7A12

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Tektronix 7A12
120 MHz dual-channel amplifier
7A12 front view

Compatible with 7000-series scopes

Produced from 1969 to 1974

Manuals


Manuals – Specifications – Links – Pictures

The Tektronix 7A12 is a 120 MHz dual-trace vertical plug-in for 7000-series scopes. This original 7000-series plugin allows to compensate large dc offset voltages, however the offset voltage is not available on the front panel to be measured externally as with the 7A11.

Switches on the front panel control miniature relays in the signal path, such as those selecting input attenuators, through logic circuits. It uses the 155-0032-00 as a gain stage and the 155-0022-00 for channel switching.

The 7A12 was designed by Roy Hayes (who also designed the 3A3 and 3A8 before leaving for HP Loveland in Jan 1971). The Evaluation Engineer for the 7A12 was Peter Starič, co-author of the book "Wideband Amplifiers" with Erik Margan.

Key Specifications

Bandwidth 120 MHz (79xx) / 105 MHz (77xx) / 55 MHz (74xx)
Deflection 5 mV/Div to 5 V/Div (1–2–5), variable up to 12.5 V/Div
Input impedance 1 MΩ // 24 pF
Timing Delay difference between channels < 500 ps
Channel isolation At least 3000:1 at 75 MHz
Maximum input 350 V DC + Peak AC at 1 kHz or less
DC offset At least ±500 divisions

Links

Pictures

Custom ICs used in the 7A12

Page Class Manufacturer Model Part nos Description Designers Used in
155-0022-00 Monolithic integrated circuit Tektronix M036 155-0022-00 155-0022-01 analog multiplexer Gene Andrews 147 148 149 335 468 1430 1441 1461 1900 1910 2220 2221 2230 5223 5403 5440 5441 5443 5444 5A38 7313 7403 7503 7504 7514 7603 AN/USM-281C 7613 7623 7623A 7633 7704 R7704 7704A 7834 7844 7854 R7912 7912AD 7912HB 7904 R7903 7904A 7934 7A12 7A18 7A18A 7B52 7B53N 7D10 7D11 7D12 NT-7000 P7001
155-0032-00 Monolithic integrated circuit Tektronix M55 155-0032-00 155-0032-01 variable-gain transconductance amplifier Roy Hayes Einar Traa 335 464 465 465B 466 475 475A 475M 634 650 651 652 653 655 656 670 671 7A12 475 FG504 1440 1460 1480 1481 1482 1485