[time-nuts] HP 106B quartz frequency standard...the story so far

[WB6BNQ]

And one more request, please measure and tell me what the values are for
the base of the pass element and any driver transistor connections.

Also, it may be that the power supply is really a current source for
charging the batteries.  The power supply and the instrument may need
the batteries to work correctly.  Hp was famous for this type of circuit
topology.

Bill....WB6BNQ

Hi Jim,

YES, please email me the schematics.

thank you

Bill....WB6BNQ
wb6bnq at cox.net

Jim Palfreyman wrote:

> OK folks, I've rechecked the voltages and here's the details.
>
> Firstly, changing the oven temperature screw was a mistake. Read a
> previous thread to see why I did it. It was logical given my
> experience with 10811 ovens. I've owned up to it and begged
> forgiveness from the great Flying Spaghetti Monster. It never answered
> so it must have made me do it. Please drop that now. :-)
>
> When I first powered the unit up it had bad and leaking NiCd batteries
> and made a horrible sound. I removed those and I presume something was
> damaged.
>
> The "input" voltage to the 2N1701 is normal (according to the front
> panel meter) and is close to 26V. The "output" voltage is 25V and not
> 18V as the manual says. I have the manual now and anyone (with more
> experience than me on old fashioned power supplies) who wants to
> comment I am happy to email the circuit diagram and eagerly await
> comment!!!
>
> Jim
>
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