Hi Pete....yes, all 30L-1 amps had that voo-doo tuning circuit and the
operator and the amp will be well served to avoid its use. It is
frequency sensitive and if it is aligned incorrectly, the operator can
easily burn up the tubes as I did.
Avoid the Collins propaganda and tune this amp in a conventional manner
with a wattmeter and pulser.
Regards
Dave Harmon
NSRCA 586
K6XYZ@comcast.net
Torrance, Ca.
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
On Behalf Of Pete Smith
Sent: Saturday, November 01, 2003 2:09 AM
To: Vic Rosenthal; Dan Levin
Cc: amps@contesting.com
Subject: Re: [Amps] Tuning a 30L-1
At 07:59 AM 10/31/03 -0800, Vic Rosenthal wrote:
>Although I don't have a 30L-1, it's common that you get better IMD
>performance from a gg amplifier when it is loaded slightly more heavily
>than the point of maximum output. So what you see makes sense, and if
you
>are operating SSB it would be a good idea to tune according to the
>instructions. Grid current will increase in the more lightly loaded
>condition, although I don't think this would be a problem for the
811As.
The 30L-1 I used to use at a club station had one of those Collins
zero-centered tuning schemes, if I remember correctly. Perhaps not all
of
them had it?
73, Pete N4ZR
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