121

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Tektronix 121
Wideband preamplifier
Tek 121 front

Produced from 1950 to (?)

Manuals
Manuals – Specifications – Links – Pictures

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

Specifications

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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 Tek 121 front.jpg Tek 112 front crop.jpg

Picturess