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1121: Difference between revisions
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The Tektronix 1121 is a 5Hz to 17MHz amplifier with gain of 100. The maximum output | The Tektronix 1121 is a 5Hz to 17MHz amplifier with gain of 100. The maximum output | ||
is 2Vpp into a 93-ohm load. The 1121 is AC coupled at the input, but DC coupled at | is 2Vpp into a 93-ohm load. The 1121 is AC coupled at the input, but DC coupled at | ||
the output. The output stage is a [[12BY7A]] pentode biased with 33mA plate current. | the output. The output stage is a [[12BY7A]] pentode, V483, biased with 33mA plate current, | ||
which gives a transconductance of about 13mS. Assuming the tube operates unilaterally, | |||
this gives an impedance of about 77 ohms at the cathode of V483. Series output resistor | |||
R486, 30 ohms, makes the output resistance of the 1121 about 107 ohms. | |||
* [http://bama.edebris.com/download/tek/1121/Tek%201121.pdf Tektronix 1121 Manual (PDF)] | * [http://bama.edebris.com/download/tek/1121/Tek%201121.pdf Tektronix 1121 Manual (PDF)] | ||