In 1971 Tek introduced the 2600 series, a modular system of plugins for signal generation and conditioning. It met with some success in the Biological Sciences. The form factor for the plugins is similar to the TM500 series but they are not interchangeable. Tek did made an adapter that allowed a 2600 plugin to fit into a 7000 scope slot.

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Does anyone have a lead on where I might buy a 26A2 Differential amplifier module for this series? A friend of mine has finally collected all the rest of the plugins and the 2601 mainframe which he intends to preserve for posterity. The only item he is missing to complete the set is the 26A2 Differential Amplifier.

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For more on this almost forgotten Tek product line see pgs. 6-9 in the March 1971 issue of TekScope:

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Thanks in advance for any help finding one. I searched Google and did not find any credible leads for a 26A2 for sale.

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Dennis