015-0058-01

The Tektronix 015-0058-01 is the power supply for the Tektronix 134 current probe amplifier. It plugs into a standard NEMA 5-15 115 VAC receptacle and provides a full wave rectified nominal 20-25 VDC output to the 134 amplifier. That output is regulated down to ~14 V in the amplifier. It works from 50 to 400 Hz and 103.5 to 126.5 VAC.

Tektronix also made a 230 VAC version of this power supply, the 015-0059-01. This was identical to the 115 VAC version except for the cover, which had the different part number and voltage rating printed on it, and the addition of two series dropping resistors (2 kΩ & 2.7 kΩ, both 3 W) ahead of the transformer primary. Oddly, this 230 VAC version appears to have used the same NEMA 5-15 plug. The addition of the two series resistors allow it to work from 207 to 253 VAC and 50 to 400 Hz.

All the manuals show a cord and plug for input AC power. Note that some of the photos below show a version with the AC power connector integral to the body. This particular example was built up for me from parts, by Deane Kidd. This may not have been a Tektronix standard at any time.

The DC output connector is a Tektronix design that was unusually fragile. This complete power supply could probably be rather easily replaced by any common "wall wort" with an output of 18-25 VDC. If you're tempted to do this, I recommend replacing the cord on the 134 with a modern receptacle that accepts the existing connector on the end of the "wall wort" connector. This would eliminate the original, but fragile, Tektronix connector.

If you happen to have one of these power supplies apart, it might be worthwhile adding 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 VAC (or 230.)