[Boatanchors] Gonset,GSB-201 (3340) Amplifier

[Mark Foltarz]

Olaf,

   I wonder if your plate choke may have some issues. 

Perhaps it has sorted out a section or it may not be the original.
Just  a thought

de KA4JVY

Mark




>________________________________
>From: Olaf Madsen <olaf at carolina.rr.com>
>To: boatanchors at mailman.qth.net
>Sent: Sunday, November 13, 2011 11:10 AM
>Subject: [Boatanchors] Gonset,GSB-201 (3340) Amplifier
>
>Hello Friends,
>
>I am res-errecting this old 1960 Boatanchor ( Gonset GSB-201)---this is the 
>oldest version (3340) built Gonset using 4(four) 811-A's not the later 
>versions using 572-B's that were manufactured by Aerotron after they aquired 
>Gonset.
>
>The amp uses ''grounded grid'' without any ''tuned input''circuitry --The RF 
>is fed straight into the filaments from the exiter.
>
>I have made the various mods for the antenna switching to be used with 
>to-days transceivers and everything is working fine---Getting full output 
>700-900 Watts on 40.20,15  and even on10 mtrs the amp puts out 700 Watts
>
>On 80 mtrs,however,I only get 450 to 500 Watts out,even though I have the 
>same 100 Watts  drive available from the Tranceiver.---There are 3 positions 
>to add fixed capactors to the Loading  cap,but I cannot sqeeze any more than 
>500 Watts out of it.---the plate current is also pretty high and the tubes 
>are getting red in a hurry.(theTuning capacitor produces a normal dip.)
>
>Looking thru all the info on the internet,I have not come up with anything.
>
>Can someone help me along to understand what causes the problem.---TNX in 
>advance.es 73 de Olaf,KF4TP---.
>
>
>
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