[Hallicrafters] Any articles on 4-400A Grouded-Grid Amplifier ??

[Dave Harmon]

Olaf.....
You can subscribe to the 'AMPS' forum and get really great advice from
those guys.
http://lists.contesting.com/mailman/listinfo/amps


Regards

Dave Harmon
NSRCA 586
K6XYZ[at]valornet[dot]com
Broken Arrow, Ok.

-----Original Message-----
From: hallicrafters-bounces at mailman.qth.net
[mailto:hallicrafters-bounces at mailman.qth.net] On Behalf Of Olaf Madsen
Sent: Sunday, February 19, 2006 2:22 PM
To: hallicrafters
Subject: [Hallicrafters] Any articles on 4-400A Grouded-Grid Amplifier
??

Hello Fellows,

I aquired a 1960's or 70's homebrew amplifier that uses very,very basic 
grounded-grid circuitry,ala 1972 Handbook.

4-400A tube -- screen and grid directly grounded -- Filaments isolated
with 
B&W FC-30 Filament Choke. --No Input circuit,-- direct feed to 
Cathode --National 175  RF Plate Choke--500pF TV doorknobs to by-pass
and 
couple to Pi-Network with B&W 851 switched Tankcoil (10-80 mtrs)---3000V
on 
the plate--NO PARASITIC SUPRESSION what-so ever.

The amplifier looks very impressive---nice frontpanel,meter and knobs
and 
Hallicrafters cabinet ala SX-42,SX-101 and the like.---The transformer 
''weighs a ton''.--Fits right in with the other Hallicrafters
Boatanchoers.

Can anyone lead me to an article that might have been used to build this
amp 
or cover the subject  (Tetrodes in GG )???---Of course,it wants to
''take 
off'' just turning the Tuning or Output capacitors.

Tnx in advance es 73's---Olaf,---KF4TP---  

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