[time-nuts] HP 10811 update

[Mark C. Stephens]

Sorry mate, this isn't much help, I haven't heave of any of these, must be before my time?!



 Mat

 Struct

 Pc

 Ucb

 Uce

 Ueb

 Ic

 Tj

 Ft

 Cc, pF

 Hfe

 Caps

1.

2N6429<http://alltransistors.com/transistor.php?transistor=5816>



 Si



 NPN



 0.625



 55



 45



 6



 0.2



 175



 100



 3



 400



 TO92

2.

NTE2341<http://alltransistors.com/transistor.php?transistor=44370>



 Si



 NPN



 1



 100



 80



 7



 1















 2000



 TO92

3.

NTE46<http://alltransistors.com/transistor.php?transistor=44457>



 Si



 NPN



 0.625



 100



 100



 12



 0.5















 10000



 TO92

4.

NTE48<http://alltransistors.com/transistor.php?transistor=44458>



 Si



 NPN



 1



 60



 50



 12



 1















 25000



 TO92

5.

SM2285<http://alltransistors.com/transistor.php?transistor=45948>



 Si



 NPN



 1



 0



 100



 0



 0.2



 200



 150







 600



 TO92

6.

STL73D<http://alltransistors.com/transistor.php?transistor=50901>



 Si



 NPN



 0



 700



 400



 0



 1.5















 0



 TO92

7.

STX112<http://alltransistors.com/transistor.php?transistor=50927>



 Si



 NPN



 0



 100



 100



 0



 2















 1000



 TO92

8.

STX616<http://alltransistors.com/transistor.php?transistor=50930>



 Si



 NPN



 0



 980



 500



 0



 1.5















 0



 TO92






-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of paul swed
Sent: Thursday, 25 July 2013 11:29 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP 10811 update



Well learned quite a bit Q4 does have an issue. Further there is a reason it has such high Beta. Its must deliver 30 ma to the oscillator and buffer.

I was quite surprised by this current level. I was  guessing the oscillator was a few mils and the buffer maybe 8.

The 2n3904 simply does not cut it. Need to do some digging in the ole transistors.

Regards

Paul.





On Wed, Jul 24, 2013 at 8:06 PM, paul swed <paulswedb at gmail.com<mailto:paulswedb at gmail.com>> wrote:



> I can hope

> I will embed a k thermocouple also.

>

>

> On Wed, Jul 24, 2013 at 7:45 PM, Bob Camp <lists at rtty.us<mailto:lists at rtty.us>> wrote:

>

>> Hi

>>

>> The regulator should be fixed, and the OCXO will work better with it

>> repaired. That said, shifting the regulated voltage from 5.7 to 5.27

>> volts should not shift that oscillator 45 Hz.

>>

>> Bob

>>

>> On Jul 24, 2013, at 9:00 AM, paul swed <paulswedb at gmail.com<mailto:paulswedb at gmail.com>> wrote:

>>

>> > Hello to the group. Numbers of threads running on the HP 10811.

>> > Mine is

>> 45

>> > Hz low. The oven is most likely ok. I did get the can open per the

>> various

>> > other threads and the web pix. Started testing the circuits and

>> > have

>> found

>> > that the regulator for the oscillator isn't. Its supposed to

>> > produce

>> 5.7V

>> > and is at 5.27V thats pretty significant. The transistor looks like

>> > a shorted collector base junction. Though I do not have it out of

>> > circuit yet. Its Q4 a 2n6429. What interesting about this

>> > transistor is its

>> beta at

>> > 1 ma is 500 min and max is 1300. Its not a darlington. Thats pretty

>> > amazing. I am looking through my xsistors to find something close.

>> > May

>> just

>> > through a 2n3904 in for a quick test. Its beta is nothing like the 6429.

>> > But it would help to prove/disprove the point that the low V may be

>> > offsetting the oscillator I hope.

>> > Will also embed a K thermal couple to verify the oven really is in

>> > the 80-84C region.

>> > Regards

>> > Paul.

>> > WB8TSL

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