Thank you all who replied to my suppressor questioning. When the weather
allows me to get to my shack I will review all I have and report later. It
has been few years when I worked on this amp and it is still waiting for me
to finish it.
Few years back, when one still could carry tons on the airplane, I picked up
at the Holice fleamarket (Czech Rep.) couple brand new triode tubes (East
German made), tons of silver plate on them, perhaps 20 lbs each tube, I
forgot the nomenclature, but they supposedly need 250 Amps for the heater. I
will report more details on them later. This might fit the "Weird tubes in
the amp" title. Just wondering what one might use them for. Sorry for lack
of detailed info.
So far they are great as a decoration.
Karel, VA3KO
----- Original Message -----
From: "Roger (K8RI)" <k8ri@rogerhalstead.com>
To: <amps@contesting.com>
Sent: Wednesday, January 29, 2014 2:03 AM
Subject: Re: [Amps] Tube swap
On 1/28/2014 6:11 PM, Carl wrote:The handbook has a good section on
designing them, but after you get all the info, and calculations, you have
to take into account stray inductance and capacitance. IE, they give you
a base design that likely will need to be modified to fit the layout of
the amp and tube, or tube. So as Cars says, pick an amp with the same tube
and similar lauot and build a supressor like theirs and it'll likely work
with little or no modification.
73
Roger (K8RI)
Suppressors are usually tube and layout/construction dependent for the
inductor part.
Look at commercial and good HB ham amps that have the tube you want to
use and go from there.
Having a quality brand of GDO helps a lot as an economical tool..
Carl
KM1H
----- Original Message ----- From: "Karel" <kebenstr@bmts.com>
To: "Carl" <km1h@jeremy.mv.com>; <donroden@hiwaay.net>;
<amps@contesting.com>
Sent: Tuesday, January 28, 2014 5:53 PM
Subject: Re: [Amps] Tube swap
Thanks Carl,
I just have to figure out what the factory design should be. I will
definitely use ceramic resistor. Any suggested lead to better
suppressor setup?
Values, arrangement? Thanks,
Karel, VA3KO
----- Original Message ----- From: "Carl" <km1h@jeremy.mv.com>
To: "Karel" <kebenstr@bmts.com>; <donroden@hiwaay.net>;
<amps@contesting.com>
Sent: Tuesday, January 28, 2014 4:26 PM
Subject: Re: [Amps] Tube swap
Stick to factory designs, they work fine for decades without problems.
The Ohmite OY series of ceramic resistors do well in place of out of
tolerance carbon composition.
Sell the voodoo crap on fleabay to a CBer
Carl
KM1H
----- Original Message ----- From: "Karel" <kebenstr@bmts.com>
To: <donroden@hiwaay.net>; <amps@contesting.com>
Sent: Tuesday, January 28, 2014 2:36 PM
Subject: Re: [Amps] Tube swap
Sorry, I met him over internet right after his write-up for AR
Handbook was rejected and that was a long time ago. I brought up his
name here once before and got slapped for it, sorry, I should know
by now. I owe cup of coffee to all. Hopefully we will meet some day.
I still have his suppressor package for two 4-1000A 's to be
installed. Without bringing his name out again, can someone warn me
about using it?
I installed his suppressor package on my friend's Henry 2K. It
lasted few years, but his plate transformer croaked recently, I
wonder if the suppressor had anything to do with that.
Karel Ebenstreit, VA3KO
----- Original Message ----- From: <donroden@hiwaay.net>
To: <amps@contesting.com>
Sent: Tuesday, January 28, 2014 10:56 AM
Subject: Re: [Amps] Tube swap
Quoting Karel <kebenstr@bmts.com>:
Hardy,
yes I made myself a Hi-pot tester as well. I forgot the specs, but
I believe I can go up to 20 kV. (It may be one of Richard Measures
designs).
Unwritten Amps Rule # 1
Never invoke the name of the witchdoctor.
You owe everyone a cup of coffee.
Don W4DNR
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