[Boatanchors] Fw: Any articles on 4-400A Grouded-Grid Amplifier ??

[Olaf Madsen]

----- Original Message ----- 
From: "Olaf Madsen" <Olaf at carolina.rr.com>
To: "hallicrafters" <hallicrafters at mailman.qth.net>
Sent: Sunday, February 19, 2006 3:21 PM
Subject: 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---