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* [http://www.radiomuseum.org/r/tektronix_differential_comparator_unit_7a13.html Tek 7A13 @ radiomuseum.org] | * [http://www.radiomuseum.org/r/tektronix_differential_comparator_unit_7a13.html Tek 7A13 @ radiomuseum.org] | ||
* [http://ik1zyw.blogspot.co.at/2007/09/tektronix-7a13-broken-relays.html Tek 7A13 broken relays @ IK1ZYW Labs] | * [http://ik1zyw.blogspot.co.at/2007/09/tektronix-7a13-broken-relays.html Tek 7A13 broken relays @ IK1ZYW Labs] | ||
* [http://www.pa4tim.nl/?p=5755 Repairing 7A13 relays @ PA4TIM] (how to take relays apart, inside photos) | |||
==Pictures== | ==Pictures== |