015-0058-01/Repairs
The DC output connector is a Tektronix design that is unusually fragile. This complete power supply could probably be rather easily replaced by any common "wall wart" with an output of 18-25 VDC. The total current draw is less than 100 mA. If you do this, it would be best to replace the cord on the 134 with a modern barrel receptacle that accepts the existing connector on the end of the "wall wart" connector. This would eliminate the original, but fragile, Tektronix connector. You could also add a reverse polarity protection diode inside the 134.
Unfortunately, there is no room inside the [[134] for a modern barrel connector receptacle, but inline barrel receptacles exist.
If you happen to have one of these power supplies apart, it might be worthwhile to add some series resistance to the primary, as Tektronix did to make their 230 V version. Add ~40 Ω for each volt that your typical line voltage exceeds 115 (or 230) VAC. This would help avoid transformer core saturation due to today's higher line voltage, and also reduce the power dissipation in the 134 pass transistor.