[Amps] Glitch resistors

[Richard]

>I am working on an amp with a pair of grid driven 4-400's. What size
>glitch resistor would be recommended for the plate circuit ?

1, 10 -15 0hms, 10w. vitreous enamel for up to 3kV.  2 in series for more 
than 3kV or >30uF.

> Also what do you do about the screen ?

Bypass each screen pin (2 & 4)with two, different value capacitors say c. 
500pF and 2500pF.  This helps VHF stability. Use 800v regulated on the 
screen.  A zener-string shunt regulator fed through a power resistor 
connected to at least a 1500v source is good.  
Tuning a grid-driven amplifier is different than tuning a grid-driven 
Class AB1 amplifier.  Info is on my Web site.  

>Also what would be good for parasitic suppressers?
>
A low VHF-Q design proivides c. 60% lower VHF gain with the tradeoff of 
c. a 2% power decrease at 29MHz.  Ugly resistance-wire exhibits lower 
VHF-Q than beautiful silver strap.  We sell low VHF-Q suppressor kits as 
well as bulk materials.  Info is on my Web site. 
 
cheers, Gary

-  R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, 
www.vcnet.com/measures.  
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