121: Difference between revisions

Latest revision as of 12:02, 21 September 2023

The Tektronix 121 is a wideband preamplifier intended for 511 scopes. The 1121 can be considered the successor to the 121.

Tektronix 121
Wideband preamplifier Tek 121 front Produced from 1950 to (?) Manuals Tektronix 121 Manual Tektronix 121 Factory Calibration Procedure (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

Key Specifications

please add

Its voltage gain is 100, input impedance is 1 MΩ in parallel with 25 pF, frequency response is 5 Hz to 12 MHz.

Internals

The 121 has an unbalanced signal path with switchable compensated attenuators before and after the first gain stage, a 6CB6 common-cathode amplifier.

Comparison of 121 and 112

The 121 and 112 are both standalone amplifiers produced by Tektronix in the 1950s. A comparison shows their differences.

	121	112
Bandwidth	5 Hz to 12 MHz	DC to 2 MHz
Voltage Gain	100	5000
Year of Introduction	1950	1950
Weight	18 lbs (8 kg)	32 lbs (15 kg)
Price in 1950 catalog	$265	$495
Front View

Picturess

Block diagram

@@ Line 1: / Line 1: @@
-The '''Tektronix 121''' is a wideband preamplifier intended for [[511]] scopes.
+{{Instrument Sidebar
-The voltage gain is 100, input impedance is 1 MΩ in parallel with 25 pF.
+|manufacturer=Tektronix
-The frequency response is 5 Hz to 12 MHz.  It has an unbalanced signal path with switchable compensated attenuators before and after the first gain stage, a [[6CB6]] common-cathode amplifier.  The [[1121]] can be considered the successor to the 121.
+|model=121
+|class=Amplifier
+|series=
+|summary=Wideband preamplifier
+|image=Tek 121 front.jpg
+|caption=Tek 121 front
+|introduced=1950
+|discontinued=(?)
+|designers=
+|manuals=
+* [[Media:IM-121.pdf|Tektronix 121 Manual]]
+* [[Media:Tek_type_121_factory_cal_proc.pdf|Tektronix 121 Factory Calibration Procedure]]
+}}
+The '''Tektronix 121''' is a wideband preamplifier intended for [[511]] scopes.  The [[1121]] can be considered the successor to the 121.
+{{MissingSpecs}}
+Its voltage gain is 100, input impedance is 1 MΩ in parallel with 25 pF, frequency response is 5 Hz to 12 MHz.
+==Internals==
+The 121 has an unbalanced signal path with switchable compensated attenuators before and after the first gain stage, a [[6CB6]] common-cathode amplifier.
 ==Comparison of 121 and 112==
@@ Line 7: / Line 26: @@
 A comparison shows their differences.
-{| border="1" style="text-align: center;"
+:{|class="wikitable" border="1" style="text-align: center;"
 ! scope="col" |
 ! scope="col" | 121
@@ Line 31: / Line 50: @@
 | $265
 | $495
+|-
+! scope="row" | Front View
+| style="vertical-align:bottom;" | [[File:Tek_121_front.jpg|100px]]
+| [[File:Tek_112_front_crop.jpg|100px]]
 |-
 |}
-==Manuals==
+==Picturess==
-* [http://w140.com/tek_121_complete.pdf Tektronix 121 Manual (PDF)]
-* [http://w140.com/tek_fcp/tek_type_121_factory_cal_proc.pdf Tektronix 121 Factory Calibration Procedure (PDF)]
 <gallery>
-Image:Tek 121 front.jpg
+Tek 121 front.jpg
-Image:Tek 121 bottom.jpg
+Tek 121 bottom.jpg
-Image:Tek 121 left.jpg
+Tek 121 left.jpg
-Image:Tek 121 right.jpg
+Tek 121 right.jpg
-Image:Tek 121 top.jpg
+Tek 121 top.jpg
-Image:Tek-121-block.png|Block diagram
+Tek-121-block.png|Block diagram
 </gallery>
-[[Category:Introduced in 1950]]
 [[Category:Amplifiers]]