WQ9E
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« on: August 11, 2010, 10:48:01 AM » |
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New tubes for January 1937.
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Rodger WQ9E
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K3ZS
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« Reply #1 on: August 11, 2010, 12:46:08 PM » |
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Are those acorn tubes good for anything these days? Ultrahigh frequency in 1937 was 100 MHz. I have a few of them.
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WQ9E
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« Reply #2 on: August 11, 2010, 01:00:34 PM » |
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Some grid dip oscillators use them (like my Measurements model 59) as do the Hallicrafters S-27/36 series of receivers.
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KB5MD
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« Reply #3 on: August 11, 2010, 04:45:42 PM » |
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 "GAMMATRON", sounds like some type of carnival ride or death ray...
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KM1H
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« Reply #4 on: August 12, 2010, 10:47:37 AM » |
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Yep, the 955 is in my Measurements 59 as well as a HB one I built in 55 from a 49 CQ article. Both work fine today but the 59 gets regular use thanks to the remote head and compact coils.
Still looking for the LF-VLF coils for the 59LF, I have the head.
Carl
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WQ9E
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« Reply #5 on: August 12, 2010, 10:56:26 AM » |
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Yep, the 955 is in my Measurements 59 as well as a HB one I built in 55 from a 49 CQ article. Both work fine today but the 59 gets regular use thanks to the remote head and compact coils.
Still looking for the LF-VLF coils for the 59LF, I have the head.
Carl
I am still looking for both. Probably the sort of thing that is hidden in boxes under tables and is present but rarely seen. |
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w1vtp
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« Reply #6 on: August 12, 2010, 05:09:50 PM » |
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Yeah -- 1937 was a good year -- that's when I was born. Lotta good things happened that year  Did'ja notice the specs for the 807? That old girl has come a long way what with the ratings @ 750 volts now. There were some nice articles in the 50's on using the 807 as a linear amp. 'Magine how a quad of those beauties would do as a linear? I have QST's down to that decade and 1936 on had a new tube section each issue. Exciting times for tube development those years Al |
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Opcom
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« Reply #7 on: August 12, 2010, 09:51:35 PM » |
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some old WWII gear uses them too, like the radar altimeter, etc.
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Radio Candelstein - Flagship Station of the NRK Radio Network.
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W2PFY
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« Reply #8 on: August 13, 2010, 07:41:48 AM » |
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Magine how a quad of those beauties would do as a linear Here ya go Al. This is one I missed on ebay. It was probably a CB amp but I thought it was one of the better looking ones with some good engineering. 12 ea 807/1625 in push pull parallel. |
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The secrecy of my job prevents me from knowing what I am doing.
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W2VW
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« Reply #9 on: August 13, 2010, 07:59:48 AM » |
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Holy parasitic oscillations Batman. Magine how a quad of those beauties would do as a linear Here ya go Al. This is one I missed on ebay. It was probably a CB amp but I thought it was one of the better looking ones with some good engineering. 12 ea 807/1625 in push pull parallel. |
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KB2WIG
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« Reply #10 on: August 13, 2010, 12:44:25 PM » |
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very nice work...... perfect fer the 11m band; I especially like the easy acces to the plate caps and the open construction. I'm sure this will help out the gene pool.
klc
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What? Me worry?
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W2PFY
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« Reply #11 on: August 13, 2010, 12:51:00 PM » |
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and the open construction. It had a cover, I just didn't post it. |
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W9GT
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« Reply #12 on: August 13, 2010, 02:06:23 PM » |
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Magine how a quad of those beauties would do as a linear Here ya go Al. This is one I missed on ebay. It was probably a CB amp but I thought it was one of the better looking ones with some good engineering. 12 ea 807/1625 in push pull parallel. Might even be quite an engineering feat to make that work on 11M! Output C of 12 tubes gotta be high enough to not allow any plate tuning cap at all. Push - pull circuit...looks like pretty small tank coil. 807/1625s were never real popular for linears...except the 1625s that were modified by sawing into the base so the 3rd grid (beam plates?) could be brought out and separately grounded. They probably will work OK in grid driven fashion, but GG not so great. 807s are classic tubes though...lots of rigs used them for RF and modulators. I recall seeing a leenyar amp somewhere in a 50's era article that used 8 or 10 6AG7s, but I think it was for 75M. 73, Jack, W9GT |
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Tubes and Black Wrinkle Rule!!
