| 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.
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 |
| V218A/1K |
- |
? |
? |
1700-2000 |
0.5 |
200-300 |
50 |
- |
| V230A/1K |
234, 299 |
B7G |
6.3 |
1700-3700 |
0.3 |
100-300 |
50-65 |
±1.0 |
| V230C/1D |
230 |
|
|
|
|
|
|
|
| V231C/1K |
- |
? |
? |
3060-3180 |
0.05 |
180-240 |
45 |
±8 |
| 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 |
6165 |
|
|
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 and Frank Philipse for
providing information and reference material
|
