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both being replaced in less than a year with the 561A, | both being replaced in less than a year with the 561A, | ||
which offered several performance improvements. | which offered several performance improvements. | ||
Photos needed. | Photos needed. | ||
* [http://w140.com/tek_560.pdf Tektronix 560 Manual (PDF)] | |||
* [http://w140.com/tek_560_561_product_release.pdf Tektronix 560 and 561 Product Release (PDF)] | * [http://w140.com/tek_560_561_product_release.pdf Tektronix 560 and 561 Product Release (PDF)] | ||