In a message dated 5/10/01 1:34:04 AM Eastern Daylight Time,=20
na9d@speakeasy.net writes:
>=20
> on 5/9/01 9:36 PM, measures at 2@vc.net wrote:
> =20
> >> Might be a good idea, this doesn't usually change stability much
> >> because the feedback mostly involves the grid and layout more
> >> than anything else. But it sure affects efficiency and even IMD!
> >>=20
> > =E2=82=AC In our parasitic suppressor retrofit kit for the 3-1000Z, we=
provide
> > VHF dampers to connect from the filament pins on the socket to gnd.
> =20
> These R-C networks on the filaments do help. They stopped an oscillation
> for my amplifier. One person suggested though that they may have helped=20=
to
> stop an LF or HF oscillation rather than a VHF one. I have no idea and=20
I've
> not thought it out as adding these took care of the problem (similar to=20
that
> of the original poster's but not as severe.).
> =20
> However, we still don't know enough about the original problem just to=20
start
> throwing in a lot of cures w/o understanding the mechanisms behind it. =20
It's
> like going to the doctor with a stomach ache and him giving you pain
> relievers, anti-ulcer medication, etc., when all you needed was a good
> antacid. Sure you might get better, but you don't know why and side=20
affects
> from the treatment may eventually cause other problems.
> =20
> 73,
> =20
> Jon
> NA9D
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D
I can see that there is a great deal of real engineering going on here and=20
lots of technical discussion. Jon says "I have no idea and I've not thought=
=20
it out as adding these took care of the problem". I often wonder how people=
=20
get through life without reasoning. =20
> However, we still don't know enough about the original problem just to=20
start
> throwing in a lot of cures w/o understanding the mechanisms behind it.
Now this is an insightful comment which I'm going to be sure to save in MY=20
Amps folder. It had never occurred to me before that if one doesn't really=20
understand the problem that some difficulty might be encontered in solving=20
same. Perhaps, if we are fortunate, we could have Jon elaborate further on=20
the ramifications of attempting to do something when one knows nothing about=
=20
the subject with which he is dealing.
I look forward to reading more insightful comments about technical matters=20
from Jon....especially the way he explains things in such minute detail=20
without waving his hands in generalities. I'm amazed.
One question for Jon: Please explain "side affects".
73 de
Dave, WT8R
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