It's called a cone heater.
http://www.process-heating.com/CDA/Archives/580bd902cd4fd010VgnVCM100000f932a8c0____
73
Jim W7RY
----- Original Message -----
From: "K6QD" <k6qd@cox.net>
To: <amps@contesting.com>
Cc: <ham_amplifiers@yahoogroups.com>
Sent: Wednesday, January 07, 2009 10:25 AM
Subject: [Amps] Balast Resistor used in Henry PA's
>I am looking for one (or two) ballast resistors (heating element), approx.
> 30Ω cold, that are used in various Henry amps., specifically the 4K-U.
> They
> are made from helically wound Nichrome wire on a ceramic form. The
> resistor
> has a screw-in, light bulb type base. Any help would be appreciated.
>
> Tks es 73 de Mike K6QD
>
>
>
>
>
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