Hickok 533A Tube Tester
The Hickok model 533A tube tester is one of their most popular models. As with most
all of Hickok tube testers, this unit uses the mutual transconductance method for testing
of tube quality.
There is also an earlier model 533 which is similar but has
different grid signal levels and different switch settings. Unfortunately,
you can't use 533A settings with the earlier 533
Here a few of the 533A's key features:
- Has 4,5,6 and 7 pin large sockets, 7 and 9 pin minature, octal, locktol, and acorn
sockets. Ideal for testing older antique type tubes such as 01A, 45, 50, 2A3,80,
6L6, 6CA7, etc. Compactron type tubes can be tested with model CA5 adaptor (not
available).
- Read transconductance directly in micromhos or read Good-?-Bad Scale.
- Sensitive shorts tests lights neon bulb when there is either a direct short
between elements or high resistance leakage.
- Noise test is useful for detecting microphonic tubes.
- Gas test is used to determine if any stray gas molecules are present inside the
tube. This is especially helpful when checking amplifier tubes. Gassy tubes cause problems
with bias adjustments.
- Built in roll chart has settings for most popular tubes
- Obsolete Tube and Foreign Tube Roll Chart Supplement books are
included with this tester.
- Unit is in good operating and cosmetic condition
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