[time-nuts] HP 10811 update

[paul swed]

NTE is actually a conglomeration of old parts cross reference stuff. Mostly
from the TV and radio days. They consolidated the consumer lines of
Motorola HEP, RCAs SK, and Sylvanias ECG lines to fill out the replacement
device business.

Thats when things could be repaired. So thats the reason the 123a can cover
a wide range. Its sort of  a cross of a cross sort of fits thing.
Don't get me at all wrong with these comments. Glad they are around. But it
is the reality.
Regards
Paul
WB8TSL


On Thu, Jul 25, 2013 at 9:50 AM, J. L. Trantham <jltran at att.net> wrote:

> Very interesting list.
>
> I wonder if that is a way to identify a cross from a manufacturer's P/N
> (Tek, HP, Fluke, etc.) to a 'real' part?
>
> Either that or all you need is a collection of NTE parts and never anything
> else :).
>
> I have used NTE parts to cross to 'unobtanium' in the past and, so far,
> it's
> worked.  However, my first choice is a 'new' item followed by 'NOS'
> followed
> by 'used' then 'anything that will work'.
>
> Joe
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Orin Eman
> Sent: Wednesday, July 24, 2013 11:01 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] HP 10811 update
>
> I find it hard to believe that NTE spec the 123AP to replace a transistor
> with min beta of 500...
>
> This is quite entertaining:
>
> http://www.vetco.net/catalog/product_info.php?products_id=1856
>
> Look at the parts it's supposed to replace.
>
> (Nothing against Vetco - they are a great source of NTE components and are
> local to me.  They are just quoting what NTE claim.)
>
> Orin.
>
>
>
>
> On Wed, Jul 24, 2013 at 8:42 PM, J. L. Trantham <jltran at att.net> wrote:
>
> > The 2N6429 crosses to an NTE123AP, in stock at Allied for $0.80.
> >
> >
> > http://www.alliedelec.com/search/productdetail.aspx?SKU=70214870&mkwid
> > =szEc5
> >
> > jMBI&pcrid=23468365337&pkw=nte123ap&pmt=e&pdv=c&gclid=CKyzu9_cybgCFWYV
> > 7AodJA
> > sAWQ
> >
> > Good luck.
> >
> > Joe
> >
> > -----Original Message-----
> > From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]
> > On Behalf Of paul swed
> > Sent: Wednesday, July 24, 2013 8:29 PM
> > 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> 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> 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> 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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> > >
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