Russian tube codes:

Compiled by Frank Philipse. The regulation GOST 5461-59 applies to tubes manufactured from 1959 and semiconductors manufactured from 1959 to 1963. Every symbol consists of four elements. If an element is absent, a dash should be written at its place.
Note: There are exceptions. Not all Russian tubes are numbered according this system.

First element.

- Generator (transmitting) tubes up to 25 MHz
- UKF generator (transmitting) tubes 25-600 MHz
- Centimeter range generation (transmitting) tubes
- Modulator tubes
- High power rectifiers
- Voltage stabilizers
- Current stabilizers
- Thyratrons
- Gas-discharge rectifiers
- Mercury gas-discharge rectifiers
, - Photocells and photomultipliers
Approximate (usually full volts) heater voltage - Receiving tubes
Screen diameter in cm - Picture tubes
- Semiconductor diodes
- Transistors

Second element.

- Diodes
- Double diodes
- Triodes
- Tetrodes
- Power pentodes and tetrodes
- Remote cut-off pentodes
- Sharp cut-off pentodes
- Secondary emission pentodes
- Mixing tubes with two signal grids
- Pentodes with one or two diodes
- Triodes with one or more diodes
- Tuning indicators
- Triodes with hexode, heptode or octode
- Double triodes
- Double tetrodes and pentodes
- Triode - pentodes
- Rectifiers
Type sequence number - Gas-discharge tubes, power rectifiers
- Gas thyratrons
- Mercury thyratrons
- Cold cathode thyratrons
- Oscillograph tubes with electrostatic deflection
- Oscillograph tubes with electromagnetic deflection
- TV picture tubes
Type sequence number - Semiconductors

Third element.

Receiving, picture, generator and modulator tubes, voltage and current stabilizers, photocells and photomultipliers,
cold cathode thyratrons - Type sequence number
Semiconductors - Subtype, group (letter)

Fourth element.

Receiving tubes, voltage and current stabilizers:
none - Metal
- Glass
- HF glass, side leads
- Ceramic
- Miniature glass 19 and 22.5 mm
- Subminiature > 10 mm
- Subminiature 10 mm
- Subminiature 4 mm
- Subminiature 6 mm
- lock-in-key
- Disc leads

Generator (transmitting) and modulator tubes:
- Water cooled
- Air cooled

Picture tubes:
letter - Luminophor color code

Thyratrons (non cold cathode), Gas-discharge, power rectifiers:
X/Y - X = average current in A, Y = reverse voltage amplitude in kV

After symbol dash and postfix of one or more letters may be added:

- high reliability tube (military)
- long life tube (military)
- designed for impulse operation
- vibration resistant

Current Regulators.

[A][V1-V2] - [A] is the current (in amperes) and [V1-V2] is voltage range