01/tuckerkw/tucker_transmitter.html
All I can say is that with today's restrictions on peak output
power, the tubes in the rig will just idle along, and last forever..
Patrick
--
From: "Jim candela" <[EMAIL PROTECTED]>
Subject: RE: [AMRadio] 3-500Z vs 4-400A
To: "Discus
It's to drive the screen grids, so since they run at 500VDC or
more in AB1, it could reasonably take 1000V G2 to G2 to fully
bring each tube to peak plate current. I think I read that the
"120W 807's" needed about 400V G2 to G2.
Patrick
--
I just don't see a pair of ANYTHING as needing 1000 g
Hi Pat,
The 20K resistor idea was published in an old article on getting 120 watts
from a pair of 807s, but I have been told it really didn't produce that much
power, it did some really odd things at low audio levels, and it really
didn't sound good.
The idea about tying the control grid and scre
Dennis,
With the mention of 813's it got me thinking that it might be possible to use
the right multitap mod transformer and configure an ultralinear screen tap
hookup thereby eliminating the screen supply and gaining the HIFI attributes
of that configuration. That would also allow me to Variac t
> Patrick,
>
> For a "legal" AM plate modulated ham rig, running the tubes you
> mentioned as you mentioned is way over kill. Heck, ~ 300 watts or so of
> audio is all you will ever need to modulate the a rig designed for 375 watts
> carrier output. If I had 4-400's I'd go AB1 and run it as
Patrick,
For a "legal" AM plate modulated ham rig, running the tubes you
mentioned as you mentioned is way over kill. Heck, ~ 300 watts or so of
audio is all you will ever need to modulate the a rig designed for 375 watts
carrier output. If I had 4-400's I'd go AB1 and run it as a tetrode.
I don't know what the 3-500Z's like to look into for a load but it sounds
perfectly feasible to me.
John, WA5BXO
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Patrick Jankowiak
Sent: Thursday, December 09, 2004 8:39 PM
To: amradio@mailman.qth.net
Subje
Patrick,
Never tried it, but my understanding is one simply needs to tie the screen
and control grids directly together on the 4-400 to make it a zero bias Class B
triode. This is what is done with 813s. Not sure what kind of a peak
grid-to-grid input voltage swing would be needed but 1 KV
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