On May 30, 2006, at 11:07 PM, Steve Thompson wrote:
>
>
> R L Measures wrote:
>
>> Just how the AL-1500's designer came to the conclusion that 5000-ohms
>> of feedback XC at the tube's max freq rating could not cause
>> oscillation is a mystery.
>
> Maybe he didn't. Feedback C is but one of many factors contributing to
> oscillation, and one over which the designer has no influence. Perhaps
> he believed/designed/intended that other elements of the circuit
> prevented gain>1 and phase=0 without the need for an anode auppressor.
It must have have been a wishful intention, Steve, since there is
nothing unique about the 8877 -- in fact, its extraordinary gain-
bandwidth product should have been a pretty good clue that
oscillation was something it could probably do.
>
> Steve
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
R L MEASURES, AG6K. 805-386-3734
r@somis.org
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|