let Me Know Your Shipping Address.
>
>> Date: Sun, 9 Aug 2009 19:15:33 -0600
>> From: djl at montana.com
>> To: time-nuts at febo.com
>> Subject: Re: [time-nuts] HP 106B quartz frequency standard...the story
>>
>> carefully crack open the old to8 can to expose the leads internally, strip
>> out the old transistor and cobble the to220 on top with appropriate leads.
>> The to220 should fit under one of the old mounting screws? one direction
>> will give the base and emitter connections properly.
>> Don
>> Jim Palfreyman
>> > Thanks for that! - I do have a number of the 5254L units and one of
>> > them is now being eyed off for organ donation. So thanks to all offers
>> > for the 1854-0003.
>> >
>> > The 2N1701 in a T08 is my next quest...
>> >
>> > 2009/8/10 Dave M <masondg44 at comcast.net>:
>> >>> Hi all,
>> >>>
>> >>> Latest update.
>> >>>
>> >>> With some help and phone calls from Bill the fault seems to have been
>> >>> isolated. I have removed Q11 from inside the oven and it is cactus. Q9
>> >>> is also very suspect so I'm going to replace that for good measure.
>> >>>
>> >>> Q9 is a 2N1701 in a T08 package. Thanks to various people I should be
>> >>> able to track one down. Q11 is marked as 1854-0003 and that's an HP
>> >>> internal number and all I know. Might have to substitute that one.
>> >>>
>> >>> After all this I have some quality photos and can knock up some good
>> >>> descriptions of the repairs and the 106B internals if anyone is
>> >>> interested. Any websites hanging around that want to take what I have?
>> >>>
>> >>> Regards and thanks to all!
>> >>>
>> >>> Jim Palfreyman
>> >>>
>> >>>
>> >>
>> >>
>> >> Jim, the 1854-0003 is a pretty common HP part in older eqpt. If you
>> >> have
>> >> junked 5245L counter handy, it's full of them, especially in the decade
>> >> counter PCBs. If you don't have one handy, I have an assembly here with
>> >> 8
>> >> of them on it. If you like, I can send it right away (if you're outside
>> >> the
>> >> USA, you pay postage).
>> >>
>> >> Dave M
>> >> masondg44 at comcast dot net
>> >>
>> >> I went to a bookstore and asked the saleswoman, "Where's the
>> >> self-help section?" She said if she told me, it would defeat the
>> >> purpose.
>> >>
>> >>
>> >>
>> >>
>> >>
>> >> _______________________________________________
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>> >
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>>
>>
>> --
>> Dr. Don Latham AJ7LL
>> Six Mile Systems LLP
>> 17850 Six Mile Road
>> POB 134
>> Huson, MT, 59846
>> VOX 406-626-4304
>> www.lightningforensics.com
>> www.sixmilesystems.com
>>
>>
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