WQ9E
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« on: March 10, 2012, 10:21:43 PM » |
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A truly manly final from Heintz and Kaufman, the Gammatron 254.
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Rodger WQ9E
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kb3rdt
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poop cup
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« Reply #1 on: March 11, 2012, 03:05:41 AM » |
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That would be nice!
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W4AAB
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« Reply #2 on: March 11, 2012, 10:12:05 AM » |
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Now you know where the term California kilowatt came from!!
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Ed/KB1HYS
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« Reply #3 on: March 11, 2012, 11:08:56 AM » |
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Now THATS a final to be proud of. I bet just lighting the filaments would make my lights dim!
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73 de Ed/KB1HYS Happiness is Hot Tubes, Cold 807's, and warm room filling AM Sound. "I've spent three quarters of my life trying to figure out how to do a $50 job for $.50, the rest I spent trying to come up with the $0.50" - D. Gingery
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KA0HCP
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« Reply #4 on: March 11, 2012, 12:13:45 PM » |
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No need for room lights!
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New callsign KA0HCP, ex-KB4QAA. Relocated to Kansas in April 2019.
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KM1H
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« Reply #5 on: March 11, 2012, 01:35:56 PM » |
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That is one big honking piece of glass! They either had a typo or renamed it as the HK 254 is a 100T clone. The biggest Ive seen from HK is the 1254 which is a 750T competitor.
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Opcom
Patrick J. / KD5OEI
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« Reply #6 on: March 11, 2012, 04:12:10 PM » |
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That's impressive. Will it go to 30MHz?
No 'tube envy'.
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Radio Candelstein - Flagship Station of the NRK Radio Network.
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W7TFO
WTF-OVER in 7 land Dennis
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IN A TRIODE NO ONE CAN HEAR YOUR SCREEN
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« Reply #7 on: March 12, 2012, 12:00:11 AM » |
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Carl is right, that has to be a typo. I have seen real HK254's, and that is not one.
A 1254, yes indeed.
The story is Press Wireless used them, others as well but not to any real extent.
73DG
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Just pacing the Farady cage...
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W4AAB
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« Reply #8 on: March 12, 2012, 05:21:02 AM » |
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I remember the story in Electric Radio when Jack McCulloch W6CHE died. He and Bill Eitel, W6UF used to work for H-K and went into business for themselves as Eimac in 1934, since H-K did not consider the amateur radio operators as a viable market. There must have been a change of heart, as there were ads in RADIO all during the late 30's with H-K ads. I traded away all the H-K 254's I had to another list member who has an amp that uses them.Not sure why they used the number 254 on that big tube.
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WQ9E
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« Reply #9 on: March 12, 2012, 07:45:51 AM » |
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While on the topic of H-K, has anyone used one of the "gridless gammatron" tubes? Sort of a catchy name for a high power final
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Rodger WQ9E
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KM1H
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« Reply #10 on: March 14, 2012, 06:12:46 PM » |
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That would be dissipation equivalent to a 1500T from Eimac but I dont know the H-K designation, my stuff goes only to the 1254 whch is half the Pd of the one in the photo
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WQ9E
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« Reply #11 on: March 14, 2012, 07:15:39 PM » |
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Found it in the 1938 Radio Handbook.
It is a HK-3054 HK calls it a general purpose triode for commercial application and states it is the largest air cooled tube made.
Plate dissipation is specified at 1.5 kw but is increased to 3.0 Kw with forced air cooling.
Other specs:
Filament 16 volts at 50 amps Amplification factor 20 Grid to plate capacitance 15 uuf Grid to filament 25 uuf Maximum plate voltage 5,000 Maximum plate current 2 amps Maximum grid current .5 amps
maximum operating frequency isn't specified in the listing
On edit, HK listing sheet advertisement shows the filament rating as 14 volts 45 amps with a maximum frequency rating of 40 Mhz. Grid and plate are both made from tantalum. 1936 price: $467.50
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Rodger WQ9E
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John K5PRO
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« Reply #12 on: March 22, 2012, 02:53:09 AM » |
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Is it big enough? Here I am with a new tube, a tetrode. It costs about what a moderate home costs, and must be lifted by crane. So far I have gotten 250 kw of average power and 3 MW of peak power from it. Later this summer, I hope to get about 350 kW of average power, when the heat exchanger for the dummy load is replaced.
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W7TFO
WTF-OVER in 7 land Dennis
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IN A TRIODE NO ONE CAN HEAR YOUR SCREEN
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« Reply #13 on: March 22, 2012, 03:37:38 AM » |
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Big yes, but tubes that aren't glass don't count...new rules!
73DG
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Just pacing the Farady cage...
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WA3VJB
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« Reply #14 on: March 22, 2012, 06:05:15 AM » |
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Here I am with a new tube, a tetrode.
Sorry John. No glow, no go.
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The Slab Bacon
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« Reply #15 on: March 22, 2012, 08:05:18 AM » |
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Now that Sir is a man's final tube! ! ! ! ! ! ! ! ! Who sez "size doesn't matter"
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"No is not an answer and failure is not an option!"
