[time-nuts] 5061A Problem Child

Robert Benward rbenward at verizon.net
Mon Jun 14 09:49:07 EDT 2010


Re-seat all of the boards several times.  Just to eliminate oxidation as a 
possible cause.

Bob


----- Original Message ----- 
From: "J. L. Trantham" <jltran at att.net>
To: "'Discussion of precise time and frequency measurement'" 
<time-nuts at febo.com>
Sent: Sunday, June 13, 2010 11:31 PM
Subject: Re: [time-nuts] 5061A Problem Child


> Corby,
>
> It has been a long and frustrating day.
>
> I swapped the A3, A8, A7, A14, and A1 assemblies with a functioning unit 
> and
> the assemblies from the 'problem child' worked in the 'good' unit and the
> assemblies from the 'good' unit failed to work in the 'problem child'.  I
> 'un-swapped the units and now my 'good' unit is having a problem starting 
> up
> the CS Oven.  I hope I have not created another problem.  I decided to let
> it run over night with CS Off and try again in the AM.
>
> The 'problem child' is behaving just like it is not being modulated.  I 
> can
> not explain this unless there is some failure mode in the CS tube that 
> would
> allow Beam I to look ok but no 2nd Harmonic.  With Mod Off, there is a 
> nice
> single peak on Beam I as you adjust the Coarse Osc Frequency.  The 
> electron
> multiplier voltage on the tube is -1515 and I adjusted it to that voltage.
> Should it be more negative?
>
> The only thing measurable that is different from one unit to the other is
> the absence of a signal on the A7J2 test point.
>
> The only other thing I can think of to do is to swap the tube with the A4
> assembly attached along with the A15 assembly from one unit to the other 
> and
> see what happens.
>
> Any thoughts?
>
> Thanks in advance.
>
> Joe
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Corby Dawson
> Sent: Saturday, June 12, 2010 7:23 PM
> To: time-nuts at febo.com
> Subject: [time-nuts] 5061A Problem Child
>
>
> Joe,
>
> Try swapping the A8 module and see what happens.
>
> Corby ____________________________________________________________
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