Bill Turner wrote:
> ORIGINAL MESSAGE:
>
> At 04:22 PM 1/1/2006, R. Measures wrote:
>
>>** A problem with a resistor that is c. 120mm long is that has more
>>L than would be optimal for a parasitic suppressor.
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> I thought about that, but the L would be there anyway. The 8877 sits
> low on the chassis and the top of the plate choke is six inches above
> the chassis, so the wire would be that long anyway. I guess I could
> have mounted the choke horizontal but it's too late now. :-)
Having the L in the resistor is different from having it in series with
the resistor/inductor suppressor. Whether the difference matters is
unique to your amplifier and its gain/phase characteristics. If you can
measure them, you can design a suppressor that's spot on for the job -
if you can measure them, you might find that you can make an amp that
avoids oscillation without needing a suppressor.
Steve
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