Tube tester
Lectern model in wooden suitcase, covered with black leatherette. The tester can be used for emission and leakage tests. Made by Télémesure around 1939. The company was founded in 1932. In 1946 Télémesure was taken over by Manufacture d'Appareil Radio-Électrique du Rhône (MARER), 39 Route de Vaulx, Lyon-Villeurbanne. Télémesure remained one of the brand names of MARER. Under this brand name more measuring equipment was made. In 1945 they made the Radio-Test R4 voltmeter and the tube tester Major; in 1946 the valve tester L46 and in 1948 the L48A.
Description of the tube tester
A position switch for the filament current is located below the meter (scale 0-50 mA). Positions: 2, 2.5, 4, 5, 6.3, 7.5, 10, 13, 16, 20, 25 and 30 volts.
A switch with the text "Essai/Mesure" is situated on the left of the position switch. In the upper position, the filament can be tested, a measurement can be performed with the switch in the lower position.
To the right of the position switch is a push-button, that can be used to insulate the filament from the cathode.
Right below the position switch, test leads and a jumper can be used. The two upper contacts, labeled "L", can be used for a continuity test.The jumper in the middle is an interconnection for the test voltage. This connection can also be used to insert 70 volts DC for measuring capacitors. The two lower contacts, labeled "M", can be used for leakage testing. The neon tube serves as an indicator.
The filaments connections are hardwired; the switches, numbered 1 to 8, can be used to convert a measurement voltage of 110 volts on one of the other tube pins. Because the tube tester is only suitable for pre-war tubes with a maximum of 8 pins, only the first 6 switches are used. Switch 7 switches the top connection (orange and black bus) and the central pivot of a loctal tube. Switch 8 can be used in case of an extension.
On the left and right there are two strips with tube sockets, numbered from 1 to 9 (left: 1-4, 5-9 on the right), numbered from bottom to top. Another row of tube sockets is situated at the top. The left base could be used as extra, in this case a B7 base.
Strips   Upper row from left to right
1 B3/B4/B5/B6 B7
2 B5G, E34, O B8G (Loctal)
3 B7B, Q* K8A, IO (International Octal)
4 B/C Y8A, G8A
5 UX4 P5, Ct5
6 UY5 P8A, Ct8
7 UX6 Mains selector: 110, 130, 150, 220 volts
8 UX7  
9 U7B  
            *) e.g. for a DW1B or a TM4Q
Right of the left tube strip are two indicators: green: filament ok, red: short circuit.
On the right of the indicator lamps is a neon lamp with a printed scale (1-10). It serves as an indicator tube for a leakage test.
Warning: when the tube tester is connected to the mains, high voltages can be present on the metal parts or the metal paint of the tube that is being tested!
Serial number none  
Dimensions (h x w x d) 11/15 x 37.5 x 27 cm  
Made in ± 1939 Circuit
Purchased in 2015 Tube sockets and switches + quick reference
Weight 3,6 kg  
Bottom of the chassis plate

Picture from the user manual

This page was last edited on 28.08.2021