26A1
The Tektronix 26A1 is an operational amplifier plug-in for the 2600 series. It came with a 013-0113-00 terminal access adapter with feathered contacts to implement the operational amplifier feedback circuit with leaded components without soldering. A blank terminal access adapter designed for custom circuitry was available as well (013-0114-00).
Pictures
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26A1 without Terminal access adapter
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26A1 with terminal access adapter
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wired terminal access adapter