[Amps] Glass tube plate color

Sun Aug 15 18:22:09 PDT 2010


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 at centric.net>
> To:<amps at 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 at jeremy.mv.com>
>> To: "Barrie Smith"<barrie at centric.net>;<amps at 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 at centric.net>
>>> To:<amps at 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 at uky.edu>
>>>> To: "Barrie Smith"<barrie at centric.net>;<amps at 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 at contesting.com [amps-bounces at contesting.com] On
>>>> Behalf
>>>> Of
>>>> Barrie Smith [barrie at centric.net]
>>>> Sent: Sunday, August 15, 2010 12:52 PM
>>>> To: amps at 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 at jeremy.mv.com>
>>>> To: "Barrie Smith"<barrie at centric.net>;<amps at 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 at centric.net>
>>>>> To:<amps at 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 at contesting.com
>>>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>>
>>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Amps mailing list
>>>> Amps at contesting.com
>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Amps mailing list
>>>> Amps at contesting.com
>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>
>>>
>>
>>
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>