Ameritron uses a MOX resistor with capacitors to cancel out the XL. Works
fine.
Carl
KM1H
----- Original Message -----
From: "Martin Sole" <hs0zed@csloxinfo.com>
To: <amps@contesting.com>
Sent: Monday, July 26, 2010 7:47 AM
Subject: [Amps] More parasitic choke questions
> Well only one really.
>
>
>
> The recent Parasitic choke threads on here, as opposed to older threads,
> were interesting and reasonably concise. I appreciate well enough that
> there
> are likely many unknowns that make calculating the ideal PC somewhat
> difficult. That said I am interested in the basic theory and selection of
> components, particularly resistors.
>
>
>
> If we accept that in any given design the components used have been
> 'reasonably' well chosen, and worked well enough when new then there would
> seem little point in going too far to 'improve' it. It does seem though as
> if the preferred carbon composition resistors are no longer easily found.
> I
> appreciate that there are specialist resistors that will do the job,
> Globar
> being one trade name often mentioned, but these are even harder to locate
> than carbon composition 2 watt resistors, at least they are here. What
> other
> choices are reasonable? What do Ameritron fit in their AL80. 82, 572 etc
> amplifiers? Anybody else still selling tube amplifiers, what do they use?
>
>
>
> Having seen a picture of the inside of an AL80 it looks as if a regular 3
> watt or so carbon film resistor is used, appeared to be 100 ohm. Why would
> using carbon film be a bad idea?
>
>
>
> Martin, HS0ZED
>
>
>
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