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This was originally posted in December, 2017 Tektronix 556 Dual Beam Oscilloscope Testing: Vertical Bandwidth I have been doing some basic testing of my Tektronix 556 Dual Beam Oscilloscope, and I have documented some parts of this process. I have also captured images of the traces, which I will share here. Test Setup: Tektronix 556,…
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Originally posted in January, 2017 I was recently fortunate enough to acquire a Tektronix 556 Dual Beam Oscilloscope with many accessories and in good condition. Unfortunately, the cooling fan on the scope was very loud and more concerning, it emitted an alarming metal on metal contact sound. After verifying basic operation of the oscilloscope, I decided…
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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.…
Shaun Merrigan
Classic Electronic Restoration, Vacuum Tube Audio, Technical History, Photography