133

From TekWiki
Jump to navigation Jump to search
Tektronix 133
Module power supply
Tek 133 front view

Produced from 1961 to (?)

Manuals
(All files in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix 133 is an external enclosure and power supply for a letter-series or 1-series plug-in. It was introduced in 1961. The enclosure supplies power to the plug-in and the outputs from the plug-in are available. The bandwidth of the 133's outputs is 100 kHz, which is much slower than the 16 MHz bandwidth of the 132. However, the 133 has a 2 Ω output impedance compared to 5 kΩ for the 132, and the 133 can drive 1.5 amperes at its output, versus a maximum of 10 mA for the 132.

The signal path in the 133 starts with a differential pair of 2N398A PNP transistors (Q414 and Q424) amplifying the signal from the plug-in interface. The differential output of this first stage is used as two single-ended signals. One phase of the differential amplifier's output is sent to the MONITOR output connector. The other phase of the differential amplifier's output is sent to the high-current output amplifier. NORM/INV switch selects which output gets the inverting phase, and which gets the non-inverting phase.

The high-current output amplifier starts with a 2N1225 PNP (Q444) which functions as a feedback amplifier. The collector of Q444 drives the top and bottom halves of the push-pull output stage. The top side of the output stage is a Sziklai pair formed by a TI483 NPN (Q454) driving a 2N1905 PNP (Q474). The bottom side of the output stage is a TI483 NPN (Q463) driving a 2N1905 PNP (Q483). The output has a two ohm resistor and two ferrite beads in series.

Pictures