| First element | |
|---|
| ГК | Generator (transmitting) tubes up to 25 MHz |
| ГУ | UKF generator (transmitting) tubes 25-600 MHz |
| ГС | Centimeter range generation (transmitting) tubes |
| ГМ | Modulator tubes |
| В | High power rectifiers |
| СГ | Voltage stabilizers |
| СТ | Current stabilizers |
| Т | Thyratrons |
| ГГ | Gas-discharge rectifiers |
| ГР | Mercury gas-discharge rectifiers |
| Ф、ФЭУ | Photocells and photomultipliers |
| heater voltage | Receiving tubes |
| Screen diameter in cm | Picture tubes |
| Д | Semiconductor diodes |
| П | Transistors |
| |
| Second element | |
| Д | Diodes |
| Х | Double diodes |
| С | Triodes |
| Э | Tetrodes |
| П | Power pentodes and tetrodes |
| К | Remote cut-off pentodes |
| Ж | Sharp cut-off pentodes |
| В | Secondary emission pentodes |
| А | Mixing tubes with two signal grids |
| Б | Pentodes with one or two diodes |
| Г | Triodes with one or more diodes |
| Е | Tuning indicators |
| И | Triodes with hexode, heptode or octode |
| Н | Double triodes |
| Р | Double tetrodes and pentodes |
| Ф | Triode - pentodes |
| Ц | Rectifiers |
| Type sequence number | Gas-discharge tubes, power rectifiers |
| Г | Gas thyratrons |
| Р | Mercury thyratrons |
| Х | Cold cathode thyratrons |
| ЛО | Oscillograph tubes with electrostatic deflection |
| ЛМ | Oscillograph tubes with electromagnetic deflection |
| ЛК | TV picture tubes |
| Type sequence number | Semiconductors |
| |
| |
| Third element | |
| Type sequence number |
| |
| Fourth element | |
| none | Metal |
| С | Glass |
| Ж | HF glass, side leads |
| К | Ceramic |
| П | Miniature glass 19 and 22.5 mm |
| Г | Subminiature > 10 mm |
| Б | Subminiature 10mm |
| Р | Subminiature 4 mm |
| А | Subminiature 6 mm |
| Л | lock-in-key |
| Д | Disc leads |
| А | Water cooled |
| Б | Air cooled |
| letter | Luminophor color code |
| X/Y | X = average current in A |
| Y = reverse voltage amplitude in kV |
| |
| After symbol dash and postfix | |
| |
| В | high reliability tube (military) |
| Е | long life tube (military) |
| И | designed for impulse operation |
| К | vibration resistant |
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