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

Don Latham djl at montana.com
Mon Aug 10 01:15:33 UTC 2009


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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