[time-nuts] 5370A vs 5370B

[Don Latham]

shucks, you can always get out the good ol' dremel and score some grooves in 
the broken pots-then use a screwdriver...
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 11:10 AM
Subject: Re: [time-nuts] 5370A vs 5370B


> Hi
>
> I'm about 90% sure I'm going to hang on to the counter. It may wind up 
> with
> a bunch of fixed level inputs on it, but for the price - I'll live with
> that. Other than the blow to the front panel it seems to be in ok shape.
>
> If I do keep it, tearing it open and checking all the internals is
> definitely on the list of things to do. Finding a board loose or a screw
> that needs tightening is pretty likely.
>
> Bob
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Don Latham
> Sent: Tuesday, March 09, 2010 1:04 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] 5370A vs 5370B
>
> 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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