[Amps] Tuning a 30L-1

[rlm]

***  To tune up a 30L-1 for SSB, apply full drive using high speed dits 
to relieve stress on the PS as well as the delicate 811A plates/anodes. 
  Tune and Load for max relative output.  Plate/anode current with dits 
should be c. 400mA indicated, which is roughly 800mA peak -- which is 
close to the linear-mode emissive limit of 4, 811As. If the indicated 
current with dits is over 400mA, less drive is indicated.

have phun, Dan

On Thursday, October 30, 2003, at 11:14  PM, Dan Levin wrote:

> I have borrowed a Collins 30L-1 amplifier from a friend for CW SS,
> and have a question about tuning it up.
>
> When I tune the amp up according to the instructions, by setting the 
> Load so
> that when I dip the Tune meter of the amp using the Tuning Capacitor 
> the
> Tune meter reads "0" - I get about 300 watts output at the recommended
> 600 ma of plate current key down CW.  Plate voltage is per spec.
>
> If I tune the amp for maximum power output, I tune it with less Load 
> than
> the previous method (the manual's method) would suggest, and I get
> about 700 watts of output at 600 ma of plate current.  Interestingly, 
> when
> I use this method, the Tuning capacitor ends up in the white range on 
> the
> dial - when I use the manual's method it doesn't always.  When I use
> this method, the Tune meter reads less than zero.
>
> There is no grid current meter on this amp - so I have no idea how much
> grid current I am running in either scenario.
>
> Which method is correct? - where correct is defined as:
>
> 1) Maximum power output
> 2) No damage to the amplifier
> 3) A clean transmitted signal
>
> Thanks!
>
>             ***dan, K6IF
>
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Rich Measures, AG6K, 805.386.3734.  www.somis.org/