[R-390] sp-600-jx-17

[Scott, Barry (Clyde B)]

I don't have an SP600 so I don't know, but I assume you're talking about changing the input tap effectively reducing the output voltages of the transformer.  If this is the case, why does this help with drift?  Is the OA2 unable to regulate properly if the voltage it sees is too high?

Also, is that SP600 drifting towards North Alabama by any chance?  >;-)

Barry - N4BUQ

Llgpt@aol.com wrote:

> Try replacing the OA2 voltage regulator tube, a weak one will cause drift.
> Also, look at the bottom of the power supply transformer, if your voltage is
> over 117 volts, I would suggest moving it to the 139 volt tap.

This is some of the best advice I ever got on here, mainly because it was so
*easy* and it made such an improvement.

Les, I still can't thank you enough for the tidbit about checking the transformer
taps - what a difference it made for me.

73, Boomer  KA1KAQ