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

[Llgpt@aol.com]

In a message dated 01/08/02 10:36:40 AM, cbscott@ingr.com writes:

<< 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
 >>

Hi Barry,

The SP-600 has multiple voltage taps, depending on the voltage in your area. 
Most are connected to the 117 volt tap. That was fine when they were built, 
but most of us these days have 125 + VAC. The taps are, 
95,105,117,130,210,234 and 260. Everyting seems to satbilize with the 130 
volt tap connected. Plus the OA2's are notorious for being flaky even when 
they test good in a good tube tester.

Les