Shaun Merrigan
Classic Electronic Restoration, Vacuum Tube Audio, Technical History, Photography
Tag: Shaun Merrigan
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This post will documents my recent repair of a Tektronix 284 Pulse Generator. This device was introduced by Tektronix in 1967. It can produce: The Tektronix 284 can be used to check the risetime of oscilloscopes, (both sampling and real time) amplifiers, transistors, transient responses, and for TDR work. The pulses are generated by a…
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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 August 2017 HP 8903B Audio Analyzer PCB Pad Replacement Visual inspection of my recently acquired HP 8903B Audio Analyzer revealed that the polymer pads on the bottom side of the main PCB were seriously deteriorated: Besides making an unsightly mess, this residue may form corrosive products which, over time, could damage the PCB.…
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Originally posted in June of 2021 I recently completed repairing/refreshing and calibrating two Tektronix Type 114 Pulse Generators. This is a solid state pulse generator with variable pulse width (100ns – 10ms) and period (1us to 100mS). It can produce pulses of both polarities (-10v to +10v into 50 ohms). It was introduced in 1965.…
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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…