[Amps] Parasitic Oscillation

[David Lisney]

Hi, I stumbled across an enlightening article discussing the construction of 
a twin 4-400 amplifier, it seems the prototype had a parasitic problem at 
160Mhz, it seems the fix was found referring to an Eimac engineering 
bulletin of the time. The article appeared in QST, April 1957... completed 
amplifier used a series tuned circuit with damping resistor from the tube 
grids to ground, incidentally it used NO parasitic stopper in the anode.

73 de David