[Amps] R. MEASURES PRAYERS ANSWERED

[Vic K2VCO]

k7fm wrote:

> I have built amplifiers with and without parasitic suppressors and have had 
> parasitics in both - but then again, I am only an amateur.

There's a technique described in my old ARRL Handbooks (1960's vintage) 
to test an amplifier for self-oscillation -- at LF, HF, and VHF. It 
describes the testing procedure, and discusses creating a suppressor (in 
the case of VHF parasitics) that will prevent oscillation with the 
smallest amount of loss.  Rather than simply copying suppressors used in 
other amplifiers with physically different layouts, it seems to me that 
this procedure is a reasonable thing to do when building an amplifier. 
It might turn out that no VHF suppressor is needed -- or not.
-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco