Transmitter Tubes
There is another designation system for high-power tubes such as transmitter ones.
The 1st element (from left to right) is always G (Russian Г, for "generatornaya").
The 2nd element (with some notable exceptions such as the Г807) is:
-
- K (Russian: К) - shortwave (<= 25 MHz) tube.
- U (Russian: У) - ultra-shortwave (25-600 MHz) tube.
- S (Russian: С) - centimetric-wavelength (> 600 MHz) tube.
- M (Russian: М) - modulator tube.
- I (Russian: И) - impulse tube.
The 3rd element consists of a dash ("-") followed by the design serial number. If the tube has to be force-cooled there might follow a letter 'A' (Russian 'А') for water-cooled or 'B' (Russian 'Б') for air-cooled.
Popular transmitter tubes include the ГУ-29, ГУ-50, ГМ-70 and Г-807 (the Russian 807 analogue).
Read more about this topic: Russian Tube Designations