73, Jack, W9GT
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SM6OID
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« Reply #13 on: August 13, 2010, 03:44:15 PM » |
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My first transmitter built in 1982 had a 6AG7 XTAL OSC and a 807 PA. (later two 807 in parallell) Operated well on 80 an 40 meters CW with 530 volts on the plate. I wonder how many transmitters that has been build using 6AG7-807  ? |
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KC4VWU
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« Reply #14 on: August 13, 2010, 04:01:13 PM » |
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'At thar is a Elkin super 12! Actually, I've been contemplating trying maybe a quad or six in PP/parallel-grid driven for a small linear to wake up some of my PW tx's signals. If you look around, you can find them for around 4 to six bucks apiece. Would probably make for a good mobile setup.
Phil
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W2PFY
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« Reply #15 on: August 13, 2010, 04:25:09 PM » |
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Here's the lid. Can't make out Elkin on the cabinet. |
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KC4VWU
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« Reply #16 on: August 13, 2010, 05:58:45 PM » |
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That's it, ESC... Electronics Service Center, Elkin, N.C. That was probably built sometime in the early to mid 60's.
I wonder how well/clean one would work set up for the lower bands? Can't be much worse than some of the sweep tube amps made by Dentron, Ameritron, and a bunch of others. Toobs way cheaper too!
Phil
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k7yoo
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« Reply #17 on: August 13, 2010, 09:04:12 PM » |
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Seeing this amp gave me a great inspiration. I figure a six pointed star layout with 12 tubes--one a each apogee and one at each perogee. The symmetry would cancel out all parasitics. Mount a roller inductor in the middle for tuning. This would be great for checking into the Marconi net. I am on it. For the truly malevolent a 5 tube pentagram version could be built for 11m.
Skippy
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K5UJ
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« Reply #18 on: August 13, 2010, 09:39:47 PM » |
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I especially like the easy acces to the plate caps and the open construction. I'm sure this will help out the gene pool.
klc
Heh, wait 'til you see my open chassis TR-1  |
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K3ZS
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« Reply #19 on: August 14, 2010, 10:38:24 AM » |
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My first transmitter built in 1982 had a 6AG7 XTAL OSC and a 807 PA. (later two 807 in parallell) Operated well on 80 an 40 meters CW with 530 volts on the plate. I wonder how many transmitters that has been build using 6AG7-807 ? The Globe Chief 90 had this tube lineup. B+ is a little less, running 90W input power at 210 mA using 2 - 807's. |
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w1vtp
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« Reply #20 on: August 14, 2010, 12:03:41 PM » |
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I especially like the easy acces to the plate caps and the open construction. I'm sure this will help out the gene pool.
klc
Heh, wait 'til you see my open chassis TR-1 Pictures please!! I love that beast Al |
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W2PFY
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« Reply #21 on: August 14, 2010, 12:34:24 PM » |
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Pictures please!! I love that beast yo Al, There are pictures above, Maybe I missed something |
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w1vtp
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« Reply #22 on: August 14, 2010, 10:25:58 PM » |
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Pictures please!! I love that beast yo Al, There are pictures above, Maybe I missed something I was referring to the TR-1 as in Eldico -- must've missed something. It had 1500 on the plate tank -- all open. It's a thing of beauty but lethel. I still love it. |
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Pete, WA2CWA
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« Reply #23 on: August 15, 2010, 12:34:15 AM » |
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Pictures please!! I love that beast yo Al, There are pictures above, Maybe I missed something I was referring to the TR-1 as in Eldico -- must've missed something. It had 1500 on the plate tank -- all open. It's a thing of beauty but lethel. I still love it. From another AMfone thread:  |
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Pete, WA2CWA - "A Cluttered Desk is a Sign of Genius"
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w1vtp
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« Reply #24 on: August 15, 2010, 08:21:33 AM » |
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Pete
YEAH! That's what I talking about! What memories! Never had an accident with that. Good thing. I wouldn't be typing this here response.
I just acquired the original manual for that beast complete with 3 x 4' schematic. Gotta get my hands on one of those. It would be full circle for me
Thanks, Al
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