[Amps] SB-220

[Bill Turner]

On Wed, 03 Nov 2004 13:58:51 -0500, Will Matney wrote:

>Now to me, if the lead(s) length is correct, and the gain high enough, 
>the internal capacitance of the tube along with the inductance of the 
>lead(s) could make up a VHF oscillator. 

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One other factor not mentioned is the Q of the VHF circuit, which has
a great effect on gain.  If the VHF Q is very high, oscillations are
almost guaranteed.  VHF Q is usually not known in most amplifier
circuits, and having a parasitic suppressor circuit is just added
insurance.  I wouldn't be without one.

--
Bill W6WRT