One reason that an SB-220 can develop VHF parasitics is the following: the
original suppressors use 2-watt carbon composition resistors. These resistors
tend to increase in value when they age, and especially when they are heated.
If an SB-220 has been used heavily, especially on 10 meters or -- worst case --
on 10 (or 11!) meter AM, the resistors will have gotten quite hot and may have
changed significantly in value, or even opened up.
If the resistors are discolored, they should definitely be replaced.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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