[time-nuts] HP 5370A to B conversion

Magnus Danielson magnus at rubidium.dyndns.org
Fri Dec 19 14:29:09 EST 2014

There is a mod on the A model which was fixed in the B version.

As I recall, it was to reduce cross-talk. Bruce the almighty might 
recall better than me.

I would recommend Perry to apply the BBB based CPU-boards. Good use of 
the hardware at hand.


On 12/19/2014 02:55 PM, Chuck Harris wrote:
> There really is no need to convert it to a B unit, as
> the A unit has the same specifications.  If you put
> John Seamons' BBB CPU card in it, it will simply sing
> as far as speed goes, and you can use the A or B
> virtual roms as you wish.
> The principle difference is the B analog boards are
> easier to calibrate, and, have a different range of
> threshold settings on the front panel knobs..

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