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Eurelec vacuum tube tester
Here's a link to the history of
the Eurelec vacuum tube testers (in French,
here's a Google translate version (2016-01-25)).
According to this page, these testers were known as Euratele in Germany and Elettra in Italy.
This explains the similarity to the Euratele unit shown on
page (in German,
here's a Google translate version (2016-01-25)
-- Thanks to Carsten Falck for the pointer).
Based on this, here's what I could figure out:
- These units were built by the students at the radio school (I inherited this one from a
French fellow my grandmother knew, along with a
signal generator I will
undoubtedly find again some day).
- It's used with a multimeter they undoubtedly also built. The multimeter has "LM" and
"CC" terminals which are connected to the "LM" and "CC" terminals
on the Eurelec tube tester ("LM" = Lampemètre, the German version terminal is marked
"RP" = Röhrenprüfgerät).
- This multimeter has an FSD of 1mA and a series resistance of 72 ohm (in this mode).
- The multimeter scale is marked "BAD" to about 40% of FSD and "GOOD" from 56% up.
- The multimeter is bypassed by the "Emission" potentiometer, so that the multimeter
measures a percentage of the current according to the potentimeter setting.
|Pot Setting||Rbc||% Current through meter|
- You have to look up the settings in tables in the
This gives you the potentiometer setting and the connections for any specific vacuum tube.
"A" is the high-voltage supply and "B" is 0V.
- You can turn the pot to 100%, use a standard multimeter and scale the display to give you
the current through the tube. Or you can build a meter just for this purpose, schematics
on the two websites above.
- You can also check to see whether there are shorts between the anode and grid(s) and the
cathode. Switching to "CC" ("Court-Circuit" i.e. short circuit) mode
connects 6.3V to the "A" rail with the red lamp in series. A short between
"A" and "B" will light the lamp.
hits since 2015-03-11.
(This page last modified