Larry Carman wrote:
> I was told by a pro amp builder to leave out the silver and use copper only
> in the tank circuit. Reason: because it helps prevent parasitic on the
> higher frequencies. I'm speaking of HF amps working to 30 MHz. Any Merits to
> this???
Not to mince words, it sounds nonsense to me. If that's the
difference between a amp that's stable and unstable, them
there's something much more fundamental needs fixing.
I recall an article in RF Design (but not in fine detail)
where the writer argued that oxidised copper wasn't as much
of a problem as people sometimes think, as the current will
tend to head for lower resistance paths, driving it deeper
into the wire/tube/stripline.
Will mentioned tin plating - I've seen harmonic filters
(VHF, 200Wish) burn up pcbs and unsolder chip capacitors
from the heat when enamelled wire was replaced with tinned
to save on preparation time. Where the loaded Q is low, it
will probably matter less.
Steve
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