[Amps] Weird Tubes

[Roger (K8RI)]

On 1/30/2014 11:52 AM, Carl wrote:
> 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.

Glow...I mentioned my 6C21 amp. I drove it with an HT37.  Thing is, I 
forgot to turn the drive down so the first, and only transmission from 
that tube was with a 100 watts drive.

I don't know what I had for power, but vaporizing tungsten is real, 
really bright.  It's a wonder my shadow wasn't burned into the basement 
wall.  OK. maybe a bit of an exaggeration, but I'm glad I wasn't looking 
directly at the anode.  I'm glad I picked up a few good ones for $5 
each.  They seem to have gone up a bit.

73

Roger (K8RI)

>
> Carl
> KM1H
>
>
> ----- Original Message ----- From: "Col. Paul E. Cater"
> <paulecater at gmail.com>
> Cc: "Amps reflector" <amps at 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 at 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 at uky.edu>
>>> To: "Barrie - Yellowstone Photo" <barrie at yellowstonephoto.com>; <
>>> amps at 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 at contesting.com] on behalf of Barrie -
>>>> Yellowstone Photo [barrie at yellowstonephoto.com]
>>>> Sent: Wednesday, January 29, 2014 6:01 PM
>>>> To: amps at 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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>>>>
>>>>
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>>>>
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>
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