...snip...
>My question is: Is the static/idle noise a common occurance/problem
>for tubes not completely cut off. ......
- Tubes with good vacuums do not appear to have this problem. I
typically use a 100k ohm, 0.5w resistor to develop cutoff bias. The
typical V drop is about 22v during receive. This means that the pair of
3-500Zs are drawing 0.23mA total. I can not hear noise from the 3-500Zs
in the receiver.
>
>Last question: Does/Is there a source of exact size replacement parts for
>the SB-220? ...
HEATHKIT SOLD ALL THEIR PARTS TO AN OUTFIT IN GRAND RAPIDS, MI.
SPECTRUM ELECTRONICS (616) 742-0613
Rich---
R. L. Measures, 805-386-3734, AG6K
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