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Repairing the card reader for a 1960s mainframe: cams, relays and a clutch
Ken Shirriff writes: I recently helped repair the card reader for the Computer History Museum’s vintage IBM 1401 mainframe. In the process, I learned a lot about the archaic but interesting...
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Capacitor plague? Inside an HP 8620C sweep oscillator and HP 86245A RF plugin
A teardown of the HP 8620C and HP 86245A by Kerry Wong: I just picked up an HP 8620C sweep oscillator with an HP 86245A 5.9 GHz to 12.4 GHz RF plugin on eBay. This time around though, the unit does...
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HP 8620C sweep generator repaired
Kerry Wong did a repair of an HP 8620C sweep generator we covered previously: In my previous post, I did a teardown of an HP 8620C sweep generator along with an HP 86245A 5.9 GHz to 12.4 GHz RF...
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Teardown and repair of an GW Instek PSW80-40.5 1080W multi-range programmable...
Teardown and repair of an GW Instek 1080W power supply from The Signal Path: In this episode Shahriar investigates the failure of a GW Instek 1080W power supply capable of providing up to 80V and 40A...
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Tandy 1000 upgrades / PS2-Tandy keyboard adapter
Vintage computer Tandy 1000 upgrade @ smbaker.com: A Tandy 1000 was the second computer that I owned, the first was a Tandy CoCo. Note that I keep a slightly different mental “computers that I owned”...
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