[time-nuts] 5370A

[paul swed]

Hello to the group I diid put together a strange replacement for a counter
some time ago.
I used the typical 1016 ecl chip. But the real chips a lot more clever than
that. As I recall the slicing level also goes into that chip. I remember
its was more complicated than I had thought.
Regards
Paul
WB8TSL


On Wed, Feb 10, 2021 at 10:59 AM Magnus Danielson <magnus at rubidium.se>
wrote:

> Hi,
>
> This was to some degree out of necessity that they had to design some
> chips to meet their needs, but as it was done "in house", it was also an
> opportunity to get ahead competition. They have done some pretty strange
> chips through the day. They often had a separate article in HP Journal
> to show off how cool they where. Finding that for the 5370A (and 5345A)
> may be a good start in addition to the manual.
>
> As I recall, isn't the input board of the 5370A actually the same as for
> the 5345A? It may be shared with more counters. Yes, it is, I checked
> the 5370B manual. So that then increase the potential donor range.
>
> With a bit of head-scratching, I think that one should be able to find
> sufficiently equivalent functionality in more modern chips, and some of
> the head-scratching to retro-fit it, which meets a bit of challenge also
> to maintain signal integrity.
>
> Cheers,
> Magnus
>
> On 2021-02-10 15:06, Bob kb8tq wrote:
> > Hi
> >
> > The gotcha with pretty much all HP counters is that the front end
> > chips are non-standard. In some cases they are part of a multi chip
> > module that is non-standard.
> >
> > Option one is to find a parts donor on eBay and transplant the front
> > panel of your 5370, 5334, 5335, 53131,53230 …. and fix it that way.
> >
> > Option two is to build up something that isn’t quite the same and
> > see if you can cram it in the space available. I seem to recall this
> > working better on the 5370 than on the 5335.
> >
> > Back when you *could* get service on them (like the 1980’s), a blown
> > channel on a 5335 was a $1150 repair bill. They replaced the entire
> front
> > panel PCB. Even HP service could not get “that chip” to simply replace
> > the blown input device.
> >
> > Bob
> >
> >> On Feb 10, 2021, at 7:27 AM, Herbert Diensthuber <kern1578 at hotmail.com>
> wrote:
> >>
> >> Hi all
> >> Sorry to say but I just managed to damage one of the input channels of
> my trusted HP 5370A.
> >> If someone could get me pointed in the right direction where to get or
> purchase the input IC amplifier I would very much appreciate it.
> >> Comments or replies please send them to my email!
> >> Thank you very much
> >> Herbert
> >>
> >>
> >> Sent from my iPhone
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