The 6C4 is one of the first miniature tubes issued. The "double" 6C4 is a 12AU7. The 6100 is the Industrial number for a 6C4, which bears the 6189 number in the double version. Both the 6C4 and the 6100 have 6.3V, 150mA filaments. The 6135 is a "ruggedized" version of the 6C4: 6.3V, 175mA filament, the double version being a 5814. If the "A" suffix is added to any of those tube numbers, it means that the heater warm-up time is controlled for use in series strings of filaments. The W suffix indicates a military spec. version, like the 6C4WA.
However, stay away of the "dwarf" sized 6C4W branded Raytheon, because it is not a "real" 6C4 and does not behave well as a frequency mixer compared to the standard 6C4 variants. 73, Jacques, VE2JFE in Montreal ______________________________________________________________ R-390 mailing list Home: http://mailman.qth.net/mailman/listinfo/r-390 Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
