Here is a very nice Hickok 752A Tube Tester.
For those of you who know this wonderful tester, nothing more need
be said except that it is in good working order. For those of
you who aren't familiar, you will find more information about it
below. This tester is especially nice for audio hobbyists
because it checks double element tubes like 12AX7, etc. without
having to reset the switches like you do with most tube testers
including most Hickoks. Another unusual feature of the 752A is
that it has BOTH the early 4, 5, 6, & 7 pin sockets as well as the
later compactron and nuvistor sockets.
This one is very nice cosmetically
except there is some surface rust on some of the outside corner braces.
The exterior of the case is about an 8 out of 10 and so is the interior
faceplate. Those of you who have seen your share of Hickok testers
as I have know that more often than not the leatherette paper on the
outside of the case is falling off and sometimes missing altogether.
This one is not that way. It's really pretty nice.
This tester has NOT been serviced, but
it seems to work very well. I checked it against several of my
calibrated tube standards and the tester appears to be right on as far as
calibration is concerned. The tester also correctly identifies weak
and good rectifiers. You shouldn't have to do anything to it.
As usual with most Hickok testers, the roll chart works kind of hard, but
it does work. The tester comes with a roll chart in book form,
so that really doesn't matter much. Also, one minor problem I have
identified is that the meter tends to stick a little at the bottom.
It does not seem to effect the readings on the tester. Usually this
is a static problem as the meter face is plastic.
This tester will come with ALL books
Instruction Manual with Schematic
Roll Chart in Book Form
Foreign Roll Chart Supplement
Obsolete Roll Chart Supplement
Checks mutual transconductance for tube quality test which is the
most reliable test known.
Meter has only one scale which makes it easier to read than most other
Hickok testers. A mutliplier switch is set rather than using several meter scales.
Handy "Plate 2" button allows for testing double section tubes
without resetting selector switches.
Meter and roll chart are backlit....another feature not found on most
Hickok checkers. This feature really makes the tester a joy to use in darker rooms.
#49 light bulb acts as a bias fuse to protect the sensitive bias
2 plate voltages available.
Life Test button
Terminals for attaching external self bias resistor.
Shorts and leakage are indicated on the meter rather than a less
reliable neon bulb.
Sensitive gas test
Model 752 has 4-5-6-7 pin, octal, loctal, 7 & 9 pin minature, acorn,
and subminature sockets. The Model 752A has all of these sockets with the addition
of 9 pin and 12 pin compactron, 10 pin decal, and both types of nuvistor sockets
Comes with instruction manual, obsolete and foreign tube roll chart