[Amps] Amp With A Roller Inductor?

[Joe Subich, W4TV]

 > How does one tune an amp that uses instead of a tapped inductor, but
 > uses a roller one?

Depends on whether the amplifier has a band switch which selects fixed
"Tune" capacitors for each band or a continuously variable "Tune" cap.

In the former case, one uses the inductor the same way one would use
a tune cap - dip the plate, peak with the Load cap.

In the latter case, one typically sets the inductor to a specific
value for each band (check the manual) then tune/load as with an
amplifier having a tapped inductor.

73,

    ... Joe, W4TV


On 2021-09-13 3:36 PM, Joe wrote:
> Here's a Question,
> 
> Been hitting a dead end. I have had various AMPs all my Ham life, from 
> 1975. But all have been like the SB-220,
> 
> SB-220,
> SB-200
> FL-2100,
> Henry 2K
> 
> etc.
> 
> Plate cap, load cap, tapped inductor.
> and old school tube rigs Drakes mostly.
> 
> So very familiar with tuning it up.
> 
> Now I have been You Tubing, with zero results.
> 
> And just plain old Googleing,,,, and all I get are results about antenna 
> tuners.
> 
> how to tune an amplifier with a roller inductor?
> 
> I can not find an answer to that question anywhere.
> 
> How does one tune an amp that uses instead of a tapped inductor, but 
> uses a roller one?
> 
> Joe WB9SBD