Hi Jim,
I had the same problem, my usual amp is missing 160m as well.
I decided to use a single 3CX3000A7 in GG for my 160m amp.
The tube is instant on and the cooling requirement is low.
With a relatively low Q in the Pi-L there is no need for auto tune.
Once tuned up at 1850 I don´t have to worry about retuning unless I move
towards 2MHz.
Headroom is plenty of course and no chance to overdrive the grid with a 200W
transceiver.
73
Peter
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Jim Hoge
Subject: [Amps] triode or tetrode
I am kicking around the idea of a new amp ( I want 160m capability which my
current amp doesn't have) and have a few questions for the gurus and those
that
have theses beasts. Am I better off with a triode or tetrode based amp? Does
it
really matter? How about a one or a two holer amp? How much headroom should
I
look for in a legal limit amp? Some designs are nearly at the limit of the
tube(s). How about auto tune capability? Do the amps that have this feature
find
the best match or will an override/manual tune do a better job? Any other
tidbits of wisdom?
Tnx,
Jim W5QM
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