[Amps] Amp With A Roller Inductor?

[Steven Katz]

I've had various Henry amps with edge-wound roller inductors as the primary PLATE tuning mechanism.

My last one, a Henry 3K Premier, used that.   It used plunger-switch selected (activated by cams on a camshaft that was the bandswitch) fixed capacitors for each band, with the main plate tuning being the roller inductor.

You just tune for Ip dip/maximum output power (which also coincides with the Ig peak -- all the same tuning point) just like with any other tube-type, manually-tuned tank amplifier.

-WB2WIK

-----Original Message-----
From: Amps <amps-bounces at contesting.com> On Behalf Of Joe
Sent: Monday, September 13, 2021 12:36 PM
To: Amps Reflector <amps at contesting.com>
Subject: [Amps] Amp With A Roller Inductor?

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
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