2009/8/7 David C. Partridge :
> I'c curious, what is so strange about the pass xistor in the PSU that you
> can't replace it?
Getting one.
So far I've found places with $300 minimum buys.
However, as I write I can get one for $30 including postage to
Australia. Still expensive.
Unless anyone ha
In a message dated 08/08/2009 09:53:35 GMT Daylight Time,
jim77...@gmail.com writes:
Getting one.
So far I've found places with $300 minimum buys.
However, as I write I can get one for $30 including postage to
Australia. Still expensive.
Unless anyone has a 2N1701 lying around?
Two quest
I meant with something not original that meets the specification ...
Surely the specification can't be that extreme?
D.
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Jim Palfreyman
Sent: 08 August 2009 09:53
To: Discussion of precis
Jim,
I have a few old Fairchild transistors that would drop right in.
They are AY9139 60V 4A Beta ~50 PNP Si. Much the same as 2N1701.
Let me know and I'll pop some i the post.
Max VK3YBA
- Original Message -
From: "Jim Palfreyman"
To: "Discussion of precise time and freq
In a message dated 08/08/2009 10:39:50 GMT Daylight Time,
ms...@bigpond.net.au writes:
I have a few old Fairchild transistors that would drop right in.
They are AY9139 60V 4A Beta ~50 PNP Si. Much the same as 2N1701.
Let me know and I'll pop some i the post.
My data indicates the
In a message dated 08/08/2009 09:53:35 GMT Daylight Time,
jim77...@gmail.com writes:
Unless anyone has a 2N1701 lying around?
Hi Jim
Going back through the archives I see you're about three volts high on
that power rail, certainly more than I 'd expect through normal t
gandal...@aol.com wrote:
In a message dated 08/08/2009 09:53:35 GMT Daylight Time,
jim77...@gmail.com writes:
Unless anyone has a 2N1701 lying around?
Hi Jim
Going back through the archives I see you're about three volts high on
that power rail, certainly more than I
In a message dated 08/08/2009 11:56:59 GMT Daylight Time,
mag...@rubidium.dyndns.org writes:
Please also note that it is not necesserilly that transistor which could
be bad, but the driving curcuit may have gone bad.
Exactly:-)
___
time-nuts ma
Jeez, this is not rocket science !
This instrument is old enough to have used the common "Allen Bradley" carbon
composition resistors of that day. These puppies are famous for changing value
due to humidity without ever passing any electrons through them.
If the voltage is relatively close and t
gandal...@aol.com wrote:
In a message dated 08/08/2009 11:56:59 GMT Daylight Time,
mag...@rubidium.dyndns.org writes:
Please also note that it is not necesserilly that transistor which could
be bad, but the driving curcuit may have gone bad.
Exactly:-)
In one case, the buffer transi
OK folks, I've rechecked the voltages and here's the details.
Firstly, changing the oven temperature screw was a mistake. Read a
previous thread to see why I did it. It was logical given my
experience with 10811 ovens. I've owned up to it and begged
forgiveness from the great Flying Spaghetti Mons
Hi Jim,
YES, please email me the schematics.
thank you
BillWB6BNQ
wb6...@cox.net
Jim Palfreyman wrote:
> OK folks, I've rechecked the voltages and here's the details.
>
> Firstly, changing the oven temperature screw was a mistake. Read a
> previous thread to see why I did it. It was logica
And one more request, please measure and tell me what the values are for
the base of the pass element and any driver transistor connections.
Also, it may be that the power supply is really a current source for
charging the batteries. The power supply and the instrument may need
the batteries to
Hi Jim,
I'd be happy to see what's up with your 106B.
Could you please email me the manual, or let me know where I can
download it?
Thanks,
Adrian
Jim Palfreyman schrieb:
OK folks, I've rechecked the voltages and here's the details.
