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Hickok 752A Mutual Conductance Tube Tester - Calibrated - Perfect Specs -Manual For Sale


Hickok 752A Mutual Conductance Tube Tester - Calibrated - Perfect Specs -Manual
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Hickok 752A Mutual Conductance Tube Tester - Calibrated - Perfect Specs -Manual:
$775.88


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Hickok 752A Mutual Conductance Tube Tester

This came from the White Sands Missile Range in New Mexico and was fitted with a military style grounded plug that has a movable ground plug prong that can fit in to a 2 pronged outlet if needed.
The 83 and 5Y3GT are both New. The 83 is a Sylvania JAN and the 5Y3GT is NOS made and in Japan. Both were tested and both are balanced.
There are THREE POTs to aid with calibration, r5, to adjust meter for plate voltage, r10 that adjusts the VR voltage, and r20 which adjusts the balance for the 83 tube which have not been adjusted. I did mark where they are just in case.

Some Voltage SPECs can be seen in the pictures below. All tests were done with the correct shunt resistor to duplicate 1,000 Ohms/Volt Meter and Vacuum Tube Volt Meter.

Picture 3 shows the plate voltage at 152: SPEC is 150 +- 5 volts.
Picture 4 is the low plate voltage at 68.3: SPEC is 68 +- 3 volts.
Picture 5 is bias voltage of 39.44 with the control at 100: SPEC is 39/40 +- 1
Picture 6 is bias voltage of 3.117 with control at 22: SPEC is 3.0 +- .2
Picture 7 shows the filament voltage with the 6L6 tube in the socket at 6.24 which there is no SPEC for in any Hickok manuals (with a tube in the socket), but critical to get accurate test results. Many Hickok testers can be calibrated, but the heater voltage drops below 6 volts when a tube is in the socket causing inaccurate test results. All the filament voltages were checked and within SPEC per the min/max filament chart included in the calibration instructions.
Picture 8 is the 6L6 being tested per tube chart setup on x10
The AC signal voltages for each of the seven settings tested on
SH at 2.5, SPEC is 2.40 to 2.55
x1 at 1.25 SPEC is 1.23 to 1.30
x2 at 2.480 SPEC is 2.40 to 2.55
x4 at 1.25 SPEC is 1.23 to 1.30
x10 at .500 SPEC is .48 to .52
x20 at .250 SPEC is .240 to .255
Screen voltages tested at 132.8 SPEC is 130 +- 5 volts
Low screen tested at 56.8 SPEC is 56 +- 3 volts
Bias cut-off voltage tested at 34.2 and SPEC calls for over 30. The bias cut-off is used for the dual tests.
AC Plate voltages tested on the S1 at 18.82 SPEC is 18 to 20 volts.
S3 tested at 37.0 and SPEC is 35 to 38 volts.
S6/Gas tested at 168.3 SPEC is 165 to 175 volts.
S2 tested at 288.8 SPEC is 285 to 300 volts.
Checked the leakage circuit with 500,000 ohm resistor and read 500k on the meter.
Checked the voltage regulator circuit, VR on the multiplier, with 150 volts on the volt meter and read the same on the 752A meter. Checked the S9/ VR MILLS with results of 50 MA on the 752A meter and external meter.

It comes with a DVD that includes Western Electric tube data, calibration instructions, a manual with a full-size one page schematic and obsolete tube data, general tube data, foreign tube data, obsolete tube data, and instruction manual. The tube data roll chart is dated 1971 and includes many of the newer tube such as the 6JE6 sweep tube.
The 752A (A version of the 752) can test the newer tubes that the 752 cannot. No CA-4 or CA-5 adapter is needed.
This 752A tests tubes using the minimum Gm from the tube data which is similar to the 539C and some others.
Please look at the pictures and ask any questions.
The pictures are part of the description so please enlarge them and take a look for better details.

Please ask any questions and look at the pictures for details.
There are several choices for shipping and none include any additional or hidden charges for handling or materials; only what it costs for the shipping period.

Must read and agree to terms below:

Please note and understand that there are no returns on this tester, all sales are final. If you have an issue upon receiving please notify me immediately. This tester is over 40 years old and should last another 50 if used and maintained properly, but if directions are not followed and someone tries to test a shorted tube e.g., any tube tester can be destroyed in a second. I cannot be held responsible for someone\'s error. I do however guarantee you get exactly what is pictured and as described.
You are expected to read the manual and understand what you are reading. You need to familiarize yourself with the tester and how it functions. Please take the time to do this since it could save you a lot of grief such as mistakenly pressing the Gm button when testing a rectifier. It is an easy mistake to make and why you need to be careful when using this type of equipment. If you read the manual and use the manual while using the tester until you become experienced, you should have very few problems if any.
Also, the same tube tested on different and also calibrated testers will usually give different results on each tester. Please do not expect this tester to have the same exact results of a tube tested on another tester. If you expect that this tester will test the exact same Gm of a tube you purchased with reported Gm, then are disappointed and want to return it because it tested a tube higher or lower than you expected, do not buy this tester. You are looking to buy something that does not exist and I do not have the time or money to waste on non-issues and uncontrollable variables.

 

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