811A vacuum tube
grabcad
Ubiquitous AF & RF transmitting triode 811A, (with Thoriated Tungsten filament & Pd= 45W CCS, u=160), that served in all kind of gear, from Altec 1570B PA amplifiers in 1950-es, all through to saving the day in 1991 Operation Desert Storm (when state of the art solid state rigs failed due to desert's sand static charges)...still in production, widely available & affordable...Here is the model of the "CEI" tube, marked as "Made in Germany", probably from mid-1970-es...
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