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

phil fortime at bellsouth.net
Tue Aug 11 03:05:21 UTC 2009


Jim, try this link http://octopart.com/info/RCA/2N1701 that first vendor has 
them for 5 bucks each, I didn't check shipping.

Get someone you know stateside to buy them and post it to you if you are not 
in US. The above vendors don't have many, but I noticed other vendors with 
15,000 plus in stock. It's readily available.

Phil



----- Original Message ----- 
From: "Jim Palfreyman" <jim77742 at gmail.com>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Monday, August 10, 2009 10:36 PM
Subject: Re: [time-nuts] HP 106B quartz frequency standard...the story


Hi Phil,

100% agree. I'm not going to risk a substitute - especially in the crystal 
oven.

Unfortunately, check out http://www.americanmicrosemi.com/Shipping/
and see they will charge me US$69.99 which is AUS$100 for posting a
single $8 transistor!

The cheapest I have found so far is down to US$22 postage for a single
transistor.

Regards,


2009/8/11 phil <fortime at bellsouth.net>:
>
> ----- Original Message ----- From: "Dave M" <masondg44 at comcast.net>
> To: <time-nuts at febo.com>
> Sent: Monday, August 10, 2009 10:10 AM
> Subject: Re: [time-nuts] HP 106B quartz frequency standard...the story
>
>
>>> 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 would not use a "cheap" general replacement transistor in a direct 
> coupled
> unit unless it was absolutely positively the last one on earth. Many 
> vendors
> have that 2N1701 in stock from 7 to 8 bucks American. We have repaired
> thousands (no exaggeration) of units that all that was wrong is where
> incompetent technicians used general replacement transistors rather than 
> the
> originals in direct coupled amplifiers.
> http://store.americanmicrosemiconductor.com/2n1701.html
>
> Phil
>
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