[time-nuts] HP 105B Modification

[Ed Palmer]

The schematic is available here:  
http://www.murgatroid.com/t_and_m/hp-00105-6100-figs.pdf .  It's also 
available with circuit description & waveforms here:  
http://www.kennethkuhn.com/hpmuseum/scans/hp5065a_part3.pdf on pages 
93-101 (pdf pages - not document pages).  However, this copy doesn't 
show the schematic for the power supply board.  I also see that document 
page 8-54 is missing which might be the problem.

Ed

Bruce Griffiths wrote:
> If you send me the schematic for the circuit in which its used I can 
> answer that question better.
>
> Bruce
>
> Ed Palmer wrote:
>> Perhaps, but given what it's replacing and what it's driving, is the 
>> difference significant?
>>
>> Ed
>>
>> Bruce Griffiths wrote:
>>> Ed Palmer wrote:
>>>> Yes, I have the same configuration.  The part number for the 
>>>> divider board is 05061-6165.  The 10811 + daughter boards are used 
>>>> in the 105B, 5061B Cesium, and the 5065A Rubidium.  The circuit 
>>>> loading problem is exactly the kind of issue I was expecting.  
>>>> Thanks for the warning.  I could probably resolve it by replacing 
>>>> the existing 7474 with a 74HCT74, but I'd like to minimize the 
>>>> amount of hacking I inflict upon the unit.
>>>>
>>>> Ed
>>>>
>>> A 74AHCT74 would be a superior replacement.
>>>
>>> Bruce