[time-nuts] 5370A

[Magnus Danielson]

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
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at lists.febo.com
>> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
>> and follow the instructions there.
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.