[time-nuts] Re: HP 5065A, no 2nd harmonic.

[Larry McDavid]

Try as I might, I cannot hear a single thing from my 5065A, which has 
run 24/7 for five years without issue.

Jared earlier said he has inverter noise from his 5065A and now Magnus 
reports it also. How common is this?

I will be interested in a replacement A15 regulator board as Ulf 
Kylenfall SM6GXV described. Let's allow Ulf to build and test the PWBs 
he receives and then some kind of group buy could be arranged.

I have an operation manual from ArtekMedia for the 5065A but it shows 
the older OCXO and has no service details or schematic. Is a more 
complete manual available anywhere?

Larry


On 12/2/2021 2:49 PM, Magnus Danielson via time-nuts wrote:
> Hi Jared,
> 
> One of my 5065's have exactly this fault.
> 
> One approach is to rebuild with a new power inverter. Another is to 
> rebuild the amplifier board so it does not need -20 V and can operate 
> only on +20 V.
> 
> There should be DC-DC inverters, but I failed to grab a suitable 
> pre-built board for it.
> 
> I would enjoy not having to hear the 3.5 kHz switching frequency in my lab.
> 
> Cheers,
> Magnus
...
-- 
Best wishes,

Larry McDavid W6FUB
Anaheim, California (SE of Los Angeles, near Disneyland)