FUNKE TUBE TESTER / Model W 19.

A reliable Tube Tester which may be used without concentrating on the test. Considering the number of tube types on the market which increases from week to week it is necessary to know how to test each type or at least, to have all their data.

In many cases tubes are tested by untrained sales clerks or even by a member of the dealer’s family. In our tube tester a test card (punched card) is used for each tube thus excluding any mistake and allowing the customer to control the dealer at the test.

These are the main features of our Tube Tester:

All currents and voltages needed for the test are available from the built-in power supply which is adjustable for 110; 125, 150; 220, 250 volt AC. The fuse of 1.0 amp. for 150; 220; 240 volt or of 1.5 amp. for 110 and 125 volt may be replaced from the front panel.

By the use of test cards (punched cards) mistakes and errors ate not possible even for untrained people.

There is only one control switch with which all tests are made in the tight sequence. All switch positions which are not needed for a special type or could cause errors are blocked automatically, thus making the device foolproof.

In the second switch position i. e. after the filament continuity test the tube receives the right filament voltage. Thus all short tests are made while the tube is heated. This feature is important since many shorts occur only when the tube is heated,

The main selector switch provides the right testing sequence automatically. There are not several push buttons to be pressed independently, therefore, no test can be forgotten, when turning the only switch, one makes one test after the other without being able to miss one. Thus, again the device is foolproof.

Mechanical faults (like burnt-out filaments, shorts or leakage) are shown by the meter which gives a deflection to the left, where the word „Fehler“ that is „Fault“ is marked, This is true for all mechanical faults, (In most of the other testers the indication is confusing, because during the filament continuity test a neon bulb is supposed to light and during the shorts tests, not to light if the tube is all right; in our tube tester the fault indication is always the same) Again, our tube tester is foolproof.