155-0038-01
The "Tektronix 155-0038-01' is a Tek-made 5-bit current source D/A converter chip in a 16-pin DIP. Two may be cascaded for a 10-bit DAC with 1/2 LSB accuracy.
Data Sheet
Used in
The 155-0038-01 is used in several 7000 series plugins to drive the mainframe's readout current inputs, which it can do directly when powered from -15V: