Hmmm, Well it seems like the ads claim is true, verified by Mahlon, K4OQ. In that case I reiterate, this is "one heck of a deal". Try pricing the 6L6GC from any source NOS or new, and compare. How many AM rigs use the 6L6 asmodulators?Johnson Ranger (is this correct?) 16147027 How many others?Here are a couple more references about the 6L6 and its history, anddescendants:http://listserv.tempe.gov/admin/WA.EXE?A2=ind9712&L=boatanchors&D=0&P=14006"The first American television horizontal amplifier or "sweep" tube, the 6BG6G,came out in 1946., and was a repackaged 6L6". http://en.wikipedia.org/wiki/6L6One of the largest post-WWII applications was in the basic design oftelevision sweep power tubes, starting with the 6BG6 (1946), a modified 807.6L6From Wikipedia, the free encyclopediaJump to: navigation, search Pair of 6L6GC tubes; (l) General Electric version from 1960s, (r) currentmanufacture from Svetlana Electron Devices, RussiaPair of 6L6GC tubes; (l) General Electric version from 1960s, (r) currentmanufacture from Svetlana Electron Devices, Russia6L6 is the designator for a vacuum tube introduced by Radio Corporation ofAmerica RCA United States in July 1936.RCA obtained the design for the "kinkless tetrode" or Beam tetrode from British firm Marconi & Osram Valve (MOV) through a design share agreement,although RCA's own engineers were developing similar designs at that time.The 6L6 is a descendant of the "Harries Valve" developed by British engineer J. Owen Harries and marketed by the Hivac Co. Ltd. in 1935. Harries is believed to be the first engineer to discover the "critical distance" effect, which maximized the efficiency of a power tetrode by positioning its anode at a distance which is a specific multiple of the screen grid-cathode distance. This design also minimized interference of secondary emissionelectrons dislodged from the anode.EMI engineers Cabot Bull and Sidney Rodda improved the Harries design with a pair of beam plates, connected to the cathode, which directed the electron streams into two narrow areas and also acted like a suppressor grid to absorb some secondary electrons. The beam design was also undertaken to avoid the patents which the giant Philips firm held on power pentodes in Europe. Because this overall design eliminated the "tetrode kink" in the lower parts of the tetrode's voltage-current characteristic curves (which sometimes caused tetrode amplifiers to become unstable), MOV marketed thistube family under the sobriquet "KT", meaning "kinkless tetrode".Because MOV's engineers did not feel the kinkless tetrode could be successfully mass-produced, they licensed the design to RCA--which proved to be a poor business decision on MOV's part. RCA subsequently had enormous success with the 6L6. It replaced the use of power triodes in public-address amplifiers almost overnight. So many applications were found for the 6L6 that a complete list would be impossible to assemble. MOV introduced theirversion, KT66, a year later.RCA's first version had a metal-canister shell rather than glass--being one of the early octal base tubes, most of which were marketed as having metal shells (some radio users were nervous about being injured by glass from a broken tube). Later versions, including the 6L6G, 6L6GA, 6L6GB, 5881, 5932, and the final version 6L6GC had glass envelopes, which made radiation cooling of the anode easier. The original metal version was rated for 19watts dissipation, while the 6L6GC is usually rated for 30 watts.The list of variations of the 6L6 design would fill a fat textbook. Early variations included transmitting tubes such as the 807 (1937) and the giant 813 (1938), the smaller 6V6 (1937), the many KT versions marketed in Europe, and a subsequent vast array of audio and RF power tubes. One of the largest post-WWII applications was in the basic design of television sweep power tubes, starting with the 6BG6 (1946), a modified 807. TV sweep tubes werenot replaced by transistors in earnest, until the 1970s.Further testimony for this device's success would be even simpler: the 6L6GC version is still being manufactured and used, primarily in guitar amplifiers. Manufacture continues in Russia (2 factories), China (2 factories), Slovakia and Serbia. Thus, the 6L6 has enjoyed one of thelongest active lifetimes of any electronic component; almost 70 years.-- No virus found in this outgoing message. Checked by AVG Free Edition.Version: 7.1.375 / Virus Database: 268.1.1/271 - Release Date: 2/28/2006______________________________________________________________ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
The Elmac A-54H (my mobile XMTR) uses 6L6s in the modulator.
-Larry/NE1S
Jim candela writes:
- [AMRadio] Re: 6BG6 ad ne1s
- [AMRadio] RE: 6BG6 ad Mahlon Haunschild
- Re: [AMRadio] RE: 6BG6 ad Jim Candela
- Re: [AMRadio] RE: 6BG6 ad Brian Carling
- Re: [AMRadio] RE: 6BG6 ad Brian Carling