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

Dave M masondg44 at comcast.net
Mon Aug 10 14:10:31 UTC 2009


> 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.
>>

Jim,
The NTE sub for the 2N1701 is the NTE152, available from Mouser and many 
other suppliers.  According to the datasheet, it's in a TO-220 case.  If you 
want to try to find a sub in a smaller package, here are some of the 
pertinent specs for the 2N1701.
NPN Silicon
Vcbo = 40V
Ic (max) = 2.5A
Pd = 25W
Hfe = 20-80 @ 300ma/4V
Vsat = 1.5V @ Ic=300ma, Ib=30ua
Iceo = 750ua @ 60V
Ft = 350KHz

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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