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

[Don Latham]

Also, the following:
http://www.sphere.bc.ca/test/
is one of the best spare parts sites for test equipment that I know of.
they're good folks.
Don

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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>>
>> _________________________________________________________________
>> Get free photo software from Windows Live
>> http://www.windowslive.com/online/photos?ocid=PID23393::T:WLMTAGL:ON:WL:en-US:SI_PH_software:082009
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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