>> Something I forgot to note was that this instrument (the 4261A) was
>> actually manufactured for HP by Yokogawa, I'm not too sure where the
>> HP part ends and the Yokogawa begins, maybe it was designed by HP and
>> built by Yokogawa, or maybe the whole thing was a contracted design
>> for HP by
Something I forgot to note was that this instrument (the 4261A) was
actually manufactured for HP by Yokogawa, I'm not too sure where the
HP part ends and the Yokogawa begins, maybe it was designed by HP and
built by Yokogawa, or maybe the whole thing was a contracted design
for HP by Yokogawa.
Y
>The y have used Fairchild for their source.
>
>If so, that explains the high rate of failure.
>
>Years ago when at Intel, we disqualified Fairchild
>
>as a source for parts because of the poor testing
>
>and high failure rates.
>
>Dwight
I seem to remember the 7474 that failed was actually a TI p
curiousma...@gmail.com
Sent: Thursday, August 11, 2016 12:12:14 AM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: the value of old test and repair equipment
For some reason the 7474's have a higher failure rate than other TTL IC's in HP
equipment. I don't know if it&#x
For some reason the 7474's have a higher failure rate than other TTL IC's in HP
equipment. I don't know if it's true in general for 1970's TTL. Signetics MSI
chips (counters and stuff) seem to be prone to failure too.
Marc
>
> All this talk of older test equipment reminds me of the HP 4261A L
On Tue, Aug 9, 2016 at 10:31 PM, tony duell wrote:
> The problem is that one of the 300 baud Bell tones is effectively the
> same as (I think) the long-distance clearing signal. Something like that
> anyway. If you connect your 300 baud US modem over here it will
> effectively cause the exchange t
> > Since a Bell modem would cause a lot of problems on an old
> > UK phone line,
>
> Why is that? Are the electrical characteristics of the phone line
> actually that different from US lines?
Electrically the lines are almost identical (there are differences in things
like ringing voltage and f
On Sat, Aug 6, 2016 at 11:56 PM, tony duell wrote:
> Since a Bell modem would cause a lot of problems on an old
> UK phone line,
Why is that? Are the electrical characteristics of the phone line
actually that different from US lines?
I worked for a modem company for a few years, though I mostly
>I really like my old test gear and yes, it just seems right to be restoring
>vintage computers with vintage instruments. HP scopes, logic analyzers,
>DVMs; function generator; Tek scope, frequency counter; as well as just
>'sundry'. But I did break down and buy a DDS frequency generator to work
glue a broken
>
> switch wafer. I tried some super glue but it didn't
>
> hold. I'm going to try JB weld next.
>
> Dwight
>
>
>
> From: cctalk on behalf of drlegendre . <
> drlegen...@gmail.com>
> Sent: Friday, Aug
opic Posts
Subject: Re: the value of old test and repair equipment
"I've been restoring a HeathKit capacitor checker."
Which one, the IT-28? Those are really handy for finding leakage in
high-voltage caps, as they have a crazy-high (like 600V ?) power supply.
Unlike modern SS uni
> Though I have some background in Telcom, I'd never heard of the HP 3370(B)
> so had to check it out. Here are a couple of take-away quotes from a
> thread at: http://www.vintage-radio.net/forum/showthread.php?p=866814
Did you also notice that one of the contributors to that thread goes
by the
Though I have some background in Telcom, I'd never heard of the HP 3370(B)
so had to check it out. Here are a couple of take-away quotes from a
thread at: http://www.vintage-radio.net/forum/showthread.php?p=866814
"The A suffix boxes were designed to test phone lines for modems for CCIT
standards
I also collect old/classic test gear. Some I use (my main
'scope is a Tekky 555, I think that's old enough to be a
classic :-)). Some I just collect because it's a beautiful
piece of electronics. My latest find was an HP3770B
telephone line analyser -- an instrument to measure the
freqeuncy resp
; isk...@uw.edu>
> Sent: Sunday, July 31, 2016 3:46:13 PM
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: Re: the value of old test and repair equipment
>
> I really like my old test gear and yes, it just seems right to be restoring
> vintage computers with vintage i
the two layer impact paper.
Dwight
From: cctalk on behalf of Ian S. King
Sent: Sunday, July 31, 2016 3:46:13 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: the value of old test and repair equipment
I really like my old test gear and yes, it
I really like my old test gear and yes, it just seems right to be restoring
vintage computers with vintage instruments. HP scopes, logic analyzers,
DVMs; function generator; Tek scope, frequency counter; as well as just
'sundry'. But I did break down and buy a DDS frequency generator to work
on m
In fact, the value of old test gear varies tremendously..
Vacuum tube testers of certain makes & models are near the top of the food
chain, with clean, working examples pulling $1500+ (USD) on a very regular
basis.
There's also a strong following for much 'classic' audio analysis gear (HD
meters,
Yes, quite interested, HP test equipment is a significant part of my
collection. Most of what I get is untested. Would need model number and photos
of course.
Marc
Sent from my iPad
> On Jul 28, 2016, at 12:52 PM, Electronics Plus wrote:
>
> I had to pass up a large qty of old test equip at t
At 03:52 PM 7/28/2016, Electronics Plus wrote:
>... does as-is old test and repair equip that won't be particularly cheap have
>interest to you guys?
It depends entirely on the make and model of equipment. I always have a laundry
list of stuff I am looking for - one of the reasons why I bring m
I enjoy using vintage test equipment as well, but I'm not usually willing
to pay more than $5 or $10 for a piece unless I know it works. Generally,
the only time I'll pay more without testing is when it's an automated piece
of equipment that included some computer interface capability as part of
as
Cindy wrote...
-
does as-is old test and repair equip that won't be particularly cheap have
interest to you guys?
-
Speaking just for me personally... yes it has interest. I use period gear to
work on the computers and enjoy that combination. Not as in "I'm collecting
old test gear" but "
I had to pass up a large qty of old test equip at the recycler last time
because they wanted too much for it. For instance, an old HP signal
generator would have cost me $25, with no way to test it, and no guarantees
that it was complete or working. So my question is, does as-is old test and
repair
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