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|manuals=
|manuals=
* [[Media:070-0379-00.pdf|Tektronix 1A7 Manual]] (OCR)
* [[Media:070-0379-00.pdf|Tektronix 1A7 Manual]] (OCR)
* [[Media:070-0782-00.pdf|Tektronix 1A7A Manual]]
* ''See [[1A7A]] page for 1A7A manuals''
* [[Media:Tek 1a7a product reference book.pdf|Tektronix 1A7A Product Reference Book]]
* [[Media:Tek 1a7a fcp april 1968.pdf|Tektronix 1A7A Factory Calibration Procedure, April 1968]]
}}
}}
Replacing Types '''[[D]]''' and '''[[E]]''', the '''Tektronix Type 1A7''' is a high-sensitivity differential plug-in for [[500-series scopes]].
Replacing Types '''[[D]]''' and '''[[E]]''', the '''Tektronix Type 1A7''' is a high-sensitivity differential plug-in for [[500-series scopes]].
It senses down to 10 μV/Div, either AC or DC-coupled.  It's possible to apply up to ± 300 mV offset to the reading while maintaining sensitivity.
It senses down to 10 μV/Div, either AC or DC-coupled.  It is possible to apply up to ±300 mV offset to the reading while maintaining sensitivity.
Upper and lower cutoff frequency is selectable on the front panel. Maximum bandwidth is 500 kHz, and common-mode rejection is 50,000 to 1.
Upper and lower cutoff frequency is selectable on the front panel. Maximum bandwidth is 500 kHz, and common-mode rejection is 50,000 to 1.


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(Correspondence May 2021)
(Correspondence May 2021)
</blockquote>
====Type 1A7A====
In 1968, the 1A7 was superseded by the FET-equipped '''Type 1A7A''' (designed by [[Thor Hallen]]),
which also doubled the bandwidth (to 1 MHz).
The 1A7A's differential amplifier design was re-used with some modifications
in the [[3A9]], [[3A10]], [[7A22]], [[5A22N]] and [[5030]]/[[5031]] scopes. The [[AM502]] and [[26A2]] use BJTs instead of JFETs for the offset current sources.
Type 1A7A remained available until the end of the [[500-series scopes|500-series]] line.
<blockquote>
[[John Addis]] [[Preamble DA1855|says]]:
The 1A7A (designed by Thor Hallen) and the [[7A22]] (designed by [[Val Garuts]]) used essentially the same circuit. Exactly who came up with the brilliant input circuit is lost to history. The 1A7A came out first, but Thor had worked as evaluation engineer for Val Garuts. Val does not remember who created the circuit, and Thor died in 2002.
</blockquote>
</blockquote>


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{{Spec | Deflection | 10 μV/Div to 10 V/Div in 1–2–5 sequence }}
{{Spec | Deflection | 10 μV/Div to 10 V/Div in 1–2–5 sequence }}
{{Spec | Input impedance | 1 MΩ // 47 pF (either input) }}
{{Spec | Input impedance | 1 MΩ // 47 pF (either input) }}
{{SpecGroup | 1A7}}
{{Spec | Bandwidth | 500 kHz, LF limit switchable DC, 0.1 Hz to 10 kHz in ×10 steps, HF limit switchable 100 Hz to 100 kHz in ×3/×10 steps, and 500 kHz; AC coupling 1.6 Hz }}
{{Spec | Bandwidth | 500 kHz, LF limit switchable DC, 0.1 Hz to 10 kHz in ×10 steps, HF limit switchable 100 Hz to 100 kHz in ×3/×10 steps, and 500 kHz; AC coupling 1.6 Hz }}
{{SpecGroup | 1A7A}}
{{Spec | Bandwidth | 1 MHz, LF limit switchable DC, 0.1 Hz to 10 kHz in ×10 steps, HF limit switchable 100 Hz to 1 MHz in ×3/×10 steps, AC coupling 1.6 Hz }}
{{Spec | Signal ranges | }}
{{Spec | Signal ranges | }}
{| class="wikitable" border=1 style="margin-left: 8em;" |
{| class="wikitable" border=1 style="margin-left: 8em;" |
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==Pictures==
==Pictures==
===1A7===
 
<gallery>
<gallery>
Tek 1a7 front.jpg
Tek 1a7 front.jpg
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Tek 1a7 in 133 2.jpg|1A7 in [[133]]
Tek 1a7 in 133 2.jpg|1A7 in [[133]]
Tek 1a7 in 133 3.jpg|1A7 in [[133]]
Tek 1a7 in 133 3.jpg|1A7 in [[133]]
Tek 1a7 top2.jpg|1A7
Tek 1a7 top2.jpg|
Tek 1a7 right2.jpg|1A7
Tek 1a7 right2.jpg|
Tek 1a7 left2.jpg|1A7
Tek 1a7 left2.jpg|
Tek 1a7 left rear2.jpg|1A7
Tek 1a7 left rear2.jpg|
Tek 1a7 front2.jpg|1A7
Tek 1a7 front2.jpg|
</gallery>
===1A7A===
<gallery>
Tek 1a7a 1.JPG|1A7A
Tek 1a7a bf.jpg|1A7A
Tek 1a7a 2.JPG|1A7A
Tek 1a7a 3.JPG|1A7A
Tek 1a7a 4.JPG|1A7A
Tek 1a7a 5.JPG|1A7A
Tek 1a7a 6.JPG|1A7A
</gallery>
</gallery>


[[Category:Introduced in 1966]]
[[Category:500 series plugins]]
[[Category:500 series plugins]]
[[Category:Differential amplifiers]]
[[Category:Differential amplifiers]]
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