I need one more 6C21 to build that Roger but Id rather put them on HF.
I did build the 100TH copper tubing version but it was plate modulated AM
only and a huge TVI generator. Shortly after that the converted NCL-2000
replaced it and was even a nice DSB AM linear using a CE 10A and HB 815 TX
converter. SSB was still in the minority on 6 at that time and CW was almost
never heard except for code practice up the band.
Carl
KM1H
>
>
> On 8/15/2010 7:07 PM, Carl wrote:
>> I know I have at least one NIB GE 592 and maybe another. There was a 50's
>> CQ
>> VHF Manual circuit using a pair for a 2M KW amp. Ive been collecting TX
>> tubes for over 50 years and have a rather interesting sampling and have
>> put several to use.
>>
> They also had a 6-meter rig using a pair of those 6C21s running PP with
> vertical copper pipe above each one for the plate lines. Seems like the
> amp was 6' tall, or a bit more. Now a pair of 450 to 750THs might do
> right well like that and reach today's legal limit.
>
> 73
>
> Roger (K8RI)
>
>> Carl
>> KM1H
>>
>>
>> ------ Original Message -----
>> From: "Barrie Smith"<barrie@centric.net>
>> To:<amps@contesting.com>
>> Sent: Sunday, August 15, 2010 4:35 PM
>> Subject: Re: [Amps] Glass tube plate color
>>
>>
>>> 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
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> Amps mailing list
>>>>> Amps@contesting.com
>>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> Amps mailing list
>>>>> Amps@contesting.com
>>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>
>>>>
>>>
>>>
>>> _______________________________________________
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>>> http://lists.contesting.com/mailman/listinfo/amps
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