1121: Difference between revisions

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The Tektronix 1121 is a 5Hz to 17MHz amplifier with gain of 100.  The maximum output
[[Image:Tek 1121 front.jpg|thumb|350px|right|Tektronix 1121 Amplifier]]
is 2Vpp into a 93-ohm load.  The 1121 is AC coupled at the input, but DC coupled at
The '''Tektronix 1121''' is a 5 Hz to 17 MHz amplifier with gain of 100 [[introduced in 1960]].   
the output.  The output stage is a [[12BY7A]] pentode, V483, biased with 33mA plate current,
It can be considered a replacement for the [[121]].   
which gives a transconductance of about 13mS.  Assuming the tube operates unilaterally,
this gives an impedance of about 77 ohms at the cathode of V483Series output resistor
R486, 30 ohms, makes the output resistance of the 1121 about 107 ohms.


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 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 attenuators|turret attenuator]] at the input.
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.
==Specifications==
[[Category:Specifications needed]]''please add''
==Manuals==
* [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)]
* [http://w140.com/tek_fcp/tek_1121_tent_fac_cal.pdf Tektronix 1121 Tentative Factory Calibration Procedure (PDF)]
==Pictures==
<gallery>
Tek 1121 front.jpg
Tek 1121 schematic.png
Tek 1121 left internal.jpg
Tek 1121 right.jpg
Tek 1121 top.jpg|Top view
Tek 1121 bottom.jpg|Bottom view
Tek 1121 turret attenuator.jpg|Turret attenuator
Tek 1121 right external.jpg
Tek 1121 rear.jpg
</gallery>
[[Category:Amplifiers]]
[[Category:Introduced in 1960]]

Revision as of 03:48, 16 October 2019

Tektronix 1121 Amplifier

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.

Specifications

please add

Manuals

Pictures