typenummer

TYPE NUMBER SYSTEM

Below the present type number system is given for tubes having type numbers which provide information concerning electrical data, principal uses bases etc. of the tube. It is pointed out, however, that in a few instances it has not been possible to adhere strictly to this system.

	RECEIVING AND AMPLIFYING TUBES
	SPECIAL TUBES
	CATHODE -RAY TUBES
	TRANSMITTING TUBES
	PHOTOTUBES
	VOLTAGE STABILIZERS

RECEIVING AND AMPLIFYING TUBES

The type number consists of a number of capital letters followed by either one or two figures (e.g. EF 6, UCH 81).

First letter: indicates the filament rating.
Second and subsequent letters: indicate the type classification.
Figures: indicate a serial number.

The key to this system is given in the following tables.

First letter:

Second and subsequent letters:

A	-	4V
C	-	200mA
D	-	1,4 V battery
E	-	6,3 V
G	-	5V
K	-	2 V battery
O	-	Semi-conductor
P	-	300 mA
U	-	100 mA
Z	-	Cold cathode

A	-	R.F. single diode
B	-	R.F. double diode
C	-	Triode (except output and gasfilled triodes)
D	-	Output triode
E	-	Tetrode (except output tetrodes)
F	-	Pentode (except output pentodes)
H	-	Hexode or heptode
K	-	Octode or heptode
L	-	Output tetrode or pentode
M	-	Tuning indicator
P	-	Tube with secondary emission system
Q	-	Enneode
T	-	Miscellaneous
X	-	Full-wave gasfilled rectifying tube
Y	-	Half-wave high-vacuum rectifying tube
Z	-	Full-wave high-vacuum rectifying tube

Figures:

Serial number

SPECIAL TUBES

(Reliable, ruggedized, long life tubes, etc.) The system is similar to that of receiving and amplifying tubes, however, the figures are placed between the letters (e.g. E 80 F, E 90 CC).

CATHODE-RAY TUBES

The type number consists of two capital letters followed by two sets of figures (e.g. DG 13-2, MW 31-16).

   First letter: indicates the method of focusing and deflection.
   Second letter: indicates properties of the screen.
   First group of figures: indicates dimensions of the screen.
   Second group of figures: indicates a serial number.

The key to this system is given in the following tables.

First letter: Second letter:

D - Electrostatic focusing and electrostatic deflection in two directions.

M - Electromagnetic focusing and electromagnetic deflection.

B - Bluish fluorescence, short persistence (l %. of max. brightness after 0.01 sec).

F - Orange fluorescence, very long persistence (0.1% of max. brightness after 75 sec).

G - Green fluorescence, medium persistence (1% of max. brightness after 0.05 sec).

N - Green fluorescence, long persistence (0.1% of max. brightness after 6.4 sec).

P - Double layer screen, bluish fluorescence of short persistence followed by greenish-yellow fluorescence of very long persistence (0.1% of max. brightness after 80 sec).

R - Greenish-yellow fluorescence, long persistence (0.1% of max. brightness after 20 sec).

W - White fluorescence, medium persistence.
Direct-viewing tubes: color temp. 8000⁰ K
Projection tubes: color temp. 5500⁰ K

First group of figures: Second group of figures:

For round tubes: screen diameter in cm

For rectangular tubes: screen diagonal in cm

Serial number

TRANSMITTING TUBES

Rectifying tube (included grid-controlled tubes}

   First letter: indicates the tube classification.
   Second letter: indicates type of filament or cathode.
   First group of figures: indicates operating voltage.
   Second group of figures: indicates power.
Added letters: indicate the tube base.

The key to this system is given in the following tables.

First letter:
For tubes having dual systems two of the above mentioned letters are used (e.g. QQC 04/15). Second letter:
(Third letter for tubes having dual systems) Third letter:
(Fourth letter for tubes having dual systems)

D - Rectifying tube (included grid - controlled tubes}

M - Triode (A.F. amplifying tube or modulator

P - Pentode

Q - Tetrode

T - Triode (R.F., A.F. or oscillator tube)

A - Directly-heated tungsten filament

B - Directly-heated thoriated tungsten filament

C - Directly-heated oxide-coated filament

E - Indirectly-heated oxide-coated cathode

G - Mercury-vapour filling

L - Forced air cooling

W - Water cooling

X - Xenon filling

When the type number does not contain a letter indicating the cooling, the tube is radiation cooled.

First group of figures: Second group of figures: Added letters:

Rectifying tubes: Approx. D.C. output voltage in kilo-volts in a three-phase half-wave rectifying circuit.

Transmitting tubes: Approx. max. Anode voltage in kilo-volts.

Rectifying tubes: Approx. D.C. output power in watts or kilowatts per tube in a three-phase half-wave rectifying circuit.

R.F. tubes: Approx. output power in watts or kilowatts in class C telegraphy.

Modulators: Approx. anode dissipation in watts or kilowatts.

B - Cables

E - Medium 7p. -base

ED - Edison base

EG - Goliath base

G - Medium 4p.-base

GB - Jumbo 4p.-base

N - Medium p.-base

P - P-base

PHOTOTUBES

The type number consists of two figures followed by two letters (e.g. 90 AV).

    First figure: indicates the tube base.

    Second figure: indicates a serial number.

    First letter: indicates the type of cathode.

    Second letter indicates the class of phototube.

The key for this system is given in the following tables.

First figure: Second figure:

2 - Loctal 8p.-base

3 - Octal 8p.-base

5 - Special base

8 - Noval 9p.-base

9 - Miniature 7p.-base

Serial number

First letter: Second letter:

A - Caesium-antimony cathode (blue sensitive)

C - Caesium-on-oxidized-silver cathode (red sensitive)

G - Gas filled

V - High vacuum

VOLTAGE STABILIZERS

The type number consists of a number followed by a capital letter, a figure and in some cases by a second capital letter (e.g. 85A2, 150 C 1K).

Number: indicates burning voltage.

First letter: indicates the current range.

Figure: indicates a serial number.

Second letter: indicates the tube base.

The key for this system is given in the following tables.

Number : First letter: Figure: Second letter:

Average burning voltage in volts

A - max. 10 mA

B - max. 22mA

C - max. 40mA

D - max. 100 mA

E - max. 200mA

Serial number

E - Edison

K - Octal 8p.-base

P - P-base

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Number:	indicates burning voltage.
First letter:	indicates the current range.
Figure:	indicates a serial number.
Second letter:	indicates the tube base.