Download HICKOK B TRANSCONDUCTANCE TUBE TESTER service manual & repair info for electronics experts. Daniel Schoo produced a classic document on calibrating a Hickok B/C tube tester which was published in on AudioXpress. Hickok B/C Mutual Conductance Tube Tester – Checkout and Calibration. Version Use this procedure to test and calibrate the Hickok Model C mutual .

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Accurate Calibration Of The Hickok B And Hickok C Tube Tester

You may find that your meter is less sensitive than the Hickok specifications, i. First, appropriate SS replacements can reduce the heat load in this unventilated set by almost 25 watts. If you decide to do something similar, I would recommend using a more modern op amp and higher supply voltages. See terms – opens in a new window or tab.

So there is the question of how well do values obtained in this way and at these lower operating conditions apply to tubes run at higher power i. Press the P4 button and take a plate current reading at whatever grid bias voltage level is desired and then take a new reading at a slightly different bias voltage, for example at one volt larger or smaller.

Hickok B Tube Tester Instruction Manual & Tube Data | eBay

Using a pen or pencil, make a mark on the band and the outside of the meter so you can get back to the original setting. Actually, it does more than this, it also puts a K resistor R36 in series with the neon bulb and puts a K resistor R35 across the combination.

Special financing available Select PayPal Credit at checkout to have the option to pay over time. You could also change R7 1. My advice is that if it reads close to 1 Mohm with a 1 Mohm resistor, leave it alone. It turns out that the exact value of the Zener diodes makes almost no difference and can be omitted entirely if desired. If C3 were not used, the physical inertia of the meter movement would perform the same function. It is missing the meters, the roll chart, some of the precision resistors etc.


In fact, using a calibration tube to calibrate this set using the Hickok? Remove the scope when done.

Contact the seller – opens in a new window or tab and request a shipping method to your location. The best options are to just use the setting that you already have, if it is close to correct and use this setting consistently for the calibration and when actually using it to check tubesor to carefully mark the actual position of the needle on the face of the meter with Daniel Schoo values were taken empirically from their prototype set and that the shunt potentiometer they used in their prototype was slightly non-linear.

If it becomes loose and the wire from the transformer that is connected to it breaks, that could be very bad news.

When the voltages are negative, no current flows because the DUT mankal as a rectifier, so, in effect, it is only receiving positive voltage hkckok DC. Main Meter Equivalent Circuit. Note that there are always limitations, even in a tester as good as this one.

The point to note is this: Measure the resistance between terminals M and J, and between terminals P and N. This section reflects my opinions on various topics and things that I have seen on the internet that I consider to be noteworthy or, in some cases, egregiously wrong or incorrect.

Accurate Calibration Of The Hickok 539B And Hickok 539C Tube Tester

If it really was necessary to employ very high voltages to adequately evaluate most vacuum tubes, the majority of the tube testers would use or or volts. Use an ohmmeter to measure the resistance setting of the 2K potentiometer and put a fixed resistor of that value in series with the replacement meter.


When the SHORTS switch is in position 1, shorts between the heater and hjckok rest of the tube elements specifically including the cathode are detected by the neon bulb circuit, but even moderate amounts of leakage may not be enough to light the NE 51 bulb. This modification can be used to improve the accuracy of any one range, but will degrade the accuracy on other ranges.

Yet another way of janual the issue is this: See the Controversial Comments SectionHicook.

Although the procedure contains some errors, there is a good discussion on calibration tube selection by Daniel Shoo at the end his V4. This pattern became obvious from the computer simulations. An 18 ohm 2 Maunal resistor worked in my set. In fact, this method could be used to accurately calibrate just about any tester, but it would be a bit cumbersome and inconvenient.

I have been selling on eBay since – buy with confidence! This is because other manufacturers and manuxl other models from the same manufacturer will be testing under different operating conditions different plate and screen voltages, different control grid bias, different ac signal control grid voltage, and probably slightly different filament voltage.

Much of the analysis above has been about the transconductance features of this tester. Second, it depends on what the gas is that is present. Even if it did happen, it is not clear whether the effect would be large enough to be of concern.

When the shunt is large, hockok relative shunt resistance hixkok small changes in the shunt values cause large changes in the total current and therefore in the final result.