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