Shaun Merrigan
Classic Electronic Restoration, Vacuum Tube Audio, Technical History, Photography
Category: Restoration of Vacuum Tube Test Equipment
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Originally posted in March 2022 I recently completed the construction of a PC controlled vacuum tester: The Roetest. This is a computer-controlled tube tester which works as follows: Construction Details: Using the PC software, load the data for the TUT (Tube under Test). Pinout and base connection information is taken from an extensive database of…
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Originally posted in June, 2021 Introduced in 1966, the Tektronix 106 Square Wave Generator is a signal generator which can produce fast rise (<1nS @50 ohm loads positive or negative going) or high amplitude (120 Volts, high impedance load) square waves from 10Hz to 1MHz. It is used for oscilloscope calibration, risetime testing and for…
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Originally posted in December, 2018 This post documents my restoration of the Hickok 209A VTVM, SN 1333254. Outside visual inspection results: Inside visual inspection results: From the above images, it is clear that the battery holder will require some corrosion mitigation and restoration. Fortunately, it is restorable as the parts are of heavy gauge (including…
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Originally posted in December, 2018 This post continues my restoration of the Hickok 209A VTVM, SN 1333254, Part 1 Recall that the D-cell battery holder was badly corroded. Here is process I used to restore the battery holder: Once all the corrosion product was removed and neutralized I decided to prime and paint the battery…
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Originally posted in December, 2018 This post continues my restoration of the Hickok 209A VTVM, SN 1333254, Part 2 Hickok 209A VTVM Restoration Part 6: Component replacement decisions In this Part 6 of the series I will document the condition of the passive circuit components in the Hickok 209A VTVM, and justify why I decided…