1121
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.
Key Specifications
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Pictures
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Top view
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Bottom view
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Turret attenuator
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Components
Some Parts Used in the 1121
| Part | Part Number(s) | Class | Description | Used in |
|---|---|---|---|---|
| 6DJ8 | 154-0187-00 • 154-0305-00 | Vacuum Tube (Dual Triode) | dual triode | 111 • 132 • 161 • 310A • 316 • 317 • 502 • 502A • 503 • 504 • 506 • 515 • 516 • 519 • 526 • 529 • RM529 • 533 • 535 • 536 • 543 • 544 • 545 • 545A • 545B • 546 • 547 • 549 • 555 • 556 • 561A • 561S • 564 • 565 • 567 • 581 • 581A • 585 • 585A • 661 • 1A4 • 1S1 • 60 • 2A60 • 63 • 2A63 • 67 • 2B67 • 3A1 • 3A1S • 3A2 • 3A3 • 3A6 • 3A7 • 72 • 3A72 • 75 • 3A75 • 4S2 • 51 • 3B1 • 3B1S • 3B2 • 3B3 • 3B4 • 3M1 • 3S76 • 3T77 • 3T77A • 9A1 • 9A2 • 1121 • 80 • 81 • 82 • 86 • B • O • W • Z • Telequipment D56 • Telequipment S32A • Telequipment D52 • S-311 • Telequipment TD51 • Telequipment S52 • Telequipment S51 • Telequipment Type A • TU-4 |