[Amps] Plate tank efficiency ?

[Carl]

The 17M LC ratios are poor in the CW position and even worse in the SSB 
position. Moving the 15M tap a bit will give a closer compromise.

The stock plate choke requires 3-4 turns removed for 12M.

Carl
KM1H


----- Original Message ----- 
From: "Cecil Acuff" <chacuff at cableone.net>
To: <amps at contesting.com>
Sent: Sunday, February 14, 2010 10:37 PM
Subject: [Amps] Plate tank efficiency ?


> What causes output tank efficiency to change when voltage/current changes?
>
> My Clipperton L, which has been reworked somewhat, takes a nose dive in
> efficiency when tuned in the SSB position as opposed to the CW.
>
> CW= Slightly over 1500V loaded to 750ma with 800W output for around 70%.
>
> SSB= 2250V loaded to 975ma with 1050W output for a poor 48%.
>
> This testing was done on the 17m band into a Bird load.
>
> Where am I loosing 400 or so watts?  Is this just a limitation in RF 
> current
> capacity of the Tank coils or is there something else at play that I just
> don't understand at this point.
>
> Additional info:
>
> Power supply caps have been replaced.
> Tank coils have been rewound to improve 160M operation from #6 copper and
> #12 (close spaced in teflon tubing) for the 160/80 section all silver
> plated.  Flat copper strip from the bandswitch to the coils all silver
> plated as well.
> LDG auto tuned input board mounted internally.
> Raytheon tubes.
> Amp running on 220vac
>
> Not trying to make a legal limit amp out of it but trying to better
> understand the workings of the output tank...
>
> Thanks in advance..for helping me to understand what is probably elementry
> to most.
>
> Cecil Acuff
> K5DL
>
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