Soviet/Russian designation system

For example: 6Н1П-ЕВ
1st letter
ГК generator tubes up to 25 MHz
ГУ generator tubes 25-600 MHz
ГС generator tubes cm range
ГМ modulator tubes
В high power rectifiers
СГ voltage stabilizers
СТ current stabilizers
Т thyratrons
ГГ gas-filled rectifiers
ГР mercury-gas-filled rectifiers
Ф, ФЭУ photocells and photomultipliers
x, xx receiving tubes heater voltage
x, xx screen diameter of picture tubes in cm
Д semiconductor diodes
П transistors

next letter(s) construction
Д diode
Х duodiode
С triode
Э tetrode
П power pentode and tetrode
К remote cut-off pentode
Ж sharp cut-off pentode
В secondary emission pentode
А mixing tube with two signal grids
Б pentodes with one or two diodes
Г triodes with one or more diodes
Е tuning indicator
И triodes with hexode, heptode or octode
Н duotriode
Р duotetrode and -pentode
Ф triode-pentode
Ц rectifier
type number gas-filled tubes, power rectifier
Г gas-filled thyratron
Р mercury-gas-filled thyratron
Х cold cathode thyratron
ЛО oscilloscope tubes with electrostatic deflection
ЛМ oscilloscope tubes with electromagnetic deflection
ЛК TV picture tube
type number semiconductors

next letter(s) other
type number receiving, picture, generator and modulator tube, stabilizer, photocell, photomultiplier and cold cathode thyratron
subtype semiconductors

next letter(s) bulb, base
general tubes
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
generator, modulator tubes
А water cooled
Б air cooled
picture tubes
letter luminophor color code
thyratrons and gas-filled power rectifiers
I/U average current/reverse voltage amplitude [A/kV]


next letter(s) (optional)
В high reliability tube (military)
Е long life tube (military)
И designed for impulse operation
К vibration resistant


next letter(s) current regulators only
I Б U1-U2 current and voltage range [A][V]