Olde 'Scope:

Many years ago I was given an old Telequipment DM63 - a dual-beam storage scope. These 'scopes have two vertical plug-ins and my one came with two V4's which are dual-trace units, so in total the 'scope supports up to 4 traces.

Unfortunately, there was a major fault - which is why it was thrown away. The scope basically worked, but you couldn't trigger on any signals due to the failure of IC1 in the timebase module.

This is bad, because IC1 is a custom-made Tektronix chip that is no longer available. There was no option but to build additional circuitry to replace the functionality of IC1.

• Main repair: Details of the initial fix.
• Other Faults: Everything else that went wrong.
• 'Scope 2: Thanks to this page, I've now got a second DM63.