[time-nuts] 5370A vs 5370B

[Don Latham]

Hi Bob: sounds as if it just had a hard bump, meaning that all the boards 
and connectors need reseating. I had an Hp device with a tiny crack in a pc 
trace on the motherboard, but by golly I found it. Hope the B doesn't prove 
to be a sequential vortex :-)
Don

----- Original Message ----- 
From: "Bob Camp" <lists at rtty.us>
To: "'Discussion of precise time and frequency measurement'" 
<time-nuts at febo.com>
Sent: Tuesday, March 09, 2010 10:08 AM
Subject: Re: [time-nuts] 5370A vs 5370B


> Hi
>
> Ok, the rest of the story:
>
> I picked up a 5370B for less than the price of the 10811 inside it. The 
> unit
> powers up and appears to function at some level. All of the front panel
> knobs are either busted or sheared off. Switches and buttons all seem to 
> be
> there and function (2 minute quick check).
>
> I have it on a 3 day right of refusal. Popping the top to look inside 
> voids
> that (at least I believe it does). Shipping there and back is roughly half
> of what I paid for the unit.
>
> 5370A's are pretty common out there. 5370B's not so much so. If I keep 
> this
> unit I'm trying to calibrate just what sort of adventure I'm getting 
> started
> on. I already have a number of them going on.
>
> The goal is still to get this one up and running by "repairing" the front
> panel pots. With 4 of them to fiddle that may or may not work out. Ideally
> I'd like to have a 5370B when I'm done. Since A's are all over the place,
> swapping parts with an A to get the B going is what I was considering.
>
> Of course if somebody has a little bag of magic dust that instantly 
> repairs
> things....
>
> Bob
>
>
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of paul swed
> Sent: Tuesday, March 09, 2010 8:49 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] 5370A vs 5370B
>
> I don't think thats true.
> There would be a lot of common parts so the question is what are you 
> looking
> for?
>
> On Tue, Mar 9, 2010 at 7:47 AM, Bob Camp <lists at rtty.us> wrote:
>
>> Hi
>>
>> So a parts donor 5370B is a donor for 5370B's and not so much for a 
>> 5370A.
>>
>> Bob
>>
>>
>> On Mar 8, 2010, at 11:37 PM, Bruce Griffiths wrote:
>>
>> > The input amplifiers also differ.
>> > The linear input voltage range of the 5370B input amplifiers is greater
>> than that of the 5370A.
>> >
>> > Bruce
>> >
>> > Chuck Harris wrote:
>> >> Front panel, chassis, motherboard, and power supply appear to be the
>> same.
>> >>
>> >> The CPU, ROM, and RAM boards were made into a single board.  There 
>> >> were
>> >> some changes to the counting circuitry to make it more production
>> friendly.
>> >>
>> >> The whole counter was sped up so that it could read at a somewhat
> higher
>> rate
>> >> than the 5370A.
>> >>
>> >> -Chuck Harris
>> >>
>> >> Bob Camp wrote:
>> >>> Hi
>> >>>
>> >>> How much of the 5370A was directly carried over into the 5370B?
>> >>>
>> >>> Bob
>> >>>
>> >>> _______________________________________________
>> >
>> >
>> >
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