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Title: GL-434A tube Post by: gregry08gt500 on February 13, 2009, 04:28:10 PM Hello, I am brand new to this site I was the one who sold that "Old Buzzard Rig on ebay I am trying to sell all of my Uncle" stuff for my Aunt seeing she is on a fixed income I am running out of luck trying to find out if these GL-434A tubes have any value to anyone .I have 4 of them brand new sealed in a box. They were made by General electric any help I would be grateful thanks in advance Greg
Title: Re: GL-434A tube Post by: w4bfs on February 14, 2009, 08:43:08 AM sorry ... no data for this series...I did find a GL5xx which is a 200W triode ... will keep checking ...John
p.s. welcome to the forum Title: Re: GL-434A tube Post by: WZ1M on February 14, 2009, 09:22:50 AM GL-434/A, Xmtg, UHF triode used in the BC-677
Title: Re: GL-434A tube Post by: gregry08gt500 on February 14, 2009, 11:17:38 AM Sorry for the dumb question but what is a bc-677
Title: Re: GL-434A tube Post by: KL7OF on February 14, 2009, 12:06:18 PM there are no dumb questions....I can't help with the bc-677
Title: Re: GL-434A tube Post by: KD6VXI on February 14, 2009, 12:35:26 PM Sorry for the dumb question but what is a bc-677 Military xmitter, circa 1943. Google is your friend. --Shane Title: Re: GL-434A tube Post by: KB3DKS on February 14, 2009, 12:51:46 PM Sorry for the dumb question but what is a bc-677 Info from http://pages.cthome.net/fwc/BC-EQP.HTM BC-677 Radar Transmitter S/T BC-407 P/O SCR-268A TM 11-1060 1943 Bill, KB3DKS in 1 Land Title: Re: GL-434A tube Post by: W2PFY on February 14, 2009, 04:58:12 PM Quote UHF triode What was UHF in 1942? From my experience, tubes like that could be used up to the low band on commercial TV. They look very similar to the final in my Westinghouse MW-2. which is a Westinghouse WL5736. 2.5 KW anode rating.Title: Re: GL-434A tube Post by: k4kyv on February 14, 2009, 10:45:37 PM ...I did find a GL5xx which is a 200W triode ... What is a GL5xx? Title: Re: GL-434A tube Post by: WZ1M on February 15, 2009, 06:56:49 AM Don, maybe its a GL-509? Most GL-5xx series are thyratron or magnatrons.
Regards, Gary Title: Re: GL-434A tube Post by: w4bfs on February 15, 2009, 07:44:17 AM sorry ... I was too imprecise ... gl5xx was something like gl534 where I didn't write down last 2 numbers and wasn't sure of what they were ... if that added to confusion, I apologize ...73 ...John
Title: Re: GL-434A tube Post by: Opcom on February 15, 2009, 10:56:42 PM Hello, I am brand new to this site I was the one who sold that "Old Buzzard Rig on ebay I am trying to sell all of my Uncle" stuff for my Aunt seeing she is on a fixed income I am running out of luck trying to find out if these GL-434A tubes have any value to anyone .I have 4 of them brand new sealed in a box. They were made by General electric any help I would be grateful thanks in advance Greg Why not post a couple of pictures of one here? Are they as shown? ]]]]]]]]]]]]]]]]]]]] so far this has turned up re uses of the tube other than military radar and suggests a 2000-2500W plate dissipation: The Alvarez Linac's parameters: f 200 MHz RF Power 450 kW peak/tube Repetition Rate 15 pps RF Pulse Width 600 microseconds, 400 in flat Number EIMAC 3W10000A3 “tubes” 9 Proton Beam Energy 32 MeV Accelerator Length 40 feet Accelerating Gradient 2.6 MV/m The Alvarez LINAC ('45-'55) started with 36 war-surplus GL-434 triode tubes, with 4 tubes parallel connected to get the power. These tubes “had such a high casualty rate while in operation” (that they) had to upgrade. ]]]]]]]]]]]]]]]]]] from: http://home.comcast.net/~n6jv/gl434.html The GL-434 is a forced air cooled triode power tube (the potato masher). Used in the BC-677, but no additional data is available. Length = 5.25" Diameter = 2.50" (picture) ]]]]]]]]]]]]]]]]]]]] SCR-268, T1, A, B, C - Search Light Control Frequency: 205 MHz, 1˝ meter wavelength Power Output: 50 kw Pulse Width: 7 to 15 µseconds Pulse Repetition Rate: 4098 Range: 40,000 yards Vertical Coverage: Horizontal Coverage: Antenna: Speed: Beam Width: Indicator Type and Quantity: Manufacturer: Notes: Had a provision for data transmission to a searchlight or gun director; 1940-1945, 2,974 procured. The SCR-268 Radar; more on the radar here: http://www.mobileradar.org/radar_descptn_2.html#scr_268 ]]]]]]]]]]]]]]]]]]]] The BC-677 transmitter is described in military manual "TM 11-1060", 1943 - -this would be the best publication as to the original use of the tubes. Also see TM 11-1062. ]]]]]]]]]]]]]]]]]]]]]] finally, there is a very specific company http://www.radiores.com/ He might buy as spares. His site is worth a look for anyone!!! ]]]]]]]]]]]]]]]]]]]] What are they worth? Could not turn up more. If as implied in the LINAC data the tube works at very high frequencies, it is perhaps fun. However, the apparent scarcity of them -including- the scarcity of any info on them, as well as the unusual connection pins/socket requirement (apparently they operate anode-down as shown), may limit the "high value" of them to what someone who is currently using them, would pay for spares. The ones that would pay the most would be collectors who have the radar, a longshot to be sure. check mobileradar.org for potential customers? Tube collectors? No doubt these are fine tubes, but a ham operator would need to know some of the basic specifications before considering building with them. The manual for the BC- or SCR- might provide some information. Since Western Electric made the radars, and western electric collectors are a rabid lot, one of them might pay a fortune, if the tube (one at a time) were marketed "properly". Western Electric rare secret new in box WWII radar tube HUGE! Great for audio! blah blah blah. |