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KB2WIG
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« Reply #16 on: March 22, 2012, 11:25:31 AM » |
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" 250 kw of average power "
But are they Bird watts?
klc
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What? Me worry?
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k4kyv
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Don
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« Reply #17 on: March 22, 2012, 11:41:57 AM » |
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HK listing sheet advertisement shows the filament rating as 14 volts 45 amps with a maximum frequency rating of 40 Mhz. Grid and plate are both made from tantalum. 1936 price: $467.50 According to the CPI inflation calculator, that would be equivalent to $7,657.01 in 2012 dollarettes. That tube cost the better part of the price of a car. A quad (a pair in the modulator and another pair in the final) would have cost a little over an average year's wages. One tube would have paid about 7 month's house rent. How Much things cost in 1936Average Cost of new house $3,925.00 Average wages per year $1,713.00 Cost of a gallon of Gas 10 cents Average Cost for house rent $24.00 per month A loaf of Bread 8 cents A LB of Hamburger Meat 12 cents Studebaker Car $665.00 Ladies Swimming Costume $6.95 http://www.thepeoplehistory.com/1936.html
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Don, K4KYV AMI#5 Licensed since 1959 and not happy to be back on AM... Never got off AM in the first place.- - - This message was typed using the DVORAK keyboard layout. http://www.mwbrooks.com/dvorak
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KE6DF
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« Reply #18 on: March 22, 2012, 12:10:06 PM » |
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How Much things cost in 1936[/b]
Ladies Swimming Costume $6.95
An even higher inflation rate here as current Ladies swim suits are much smaller. But that's a good thing
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The Slab Bacon
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« Reply #19 on: March 22, 2012, 12:31:39 PM » |
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An even higher inflation rate here as current Ladies swim suits are much smaller. But that's a good thing
Ah, yes, sometimes you can really appreciate the American Way- - Pay more for less....................
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"No is not an answer and failure is not an option!"
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W1IA
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« Reply #20 on: March 22, 2012, 12:44:00 PM » |
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Is it big enough? Here I am with a new tube, a tetrode. It costs about what a moderate home costs, and must be lifted by crane. So far I have gotten 250 kw of average power and 3 MW of peak power from it. Later this summer, I hope to get about 350 kW of average power, when the heat exchanger for the dummy load is replaced.
I have plans for a pair mobile I figure the flat bed will have to accommodate two turbo charged CAT generators at 250kw per. Now the antenna has been a bit of an engineering problem. Due to bridge height restrictions I will pull a second low-boy trailer to maximize the height for the silver plated copper 1 foot diameter vertical; the corona ball will be 4 feet in diameter gold plated wrecking ball. The cab will of course have to be a Faraday cage. I need to work out the watts per cubic centimeter radiation emissions. Bumper sticker included "Lifes to short for QRP" Please forward tank circuit designs for 27 mHz to BillyBob@trailertrash.com
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Run What Ya Brung!
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W1ATR
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« Reply #21 on: March 22, 2012, 09:46:03 PM » |
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Hey John. Thats exactly the Diacrode I need for the particle accelerator I'm building in my garage. They wouldn't happen to have one laying around somewhere that can be slipped into the dumpster, do they???
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John K5PRO
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« Reply #22 on: March 23, 2012, 05:34:02 PM » |
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There are only 3 Diacrodes of that size that have been sold, and I have two of them for the project at work. 7 more will be coming from factory. Not exactly something that will find its way into the dumpster during my watch, Jared. We can wish!
And while I cannot see the plate glow (Xrays and RF levels would be severe) I can see the filament glow quite nicely through 60 small air holes around the lower ceramic. That big filament is at 1950 K, with 20 kW of heat. It makes the ceramic look bright pink. Someday I need to photograph it.
OK, so it glows, and it's a big one. When one appears on 11 meters, that'll be the day.
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Patrick J. / KD5OEI
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« Reply #23 on: March 23, 2012, 09:57:35 PM » |
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How Much things cost in 1936[/b]
Ladies Swimming Costume $6.95
An even higher inflation rate here as current Ladies swim suits are much smaller. But that's a good thing Lady friends have complained that womens' clothing is artificially expensive. I tend to agree, for example her jeans are smaller but cost more. For sure they do not like that but they buy the costly clothing in any case because they look so good in it.
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Radio Candelstein - Flagship Station of the NRK Radio Network.
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W7TFO
WTF-OVER in 7 land Dennis
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IN A TRIODE NO ONE CAN HEAR YOUR SCREEN
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« Reply #24 on: March 24, 2012, 02:18:58 AM » |
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If it ain't mostly glass, with a filament you can see, it just doesn't count. The 851 in your avatar counts. Bigtime. That 'diacrode' gets eaten by the 6949 anyway. Methinks http://frank.pocnet.net/sheets/049/6/6949.pdfStill no glass glow 73DG
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Just pacing the Farady cage...
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