1121: Difference between revisions
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{{Instrument Sidebar | |||
The '''Tektronix 1121''' is a 5 Hz to 17 MHz amplifier with gain of 100 [[introduced in 1960]]. | |manufacturer=Tektronix | ||
It can be considered a replacement for the [[121]]. | |model=1121 | ||
|class=Amplifier | |||
|series= | |||
|summary=a 5 Hz to 17 MHz amplifier | |||
|image=Tek 1121 front.jpg | |||
|caption=Tektronix 1121 Amplifier | |||
|introduced=1960 | |||
|discontinued=(?) | |||
|designers= | |||
|manuals= | |||
* [http://bama.edebris.com/download/tek/1121/Tek%201121.pdf Tektronix 1121 Manual (PDF)] | |||
* [http://w140.com/tek_fcp/tek_1121_tent_fac_cal.pdf Tektronix 1121 Tentative Factory Calibration Procedure (PDF)] | |||
}} | |||
The '''Tektronix 1121''' is a 5 Hz to 17 MHz amplifier with gain of 100 [[introduced in 1960]]. It can be considered a replacement for the [[121]]. | |||
Maximum output is 2 V<sub>p-p</sub> into a 93 Ω load. The 1121 is AC coupled at the input, but DC coupled at | Maximum output is 2 V<sub>p-p</sub> into a 93 Ω load. The 1121 is AC coupled at the input, but DC coupled at the output. | ||
the output. The output stage is a [[12BY7A]] pentode, V483, biased with 33 mA plate current, | The output stage is a [[12BY7A]] pentode, V483, biased with 33 mA plate current, which gives a transconductance of about 13 mS. | ||
which gives a transconductance of about 13 mS. Assuming the tube operates unilaterally, | Assuming the tube operates unilaterally, this gives an impedance of about 77 Ω at the cathode of V483. | ||
this gives an impedance of about 77 Ω at the cathode of V483. Series output resistor | Series output resistor R486, 30 Ω, makes the output resistance of the 1121 about 107 Ω. ''(Why is this not 93 Ω?)'' | ||
R486, 30 Ω, makes the output resistance of the 1121 about 107 Ω. ''(Why is this not 93 Ω?)'' | |||
The 1121 uses a [[turret attenuators|turret attenuator]] at the input. | The 1121 uses a [[turret attenuators|turret attenuator]] at the input. | ||
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The front panel probe power connector provides 6.3 V<sub>DC</sub> @ 0.2 A for the heater and +120 V @ 10 mA (regulated) for Type [[P500CF]] cathode-follower probes. | The front panel probe power connector provides 6.3 V<sub>DC</sub> @ 0.2 A for the heater and +120 V @ 10 mA (regulated) for Type [[P500CF]] cathode-follower probes. | ||
{{MisisngSpecs}} | |||
==Pictures== | ==Pictures== | ||
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[[Category:Amplifiers]] | [[Category:Amplifiers]] | ||
Revision as of 06:42, 18 August 2021
The Tektronix 1121 is a 5 Hz to 17 MHz amplifier with gain of 100 introduced in 1960. It can be considered a replacement for the 121.
Maximum output is 2 Vp-p into a 93 Ω load. The 1121 is AC coupled at the input, but DC coupled at the output. The output stage is a 12BY7A pentode, V483, biased with 33 mA plate current, which gives a transconductance of about 13 mS. Assuming the tube operates unilaterally, this gives an impedance of about 77 Ω at the cathode of V483. Series output resistor R486, 30 Ω, makes the output resistance of the 1121 about 107 Ω. (Why is this not 93 Ω?)
The 1121 uses a turret attenuator at the input.
The front panel probe power connector provides 6.3 VDC @ 0.2 A for the heater and +120 V @ 10 mA (regulated) for Type P500CF cathode-follower probes.
Pictures
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Top view
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Bottom view
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Turret attenuator
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