Firstly, changing the oven temperature screw was a mistake
Speaking of carbon comp resistors that change value... If you have any Tek
S-xx sampling heads for the 7000 series scopes that are not working (almost
always shows up with a flat trace off the top or bottom of the screen, visible
with the beam finder) the problem is usually that one or more
As has been pointed out, my post intended for the group didn't reach
it. It is answering the question as to WHY I fiddled with the oven
temperature. Here it is:
Well I can give you an answer - but it doesn't change anything :-)
Oh great flying spaghetti monster, forgive me f
The 2N1701 is a general purpose transistor rated at 60V, 2.5A. Problem is it
is in a TO-8 package. You probably won't find an exact replacement as this
package is rather rare. You should be able work in a TO-220 or smaller
packaged device. NTE lists a cross reference for the device. Watc
I don't have the prints, but suspect there is not an IC opamp in the
regulator. The unit is too old. IMO, it's more likely to be built out of
discrete parts. You might therefore look for a leaky capacitor also.
-John
===
> The 2N1701 is a general purpose transistor rated at 60V, 2.5A.
Jim,
shit just happens ;-)
Thanks for the manual.
Apparently the +18 V supply on the outer oven controller A1A4 is faulty.
The 17.4 volts are just 18 V - Vbe.
Read 4-42 and check the circuit on fig. 5-8.
The series regulating transistor is Q9.
Check voltages on Q7, Q9 first.
Adrian
Jim Palfrey
If it's an older germanium PNP pass transistor then yes, rest assured, it is
leaky and needs to be replaced with a modern silicon part. Germanium power
transistors don't age well.
-- john, KE5FX
> -Original Message-
> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on
Jim Palfreyman wrote:
OK folks, I've rechecked the voltages and here's the details.
Firstly, changing the oven temperature screw was a mistake. Read a
previous thread to see why I did it. It was logical given my
experience with 10811 ovens. I've owned up to it and begged
forgiveness from the gre
Magnus,
yes, but there are two Q3 transistors on the same schematic. I think Jim
is talking about the other Q3 that is in the upper right corner of fig.
5-12, and is marked 2N1701. It's just there to generate +17.4 (and +7)
from the +24, and is controled by the +18 V regulator in the oven assy
I just bought an HP 105B Oscillator. It's doing something that may or
may not be a problem. I'm hoping that someone can help me out.
It's a newer unit that's based on the 10811 oscillator plus two
interface boards to adapt the 10811 to the rest of the 105B circuitry.
Does anyone have a soft
Likely yes, but check the spec. If the output circuit is a low Zout buffer
amp and two separate roughly 50 Ohm resistors, they should be independent.
Or, two distinct buffers could be used too.
You can do a simple check with an Ohmmeter, with the unit powered OFF.
Measure the R between the front a
Thanks for the reply John.
J. Forster wrote:
Likely yes, but check the spec. If the output circuit is a low Zout buffer
amp and two separate roughly 50 Ohm resistors, they should be independent.
Or, two distinct buffers could be used too.
Ah yes, the spec that's in the manual that I don't hav
> Thanks for the reply John.
>
> J. Forster wrote:
>> Likely yes, but check the spec. If the output circuit is a low Zout buffer
>> amp and two separate roughly 50 Ohm resistors, they should be
>> independent.
>> Or, two distinct buffers could be used too.
> Ah yes, the spec that's in the manual th
John,
J. Forster wrote:
Thanks for the reply John.
J. Forster wrote:
Likely yes, but check the spec. If the output circuit is a low Zout buffer
amp and two separate roughly 50 Ohm resistors, they should be
independent.
Or, two distinct buffers could be used too.
Ah yes, the spec t
Hi again,
I do have a HC manual for an older 105B (bought about 30 years ago) but
can't access it at the moment.
> The 105B is one of the products that Agilent sold to Symmetricom which
> means that they don't have any info on it. Of course, Symmetricom has
> no info on the 105B on their site.
I uploaded the 106 manual I scanned last week to Didier's web site.
It's about half way down at
http://www.ko4bb.com/cgi-bin/manuals.pl?dir=HP_Agilent .
(It's a pdf and you have to skip over the folders to get to the items that
are in a single pdf.)
Stan
-Original Message-
From: time-nut
Hi Ed,
IIRC it's normal for the circuit check meter readings to behave "squirrelly"
as you've described for the 3 output checks. I think this function is pretty
much only to "crudely" show that you have (or don't have) each output.
