[time-nuts] Dead 5065A - Regarding A3 (Series 2644A)

[paul swed]

Ulf on the A3 module I think you are correct. It may be very reasonable to
create a new version of the unit. As I recall its multipliers and a power
amplifier.
Kind of a curious question can a PLL be used and a power amplifier?
Just thinking of a simplified multiplier chain.
Regards
Paul

On Tue, Aug 25, 2020 at 2:53 PM Ulf Kylenfall via time-nuts <
time-nuts at lists.febo.com> wrote:

>
> Ah..
> The two A3-units I have are labelled Series 820 and 836.
> Luckily, there has been no problem adjusting thetrimmer capacitors. The
> inductor I do not dareto touch. I know too well how brittle a stuck ferrite
> core is...
>
> Can someone point to a downloadable manualwith schematics/parts list for
> the 2644A-version?
> I did create a "Replica" of a later version of the A7 AC-amplifierusning
> OP-07's and precision film capacitors whichperformed very well. As long as
> semiconductors are availableI would not hesitate to create a replica of the
> A3 as wellshould it come to that.
>
> One question for Corby Dawson: What type was the OP-Ampused in your
> updated integrator? I have not been able to find itor an equivalent. OK to
> use OPA111AM?
> Best Regards
> Ulf Kylenfall
>
>
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