7A18

The Tektronix 7A18 is a general-purpose 75 MHz dual-trace vertical plug-in for 7000-series scopes.

Model 7A18N is identical except it omits the readout circuits.

Key Specifications

Input impedance	1 MΩ // 20 pF
Deflection	5 mV/div to 5 V/div in 1–2–5 sequence, 2%
Bandwidth	0 – 75 MHz (DC), 10 Hz – 75 MHz (AC)
Noise	< 300 μV in 5 mV/Div
Features	Mode: CH1 only, CH2 only, Add CH1+CH2, Alternating, Chopped. CH2 can be inverted. Input sockets with contact ring for probe ×10 / identify information No bandwidth limiter switch
Weight	1.4 kg

Prices

Year	1971	1976	1980	1984	1990
Catalog price	$535	$615	$915	$1,250	$1,790
2014 value	$3,140	$2,570	$2,640	$2,860	$3,260

Pictures

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  7A18A Front

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  7A18A left side. The step attenuators can be seen on the left, the amplifier board on the right.

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  7A18A right side. The circuit boards on top carry the readout circuitry.

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  7A18 attenuator opened. One of the attenuation R/C modules has been unplugged to reveal the switch contacts.