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-The Tektronix 1A5 is a differential amplifier plug-in for 500-series scopes.  The maximum differential sensitivity is 1mV/div.  Like most Tektronix differential plug-ins, it has three modes: Va-Vc, Va-Vb, and Vc-Vb.  The 1A5 was [[introduced in 1967]].
+{{Plugin Sidebar
+|manufacturer=Tektronix
+|type=1A5
+|summary=50 MHz Differential Amplifier
+|image=Tek 1a5 front2.jpeg
+|caption=Tektronix 1A5 Differential Amplifier
+|series=500-series scopes
+|introduced=1967
+|discontinued=1975
+|designers=Bill DeVey
+|manuals=
+* [[Media:070-0638-00.pdf|Tektronix 1A5 Manual]] (OCR)
+* [[Media:Tek Type 1A5 FCP 1969.pdf|Tektronix Type 1A5 Factory Calibration Procedure, March 1969]] (OCR)
+* [[Media:Tek 1a5 fcp sep 1967.pdf‎|Tektronix 1A5 Factory Calibration Procedure, September 1967]]
+* [[Media:Tek 1a5 cal outline.pdf|Tektronix 1A5 Calibration Outline]] (OCR)
+}}
+The '''Tektronix Type 1A5''' is a differential amplifier plug-in for [[500-series scopes]].
+It was designed by [[Bill DeVey]] after consultation with [[John Kobbe]].
+It has an [[Amphenol 165 series connector]] on the front panel for direct connection of the Type [[P6046|P6046 Active Differential Probe]].
+Type 1A5 was [[introduced in 1967]], replacing Types [[W]] and [[Z]], and lasted until the end of the 500-series scope line.
+{{BeginSpecs}}
+{{Spec | Bandwidth             | 50 MHz down to 5 mV/div, 40 MHz at 1 mV/div }}
+{{Spec | Deflection            | 1 mV/div to 20 V/div, 1−2−5 }}
+{{Spec | Common-mode rejection | 20,000:1 from DC to 100 kHz, 10,000:1 up to 1 MHz, 200:1 at 20 MHz }}
+{{EndSpecs}}
+Like most Tektronix differential plug-ins, the 1A5 has three modes:
+V<sub>A</sub>−V<sub>C</sub>, V<sub>A</sub>−V<sub>B</sub>, and V<sub>C</sub>−V<sub>B</sub>.
+V<sub>C</sub> is controlled by a ten-turn potentiometer and can vary from −5 V to +5 V (0.5 V on the 5 V/div to 20 V/div ranges).
+==Internals==
+The 1A5 is solid-state except for a pair of [[7586|7586 nuvistors]] used in the upper half of a cascode in the second amplifier stage.
+The attenuator switching is mechanically complex.  A gear mechanism drives the input attenuator switch (under the internal cover) selecting attenuators ×1000 (20 V/div to 5 V/div), ×100 (2 V/div to 500 mV/div), ×10 (200 mv/div to 50 mV/Div) or no attenuators (20 mV/Div to 1 mV/div).
+Additionally, in the 500 mV/div and 50 mV/div positions, the operator can pull the V/Div knob outward when switching to one of the next two more sensitive ranges, in which case the higher attenuator (and higher input and comparison voltage range) remains in place.
+==Pictures==
 <gallery>
-Image:1a5 front.jpg
+Tek 1a5 front2.jpeg ‎
-Image:1a5 right2.jpg
-Image:1a5 right.jpg
-Image:1a5 left.jpg
 </gallery>
+'''Interior'''
+<gallery>
+Tek 1A5 left wo cover.jpg | Left side (attenuator cover removed)
+A5 output board.jpg      | Output board (left side) with HF Comp. daughterboard removed to show reed relays
+Tek 1A5 right.jpg         | Right side
+Tek 1a5 left2.jpeg ‎       | Left side (attenuator cover in place)
+Tek 1a5 right2.jpeg ‎      | Right side
+Tek 1a5 top2.jpeg         | Top
+a5 right.jpg             | Top
+Tek 1a5 bottom2.jpeg ‎     | Bottom
+Tek 1a5 rear2.jpeg ‎       | Rear
+</gallery>
+'''Switches detail'''
+<gallery>
+Tek 1A5 switches 1.jpg
+Tek 1A5 switches 2.jpg
+Tek 1A5 switches 3.jpg
+Tek 1A5 switches 4.jpg
+Tek 1A5 switches 5.jpg
+</gallery>
+==Components==
+{{Parts|1A5}}
+[[Category:500 series plugins]]
+[[Category:Differential amplifiers]]