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System of a designation of the Russian radio tubes, made in the USSR, made under the standard GOST 13393-76 and have usually four elements.

The first element - number, means a аilament voltage in volt (approximately).

The second element - letter, designating type of the device:

D - diode, including dempfers;
H - double diode;
C - low-power kenotron;
S - triode;
N - double triode;
E - tetrode;
P - output pentode and beam tetrode;
J - high-frequency pentode with short characteristic, including with double management;
K - high-frequency pentode with long characteristic;
R - double tetrode and double pentode;
G - diode-triode;
B - diode-pentode;
F - triode-pentode;
I - triode-geksode, triode-geptode, triode-oktode;
A - frequency-converting tubes and tubes with two operating grids (except for pentodes with double management);
V - tubes with secondary issue;
L - tubes with focused beam;
E - electron-beam indicators of adjustment.

For electronic mehatrons the second element of a designation is made of three letters: the first M - mehatron; the second letter corresponds to the basic purpose of the device (in some designations mehatrons, developed earlier, this letter is absent); the third letter designates type of the device according to the list resulted above.

The third element - number, corresponding a serial number of the given type of a tubes.

The fourth element - letter, describing constructive desing of a tubes:

P - in a glass environment, tiny (finger-type), diameter 19 and 22.5 mm;
A - in a glass environment, supertiny, diameter from 5 up to 8 mm;
B - in a glass environment, supertiny, diameter from above 8 up to 10.2 mm;
G - in a glass environment, supertiny, diameter over 10.2 mm;
S - in a glass environment, with a socle or without a socle, diameter more than 22.5 mm;
N - in a ceramic-metal environment, tiny and supertiny;
K - in a ceramic environment;
D - in a metal-glass environment, with disks.

Lamps in metal to an environment of the fourth element of a designation no have.

Additional element. To a standard designation of a tube are sometimes added (after a hyphen) the letters describing special properties of lamps, for example:

B - tubes of raised reliability and mechanical durability;
E - tubes of the raised durability (5 thousand hour and more);
D - tubes especially durable;
I - tubes, intended for work in a pulse mode.

Example for 6P14P-ER tube (more exact data are checked on DataSheets):

6 - filament voltage, 6,3V;
P - output pentode;
14 - serial number of type of a tube;
P - envelope: miniature, glass;
ER - operation time, >10000h

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