As long as we're rambling on about old tubes and glowing plates, one tube
I'd really like to play with someday is the 592/3-200A3.
I have several that hipot and filament test good.
That tube just "looks" like it would take and make a lot of heat!
I've never seen any mention of a socket for them.
Many years ago I did see one mounted. As I remember, and it's been a long
time, the filament pins were through a hole in a square metal bar, which had
a slot cut so that a set-screw could compress the hole around the pin.
73, Barrie, W7ALW
----- Original Message -----
From: "Carl" <km1h@jeremy.mv.com>
To: "Barrie Smith" <barrie@centric.net>; <amps@contesting.com>
Sent: Sunday, August 15, 2010 2:10 PM
Subject: Re: [Amps] Glass tube plate color
> You are correct Barrie, the VT-127A was aka the 100TS for "Special" in
> house. Eimac has been mixing up standard parts almost as long as they have
> been in business. The original 150T was a pair of 75T's in one envelope
> which morphed to the 152T and later with four into the famous 304 twins.
>
> These days hams use the YC-156 which is a 3CX15000B7 internals with a
> 3CX5000 anode.
>
> A good friend of my dad was a ham who ran a pair of VT-127A's on 20M CW
> only using a pole pig in the 50's. Just keying on CW the plates were
> almost white so Im rather sure he wasnt strictly adhering to the 1000W
> input rule....typical open rack construction. With some air you could
> probably run them safely at or close to 250T specs.
>
> Carl
> KM1H
>
>
>
> ------ Original Message -----
> From: "Barrie Smith" <barrie@centric.net>
> To: <amps@contesting.com>
> Sent: Sunday, August 15, 2010 2:16 PM
> Subject: Re: [Amps] Glass tube plate color
>
>
>> Bill, some answers below.
>> ----- Original Message -----
>> From: "Fuqua, Bill L" <wlfuqu00@uky.edu>
>> To: "Barrie Smith" <barrie@centric.net>; <amps@contesting.com>
>> Sent: Sunday, August 15, 2010 11:10 AM
>> Subject: RE: [Amps] Glass tube plate color
>>
>>
>> These tubes were never intended to be used as amplifier
>>
>> **Perhaps they were never intended to be used in amplifiers, but they do
>> work well in class C service.
>>
>> This rig is just a lark, something fun to build and use on 10 and 15M AM.
>> I
>> had a buddy, Scott, W7TLZ, in junior high school, who's father, a ham,
>> built
>> him a 40M CW rig with a pair of them. That stuck in my craw for close to
>> 60
>> years. I lucked into several of the tubes free a couple of years ago and
>> have now built the RF deck.
>>
>> but in stripline oscillators, either single tube or push-pull.
>> There were no real efforts to match them. In oscillators you want low mu
>> so
>> that they will draw lots of plate current to
>> get started quickly. I seem to recall the plate dissipation was 200 Watts
>>
>> ** The tube is a cross between the 100TL and the 250TL. The plate is 100
>> watts dissapation, from the 100TL. The grid and filament are from the
>> 250TL.
>>
>> with a very bright glow. These tubes were driven hard is early
>> radar and radar jammers. Often pulsed. Hams used to use them because
>> they
>> were very cheap on the surplus market.
>> EIMAC even made a version with a glass tube attached to it (about 1/2"
>> ID)
>> and no vacuum inside to be used as a ion vacuum guage tube.
>>
>> 73
>> Bill
>> ________________________________________
>> From: amps-bounces@contesting.com [amps-bounces@contesting.com] On Behalf
>> Of
>> Barrie Smith [barrie@centric.net]
>> Sent: Sunday, August 15, 2010 12:52 PM
>> To: amps@contesting.com
>> Subject: Re: [Amps] Glass tube plate color
>>
>> Damit, Carl, that's a good question! I'll try that right away.
>>
>> Barrie
>>
>> ----- Original Message -----
>> From: "Carl" <km1h@jeremy.mv.com>
>> To: "Barrie Smith" <barrie@centric.net>; <amps@contesting.com>
>> Sent: Sunday, August 15, 2010 10:45 AM
>> Subject: Re: [Amps] Glass tube plate color
>>
>>
>>> What happens when you swap positions?
>>>
>>> Carl
>>>
>>>
>>> ----- Original Message -----
>>> From: "Barrie Smith" <barrie@centric.net>
>>> To: <amps@contesting.com>
>>> Sent: Sunday, August 15, 2010 11:55 AM
>>> Subject: [Amps] Glass tube plate color
>>>
>>>
>>>> Speaking of class C, I have just completed a nostalgia rig using a
>>>> push-pull pair of VT-127As (somewhat similar to the 100TL, but looks
>>>> like
>>>> a spaceman with grid and plate pins sticking out the sides).
>>>>
>>>> I've been bench-testing it the last few days with a wimpy power supply.
>>>> Surprisingly, I'm up to 500 wattts out with 1300 volts on the plates.
>>>>
>>>> I have several tubes, and have tried a couple of different pairs. In
>>>> both instances I've noticed that one tube will have a slightly brighter
>>>> plate glow than the other.
>>>>
>>>> I'd like to have the tubes as closely matched as possible.
>>>>
>>>> My question is: Which tube is most likely to be the better, the bright
>>>> one, or the cooler one?
>>>>
>>>> 73,
>>>> Barrie, W7ALW, DN36au,
>>>> QRV 6M, 432 & 1296 EME
>>>> _______________________________________________
>>>> Amps mailing list
>>>> Amps@contesting.com
>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>
>>>
>>>
>>
>>
>>
>> _______________________________________________
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>>
>>
>>
>>
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>
>
>
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