Hi Chris,
Did you Try capacitors across the supply lines right at the output
connectors and also from both + and - to earth?
Did you try the same at the mains input with suitable voltage rating?
Regards
Lawrence
On 6/6/17, Chris Wilson <[email protected]> wrote:
> Hello LF'ers,
>
> I have had a few issues with my lovely old Farnell H60/50 linear
> bench power supply. It'll do 60V @ 50A but I suspect it's last couple
> of uncontrolled output voltage failures may have been caused by RF
> getting into it, maybe up the output leads, maybe elsewhere. The
> manual makes mention of using caps of "a suitable value" across the
> output, or each output pin to ground, when used to power "transient
> loads" ; it's far from clear what's meant. The -ve floats relative to
> chassis ground. What do people recommend as a means of stopping RF
> getting in via the + and - output leads please?
>
> It has SCR control on the transformers primary to keep the voltage
> drop across the huge pass transistor tunnel down to around 8V, this
> seems to go haywire at random times when powering my TX, and the
> 2N3055's don't like 103V into them. Worst case scenario should be
> 73V, but I am pretty sure SCR control fails and the secondary rises
> to its full potential. Thanks.
>
> --
> Best regards,
> Chris mailto:[email protected]
>
>
>
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