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

[Gary Schafer]

Hi Olaf,

First I would suspect your wattmeter. 700-900 watts out of 4 811a's is a lot
of power. They would turn red in seconds at that output if you could even
get that much out. 500-600 watts out would be normal.

What kind of transceiver are you using to drive it with? Does it have an
antenna tuner built in? if not you will not be able to get full drive into
the untuned 811a's.

How much of a plate current dip are you seeing on 80 compared to the other
bands.
Is your loading capacitor at maximum capacitance or at minimum capacitance?

73
Gary  K4FMX

> -----Original Message-----
> From: boatanchors-bounces at mailman.qth.net [mailto:boatanchors-
> bounces at mailman.qth.net] On Behalf Of Olaf Madsen
> Sent: Sunday, November 13, 2011 11:11 AM
> To: boatanchors at mailman.qth.net
> 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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