One of my current AM amps uses a pair of WW2 radar 6C21's which is a pulse
rated 450TL that was run with a higher filament voltage in order to get more
emission and a short life.
I run them as a 450TL and the glow is sure nice.
Carl
KM1H
----- Original Message -----
From: "Col. Paul E. Cater" <paulecater@gmail.com>
Cc: "Amps reflector" <amps@contesting.com>
Sent: Thursday, January 30, 2014 11:36 AM
Subject: Re: [Amps] Weird Tubes
As a teen, I found an old ground-to-air transmitter from WWII. It was 8"
tall and ran a pair of 450TL finals. It's guts looked like something in
the background of a Frankenstein movie. It was multipurpose heating and
lighting the room at no extra costs.
Being young and stupid, I put a penny in the screw-in type fuse box to get
it enough current to run.
A wonder I didn't burn the house down.
Paul
WD8OSU
On Thu, Jan 30, 2014 at 11:26 AM, Carl <km1h@jeremy.mv.com> wrote:
One of my dads friends was an old time ham and I was invited to his
house.
Unfortunately I dont remember his call but it was W2B?? and this was
around
1954-55.
On the roof was a HB 3el 20M yagi. In the house was the PP VT-127A amp
along with a SX-28. The transmitter was home brew and ran on 20M CW only.
On the floor in the corner was a big pole pig transformer.
When run at his CW speed the anodes were white. Many years later when I
had a better understanding I had to assume that the 1000W input rule was
being seriously abused (-;
Carl
KM1H
----- Original Message ----- From: "Fuqua, Bill L" <wlfuqu00@uky.edu>
To: "Barrie - Yellowstone Photo" <barrie@yellowstonephoto.com>; <
amps@contesting.com>
Sent: Wednesday, January 29, 2014 10:32 PM
Subject: Re: [Amps] Weird Tubes
I picked up an old HB amplifier that had two VT-127 triodes in it at
Dayton a few years back.
Just could not resist it.
73
Bill
________________________________________
From: Amps [amps-bounces@contesting.com] on behalf of Barrie -
Yellowstone Photo [barrie@yellowstonephoto.com]
Sent: Wednesday, January 29, 2014 6:01 PM
To: amps@contesting.com
Subject: [Amps] Weird Tubes
I recently built a class C amp using a push-pull pair of VT-127As.
These
tubes
are WW2 radar
tubes; sort of a cross between a 100TH and 100TL. The glass is much
different.
Looks like a spaceman.
The partially completed modulator will use a pair of VT-327As; a very
similar
tube, but with twice the
filament power. The setup should put out 500 watts of AM, or CW.
The reason I'm building this rig is that a high school buddy, Scott,
W7TLZ's
father (a ham) built him
a pair of VT-127As for 40M CW. When I saw that rig, with the plates
glowing
bright red each time
hit the key, I almost cried.
Then I went home and looked at my single 6L6 rig.
Well, Scott is now SK, so the rig I'm building is the "W7TLZ Memorial
Transmitter".
73, Barrie, W7ALW (since 1950)
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