Tektronix 2465 Calibrator Broken

[mawyatt]

Hello,

New here and thought about posting a success repair for restoring the Calibration function. I purchased a couple 2465 off eBay, each had their problems. I've replaced many of the usual power supply capacitors (waiting for a few others) as indicated by many others, but the Calibrator waveform is not correct as you can see. I traced this out and after a little circuit analysis thought the cause was a defective zener diode, this is a special Motorola part. I replaced the Zener with a 1N4733A zener and this fixed the Calibrator waveform.

Best,

Mike