[Amps] Grid driven Multi-band amp using 4-1000

[Harold B. Mandel]

Dear Steve,

Neutralization of tetrodes provides a better match between
the driver and Power Amplifier, and also serves to protect
the PA from deleterious oscillations.

With the cost of a replacement tetrode weighed against
the cost of materials, (inductor, capacitors, etc) of a
neutralization circuit it almost seems effective to
incorporate it in the design.

Hal Mandel
W4HBM




> 
> If the control grid were swamped in the 50 to 200 ohm range, and 
> the
> Screen grid was made the shielding element (assume DC ground, and 
> cathode
> and grid float DC), did you still experience instabilities such 
> that
> neutralization was required ?