29 Dec
2004
29 Dec
'04
11:40 a.m.
One, carbon composition vs. film resistors. It's
not
unreasonable, it turns out, to be able to hear the difference
between them (in early stages). Voltage rating. Carbon Comps
(CC) handle HV (600 VDC) well, films not so well. Likely near
max V all sorts of microvolt-level wierdness begins in the
film jobs, plus micro-arc-overs, leakage paths, etc.
Seem to me that these are just crummy, underrated film types.
CC's are
noisy, and noise injection is complex, but may have dynamic
characteristics that are simply not spec'd.
Composition resistors also are not stable. They drift over time.
William Donzelli
aw288(a)osfn.org