Phonometer 7927

Portable tube tester for comparing two tubes of the same type. In metal box with lid and a brown leather strap. With this instrument, a tube vendor could convince a consumer that a new tube sounds better than an old, worn-out tube.

The tester is equipped with an adapter that could be inserted into a tube base in the radio of a customer. In the tester, a new tube and the old tube from the customer's receiver were placed side by side. By switching a lever, the quality difference between the old and the new tube could be proved in an audible manner. In the tester, tubes with a B-base and a P-base can be tested.

The test does have some restrictions. Testing HF converter and other preamplifier tubes works less well because of capacity differences. The Phonometer was specially designed for power tubes and rectifiers.

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