Description of the tester
The tester is housed in a wooden case with leather handle, lined with brown paper with leather print. Black aluminum front plate with white print. Suitable for the measurement of emission of electron tubes and the value of resistors and capacitors. The tester can alsio be used to measure voltages and currents. Made by E.N.B. (E.N. Batlouni) Laboratoire Industriel Radioélectrique, 25, rue Louis-Le-Grand, Paris 2e.
Left of the meter with the indications "resistances" (0-10000 ~ Ω) and "capacités" (0-10 ~ uF) and the blue, white and red markings with the texts "mauvaise" (bad), "douteuse" (doubtful) and "bonne" (good) is the switch for the filament current with the positions: 1.5 ∙ 2 ∙ 2.5 ∙ 4 ∙ 5 ∙ 6.3 ∙ 7.5 ∙ 12 ∙ 20 ∙ 24 ∙ 30 and 40 volts. Above the entrance of the power cord is a jumper for the AC voltage. Bottom right is the on/off switch, surmounted by a number of connections that can be used for connecting a resistor or a capacitor for testing.
There are 25 tube sockets with a number of different versions of a single tube type, such as the octal base, the UX7 base and the P-base. Sockets H and Z were reserved for "future" tubes. This tester has the G8A/Y8A base and an extra octal base. Below are 9 sockets that can be used for manually connecting tubes via measuring cables. Socket 1 is used to connect the top connection of a tube; socket 0 is used to connect the cathode and socket 6 is used for a possible 2nd cathode.
The tester has an isolating transformer, so that the metal parts or the metal paint of a tube can be touched safely.
The original price of the tester was Ffr 1475,-
Filament, short circuit and emission test
On the right of the meter is a switch that can be used for the the different measurements. The filament can be tested in position F,  the electrodes can be checked for short circuits in positions 1 - 6, the emission can be determined in positions 7 -9 and the cathode can be isolated in position 0.
Measuring resistors and capacitors
In position M, the value of a capacitor (in the range 0,1-10μF and 0,01-1μF) or a resistance (in the range of up to 10,000Ω and up to 100,000Ω) can be determined. When testing resistors above 10000Ω the value should be multiplied by 10; when testing capacitors in the range 0,01-1μF the value must be divided by 10.
After the shorting plug "Cond. Élec." is removed, an electrolytic capacitor can be connected between the terminals - and +. A working tube must also be inserted in one of the sockets of the tester, so a DC voltage is present. In this way, the leak of this capacitor can be determined. The dynamic behavior of the meter makes is possible to see if a capacitor has a large capacity or a smaller capacity.
Measurement of voltages and currents
When measuring voltages and currents, the plug of the tester must be shorted. The filament current switch must be put at 1,5 V and the measurement switch to M. Voltages up to 20 V can now be measured by connecting it at the two buses with the inscription "10.000Ω-10uF". Voltages up to 60 volts are connected between the central bus and the lower bus and voltages in the range of 200 volts at the busses for 100.000Ω-1uF. When the reading the value, the IRV list in the lid can be used. There is no multiplication factor for 20 V, X 3 for 60 V and X 10 for 200 V.
The measurement of currents, is carried out in approximately the same way. The current is applied to the buses for 10.000Ω-10uF. Position 0 is used for the measurement of currents larger than 12.5 mA. Currents up to 12.5 mA can be read directly; in the highest position the reading should be multiplied by 4.
The tester was sold in 2021.
The meter can be used for measuring emission and for measuring resistors and capacitors.

Tube sockets1
A B3/B4/B5 J UY5 S K8A, IO (International Octal)
B B3/B4/B5 K UY5 T K8A, IO (International Octal)
C B5G, E34, O2 L UX4 U K8A, IO (International Octal)
D B/C M UX6 V K8A, IO (International Octal)
E P5, Ct5 N UX6 X K8A, IO (International Octal)
F P8A, Ct8 O UX7 Y B8G (Loctal)
G P8A, Ct8 P UX7 Z3 K8A, IO (International Octal)
H3 Y8A, G8A Q UX7    
I B7 R UX7    
1) see the user manual for a list of tubes and sockets
2) for instance a DW1B or a TM4Q
3) the bases H and Z were reserved for "future" tubes
Data
Serial number none  
Dimensions (h x w x d) 16 x 36 x 31.5 cm  
Made in ± 1940 Circuit and description (in French)
Purchased in 2016 User manual and tube list (in French)
Weight 4 kg
AC voltages 110, 130, 150, 220 and 250 volts
Under-chassis view
The value of some carbon resistors was customized by filing out a piece of carbon.

Advertisement for the tester in "Le Haut-Parleur", 1941

This page was last edited on 09.05.2021