[Amps] More instability problems

[Eddy Swynar]

On 2013-04-16, at 10:43 AM, N1BUG wrote:

> 
> The present input configuration is a 50 ohm RF load resistor with a .01 cap coupling to the cathode. I am trying (again) to figure out some practical method of adding tuned input to this amp but I am at a loss. Lack of space and switching problems are problematic.



Hi Paul,

Make an OUTBOARD tuning arrangement of pi-tank coils---one per band, switch-selectable, mini-box mounted---similar to what was shown years ago in the ARRL book, "HINTS & KINKS".

~73~ de Eddy VE3CUI - VE3XZ