Sure have. Have had many Henry amps, they all use roller inductors
(3K-4K-etc). Advantage is being able to optimize "Q" at almost any
frequency, including between amateur bands. Disadvantages include
frustrating initial tune-up process (since the network will provide dips at
many settings, only one of which is best, but several of which might provide
a whole lot of output power) and of course roller inductor failure, which
inevitably occurs when the roller contact falls off the inductor ribbon, or
gets wedged between ribbon turns...and seems to happen with use, shock,
vibration and time.
WB2WIK/6
> -----Original Message-----
> From: carl seyersdahl [SMTP:carlseye@tampabay.rr.com]
> Sent: Tuesday, January 01, 2002 7:47 AM
> To: amps
> Subject: [AMPS] roller inductors
>
>
> does anyone here have experience with amps that use a roller inductor in
> the plate ckt. .. I'd like to know just how good or effective that type of
> ckt. is compared to the "old reliable" pi-network ckt.I'm curious about
> the
> good versus the bad qualities of each.!! Anyone care to comment???
> thanks
> carl / kz5ca
>
>
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