015-027

The Tektronix 015-027 is the 115 V_AC power supply for the Tektronix 131 Model 4. It has a standard NEMA 5-15 AC power plug built onto the body of the power supply. It has a full wave rectified output which is filtered and Zener regulated to ~20 V_DC.

The Tektronix 015-0?? (please add) is the 230 V_AC power supply for the Tektronix 131 Model 4. It is identical to the 115 V_AC version except for the cover, which has a different part number and voltage rating printed on it, and a metal extension of the body to accommodate the addition of two dropping resistors (18 kΩ, 1 W) in series with the transformer primary. Oddly, this 230 V_AC version appears to use a NEMA 5-15 115 V_AC cord and plug. The addition of the two series resistors allows it to work from 210 to 250 V_AC.

Both versions have a Tektronix proprietary coaxial output connector. The center conductor is grounded and the outer conductor is about 20 volts negative.

Note the added label in the second photo, intended to prevent accidental use with a Type 134. These power supplies did not originally come with any identifying label. Using the wrong supply with the 131 or 134 will short out the power supply, possibly leading to damage of the power supply. Damage to the amplifier is unlikely.

Pictures

• Front, with Tek ID

  Front, with Tek ID

• Back, with added label

  Back, with added label