Re: Plate parasitic suppression chokes

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Wim Bosma" <wbosma-at-stud.tue.nl> 

Hi Brad,
the 1981 ARRL Handbook says in Fig.72: " Parasitic suppressor: 4 turns #16
enam. wound around three 150-ohm, 1-watt resistors connected in parallel."
It is in series with the plate lead. The value is not critical because the
inductance is heavily damped by the resistor.
Overmore, the 833's gain drops off quickly at the higher frequencies.
A plate choke is a different beast that should have a high impedance at the
working frequency as it is parallel to the rf plate load.
Regards, Willem Bosma, PA0TW.

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, May 19, 2004 4:31 PM
Subject: Plate parasitic suppression chokes


 > Original poster: "Brad Huff" <huffb-at-avalon-dot-net>
 >
 > Does anyone know how critical the resistance value is for the plate choke
 > for an 833-A in vttc service? I have several small value wirewound
 > resistors to choose from also the formula for the inductor would be
helpful
 > or is it at all critical?-Brad
 >
 >
 >