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133: Difference between revisions
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The bandwidth of the 133's outputs is 100 kHz, which is much slower than the 16 MHz bandwidth of the [[132]]. | 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]]. | 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. | |||
==Manuals== | ==Manuals== | ||
* [ | * [https://w140.com/tek_133_ocr.pdf Tektronix 133 Manual (PDF)] | ||
* [ | * [https://w140.com/tek_133_1968_catalog.pdf Tektronix 133 in 1968 Catalog (PDF)] | ||
==Pictures== | ==Pictures== | ||