1121

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Tektronix 1121
5 Hz − 17 MHz amplifier
Tektronix 1121 Amplifier

Produced from 1960 to (?)

Manuals
Manuals – Specifications – Links – Pictures

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

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Pictures


Some Parts used in the 1121

Page Class Description Used in
6DJ8 Vacuum Tube (Double Triode) dual triode 132 502 502A 503 504 515 516 519 533 535 543 544 545 545A 545B 546 547 549 555 556 565 581 581A 585 585A 661 2A60 2A63 3A8 1121 1A4 67 81 82 86 3B1 3B4 O Telequipment S32A Telequipment D52 Telequipment S52 Telequipment S51 Telequipment Type A