As for your 100kHz & 1MHz dropping-out when you load your 5MHz
Hi Stan,
Is it possible to do a very high resolution scan of the manual ?
thanks,
BillWB6BNQ
Stan Searing wrote:
> I uploaded the 106 manual I scanned last week to Didier's web site.
> It's about half way down at
> http://www.ko4bb.com/cgi-bin/manuals.pl?dir=HP_Agilent .
> (It's a pdf and
This is not strictly time-nuts related, but I know there are a lot of
folks here who have and use HP surplus equipment. I have an
opportunity to buy an HP 62615M switching power supply. It is rated
15VDC @ 40A. I have it adjusted to 13.8VDC. I have Googled, checked
the Agilent site and BAMA, but ca
See the December 1973 HP Journal for an article on these and some specs.
I have only used the 28V version.
Be careful when testing despite the fact that the test procedure
requires it, they dont like starting into a short circuit (at leas the
one I used didn't and took out all the switching devic
Hi Greg,
Greg Burnett wrote:
Hi Ed,
IIRC it's normal for the circuit check meter readings to behave "squirrelly"
as you've described for the 3 output checks. I think this function is pretty
much only to "crudely" show that you have (or don't have) each output.
It's not exactly 'time nuts'
> The 2N1701 is a general purpose transistor rated at 60V, 2.5A.
I've mentioned this before, but it bears repeating.
If you are having trouble with an old school linear power supply, in
many cases you can replace the TO-220 PNP pass transistor *and* the
reguatlor circuit (based on a 723 or wh
Thanks for the tip. I managed to find the HP Journal Archive and
download that issue. It describes the "J" version, which I presume is
older. The pictures certainly look quite a bit different.
Nevertheless, that article does help.
You mention a test procedure. Do you have a copy you can email me?
christopher hoover wrote:
> > The 2N1701 is a general purpose transistor rated at 60V, 2.5A.
>
> I've mentioned this before, but it bears repeating.
>
> If you are having trouble with an old school linear power supply, in
> many cases you can replace the TO-220 PNP pass transistor *and* the
> regu
The circuit is so simple and has so few parts, I'd be inclined to unsolder
the transistors and diodes and test them. It should take less than a half
hour with a Pace solder sucker or equivalent.
If there are bad transistors, you could likely bend the leads of a TO-220
part the fit the PCB and add
Not any more, I only remember the spectacular results it produced.
Basically one just tests the output voltage dc and ripple as a function
of the dc current.
There was also a test that involved shorting the output to check the
short circuit current.
They probably changed the design after I demonstr
My impression is that the 10811 update to the 105A/B is just the OCXO. HP
apparently decided to standardize on one oscillator for frequency units and
therefore created the three-board assembly (one to condition power, one to
divide and condition the signal, one to hold everthing together) as a '
Weather projections for California this winter are WET, which implies local
power failures (lasting up to perhaps eight hours).
What do time-nuts do for backup power? I have one of the TAPR TBolt systems
along with numerous other toys (OCXOs that should probably be kept running to
avoid retrace
Power boat stores have deep cycle batteries as well as nice plastic
battery cases and terminal adapters. I prefer them to car batteries and
gel cells.
-John
> Weather projections for California this winter are WET, which implies
> local power failures (lasting up to perhaps eight h
> Weather projections for California this winter are WET, which implies
> local power failures (lasting up to perhaps eight hours).
> What do time-nuts do for backup power? I have one of the TAPR TBolt
> systems along with numerous other toys (OCXOs that should probably be
> kept running to avoi
In message <8cbe6c4bbd8ad2a-6d8-3...@webmail-dg14.sim.aol.com>, gsteinb...@aol.
com writes:
>What do time-nuts do for backup power? I have one of the TAPR TBolt
>systems along with numerous other toys (OCXOs that should probably
>be kept running to avoid retrace errors). Automobile batteries? UPS
I use a 100 pound APC UPS (Smart-UPS 2200XL) that I was given a few years
ago. I suspect it will run a thunderbolt for a month. Check eBay and you
can probably pick one up cheap.
-bob
On Sat, Aug 8, 2009 at 10:55 PM, wrote:
> Weather projections for California this winter are WET, which impli
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