Difference between revisions of "1121"

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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 stage is a [[12BY7A]] pentode, V483, biased with 33mA plate current,
+
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,
 
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
 
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
+
R486, 30 Ω, makes the output resistance of the 1121 about 107 Ω. ''(Why is this not 93 Ω?)''
93 Ω?)
 
  
 
The 1121 uses a [[turret attenuators|turret attenuator]] at the input.
 
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==
 
==Specifications==
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<gallery>
 
<gallery>
File:Tek 1121 front.jpg
+
Tek 1121 front.jpg
File:Tek 1121 schematic.png
+
Tek 1121 schematic.png
File:Tek 1121 left internal.jpg
+
Tek 1121 left internal.jpg
File:Tek 1121 right.jpg
+
Tek 1121 right.jpg
File:Tek 1121 top.jpg|Top view
+
Tek 1121 top.jpg|Top view
File:Tek 1121 bottom.jpg|Bottom view
+
Tek 1121 bottom.jpg|Bottom view
File:Tek 1121 turret attenuator.jpg|Turret attenuator
+
Tek 1121 turret attenuator.jpg|Turret attenuator
File:Tek 1121 right external.jpg
+
Tek 1121 right external.jpg
File:Tek 1121 rear.jpg
+
Tek 1121 rear.jpg
 
</gallery>
 
</gallery>
  
 
[[Category:Amplifiers]]
 
[[Category:Amplifiers]]
 
[[Category:Introduced in 1960]]
 
[[Category:Introduced in 1960]]

Latest revision as of 02:48, 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