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Heil Tube - or Coaxial-line velocity modulated oscillator valve

The Heil Tube is the forerunner of the Klystron. In 1935 A. Arsenjewa-Heil and O. Heil, a husband and wife team, made the tube as an RF oscillator. It works by velocity modulation of an electron beam. An RF voltage applied across the interaction region between the focus electrode and the drift tube causes this velocity modulation. Faster electrons from one cycle catch up with slower electrons from the previous cycle, which causes bunching of the electrons in the beam by the time they reach the interaction region between the drift tube and the second electrode.

Heil tube

Reference: A. Arsenjewa-Heil and O. Heil, Zeitschr. fûr Physik, Vol. 5, 1935, p. 752

This table was made up from information supplied and from observations of actual tubes:

Commercial code CV number Base Heater voltage (V) Frequency range (MHz) Minimum power output (W) Resonator voltage range (V) Cathode current (mA) Typical electronic tuning range (MHz)
V190C/1M - B8G 6.3 800-1000 2.0 180-270 80 ±2.0
V230A/1K 234 B7G 6.3 1700-3700 0.3 100-300 50-65 ±1.0
V230C/1D 230              
V233A/1K 2190 B7G 6.3 2700-4200 0.3 190-380 50-65 ±1.0
V235A/1K 2221 B7G 6.3 2700-4000 0.5 190-350 50-65 ±1.0
V237C/1K - B7G 6.3 3560-3820 0.35 225-285 45 ±4.0
V237C/2K   B7G   3560-3790 0.25 225-285 45 11
V238A/1K 5292 B7G 6.3 3550-4250 0.9 250-400 50 -
V238A/2KS       3550-4250 0.55 365-410 50 ±1
V239C/1K 5048 B7G 6.3 3780-4040 0.35 225-285 45 ±7.0
V239C/2K CV6165     3790-4020 0.25 230-280 45 11
V240C/1K - B7G 6.3 4000-4100 0.35 240-280 45 ±9.0
V240C/2K 2189 B7G 6.3 3950-4050 0.35 240-280 45 ±9.0
V241C/1K 5049 B7G 6.3 4000-4240 0.35 225-285 45 ±7.0
V241C/2K 6166 B7G   4020-4240 0.25 230-310 45 11
V243A/2FS 5463     4263-4297 0.75 235-275 65 -
V243A/3FS -              
V245C/1K - B7G 6.3 4400-4630 0.2 230-265 50 ±10.0
V246A/1K 228 B7G 6.3 4400-4850 0.45 200-250 65 ±6.0
485              
V246A/2K B7G 6.3 4560-4860 0.2 200-230 40 ±4.0
V247C/1K - B7G 6.3 4570-4750 0.2 230-265 50 ±10.0
V249C/1K - B7G 6.3 4760-5000 0.2 249-290 50 ±9.0

(For the CV485, separate examples showing V246A/1K and V246A/2K are known. The Ministry "EVS" books show CV485 as a 'selected' CV228 so the two are clearly closely related.)

Thanks to Jan Heering for providing information and reference material

 

This file was last modified 13:33:46, Thursday September 28, 2006