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Frank's Electron tube Pages
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1st letter | heater indication |
0 | tubes without filament |
A | 4 V AC parallel connection |
B | 180 mA DC |
C | 200 mA AC/DC series or parallel connection |
D | <= 1.4 V DC dry-battery, parallel connection |
E | 6.3 V AC or carbattery, parallel connection |
F | 13 V carbattery |
G | 5V AC parallel connection |
H | early: 4V DC battery. later: 150mA AC/DC series connection |
I | 20V AC/DC parallel connection |
K | 2 V battery |
O | 150 mA AC/DC series connection |
P | 300 mA AC/DC series connection |
U | 100 mA AC/DC series connection |
V | 50mA AC/DC series connection |
X | 600 mA AC/DC series connection |
Y | 450 mA AC/DC series connection |
2nd+next letters | tube systems |
A | single detection diode |
B | double detection diode |
C | small-signal triode |
D | power triode |
E | tetrode (or 2nd emmission tube EE1) |
F | small-signal pentode |
H | hexode or heptode |
K | octode |
L | power pentode |
M | indicator tube |
N | thyratron |
Q | enneode |
W | single gasfilled rectifier diode |
X | double gasfilled rectifier diode |
Y | single vacuum rectifier diode |
Z | double vacuum rectifier diode |
digits | socket & order |
x | P (some are V) |
1x | Y8A |
2x | W8A, Loctal (except UY1 and D?2x types types which are octal) |
3x | K8A, A08, octal |
4x | A8A, B8A, Rimlock |
5x | T9A, B9G, Enne-al and C2R and some special bases |
6x | Subminiature |
7x | Subminor8p |
8x, 18x, 8xx | B9A, noval |
9x, 19x, 9xx | B7G, miniature-7p |
2xx, 2xxx | decal |
5xx | B9D, magnoval |
Examples | Description |
CBL1 | output pentode with dual detection diode, heater 200mA, P base |
EABC80 | tripple signal diode with triode, heater 6.3V, noval base |
ECC83 | dual triode, heater 6.3V, noval base |
GZ34 | dual vacuum rectifier, heater 5V, octal base |
PFL200 | pentode and power pentode, heater 300mA, decal base |
UCH21 | triode and heptode, heater 100mA, base loctal |
1st letter | heater current |
A | 0.06 to 0.10 A |
B | 0.10 to 0.20 A |
C | 0.20 to 0.40 A |
D | 0.40 to 0.70 A |
E | 0.70 to 1.25 A |
F | > 1.25 A |
2nd digit or 2nd+3rd digits | heater voltage |
x | heater voltage < 10 V |
xx | heater voltage >= 10V |
last 2 digits | description |
xx | amplification factor for triodes |
41, 51 etc | tetrode with spacecharge grid (2nd grid is control grid) |
42, 52 etc | tetrode with screen grid (1st grid is control grid) |
43, 53 etc | power pentode |
44, 54 etc | triode with diode or tetrode with diode |
45, 55 etc | hf tetrode with variable gain |
46, 56 etc | hf pentode |
47, 57 etc | hf pentode with variable gain |
48, 58 etc | hexode frequency changer |
49, 59 etc | hexode with variable gain |
Suffix letter | Description |
H | ? |
N | ? New, later version |
S | ? Series connection allowed |
T | ? |
Examples | Bases usually: A or O |
E499 | triode, If=1A , Vf=4V, gain=99 |
F443N | power pentode, If=2A, Vf=4V |
B2046 | hf pentode, If=0.18A, Vf=20V |
MAZDA NUMBERING SYSTEM Signal valves
First number indicates heater or filament rating | |
1 | 1.4V (parallel or series) |
6 | 6.3V (parallel or series) |
10 | 0.1A (series) |
20 | 0.2A (series) |
30 | 0.3A (series) |
Following letter or letter sequence indicates class of valve | |
C | Frequency changer with special oscillator section |
D | Signal diode(s) |
F | Voltage amplifier tetrode or pentode |
FD | Voltage amplifier tetrode or pentode with diode(s) |
FL | Voltage amplifier tetrode or pentode with voltage amplifier triode |
K | Small gas triode or tetrode |
L | Voltage amplifier triode or double triode including oscillator triode |
LD | Voltage amplifier triode with diode(s) |
M | Tuning indicator |
P | Power amplifier valve, tetrode or pentode |
PL | Power amplifier valve, tetrode or pentode with voltage amplifier triode |
Final number distinguishes between different valves in the same class |
MAZDA NUMBERING SYSTEM Power rectifier valves
Letters indicates heater or filament rating | |
U | High vacuum half-wave |
UU | High vacuum full-wave |
Final number distinguishes between different valves in the same class |
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 | ||
---|---|---|
none | Metal | Receiving tubes; voltage and current stabilizers |
![]() | Glass | |
![]() | HF glass, side leads | |
![]() | Ceramic | |
![]() | Miniature glass 19 and 22.5 mm | |
![]() | Subminiature > 10 mm | |
![]() | Subminiature 10mm | |
![]() | Subminiature 4 mm | |
![]() | Subminiature 6 mm | |
![]() | lock-in-key | |
![]() | Disc leads | |
![]() | Water cooled | Generator (transmitting) and modulator tubes |
![]() | Air cooled | |
letter | Luminophor color code | Picture tubes |
X/Y | X = average current in A Y = reverse voltage amplitude in kV | Thyratrons (non cold cathode), Gas-discharge, power rectifiers |
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]![]() | [A] is the current (in amperes) and [V1-V2] is voltage range |