Dave….
Remove the loads from the control board and see what the voltage is then. It’s
possible somewhere along the +8 volt line is pulling more current and thus
dropping the voltage. Separate the loads from the card and see what happens
Mike Bryce WB8VGE
prosolar@sssnet.com
"The eye is always caught by the light, but shadows have more to say"
> On Jul 25, 2020, at 9:08 PM, William Redfearn <n4elm@bellsouth.net> wrote:
>
> I'm looking for a 90192 Control board for a TT 509.
> Apparently this is a very early one as it does not match my other 509 or the
> manual.
>
> The problem is the 8 volt power supply section is dropping to 5.3 volts when
> the radio is turned on.
> Voltage & resistance measurements and substitution have proved this out.
>
> Any control board from a 509 or 515 should work.
> Thought I'd see what I can find before I pull the discrete components and put
> in something like a 7809 regulator.
>
> Thanks!
>
> 73 - Dave, N4ELM
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