Calstan Battery Operated Tube Tester D222

6 Volt DC Powered Valve Tester.

Country Dealers will find the Calstan DC Tube Checker a sound investment. These times are busy times for Radio Dealers . . . many new sets are installed . . . These sets require new valves . . . and in turn these valves must be tested for efficiency before being placed in the set. At the same time dealers must be prepared for checking of valves which have been in use for some period . . . as nine times out of ten . . . radio set faults are traced to inefficient tubes. Build up your business with a Modern Valve Checking Department. The Calstan DC Tube Checker is a boon to Country Dealers as it is BATTERY OPERATED . . . with work from a 6 VOLT BATTERY . . . the high tension being supplied by means of a VIBRATOR UNIT . . . thus enabling it to be used in a place or time independently of Power Lines. Don’t be misled. The Calstan D222 is positively the only Tube Checker which will test all tubes, both AC and DC Battery types
Slade 1937/38 Catalogue.

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