How to use the Tube Tester W19?
Very simple!

TEST PREPARATION:

From the tube lists one chooses the corresponding test card and puts it on the pins of the tester, then plugs are placed in all holes of the card and everything necessary is connected in the right way automatically, then the tube is put in the socket marked by an arrow on the card.

TESTING:

The only selector switch is turned through all positions. In the first 10 positions the tube is tested with regard to mechanical faults, If there is something wrong (filament burnt-out, short or leakage) the meter will point to „Fehler“ (that is „Fault“), then the tube cannot be used, thus, the test is finished. If there is nothing wrong the tube is tested electrically in position 12. The reading of the card states the limits of the meter indication between which the tube is to be considered as „good“, as „weak“ or as „bad“. If more tests are necessary a notice at the right top corner of the card will say so, for many tubes this notice reads:

In position 13 is to
prove to control grid.

Then one turns to pos. 13 and if the meter indication goes back the tube is all right and the noise test can be made. In pos. 14 the vacuum is checked.

Test cards for full-wave rectiviers containing 2 Systems have the remark:

2. System is measurable
in position 11

Then one goes back to pos. 11 and checks wheter the second system is „good“ or „weak“ or „bad“, Even then no mistake is possible for in this case the switsch is blocked automatically and cannot be turned to pos. 13.

Thus the test is finished.

Finally the selector switsch is turned back to position „Aus“, that is „Off" and a test result sticker is put on the tested tube. (1000 stickers are supplied with the Tube Tester W 19).