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The second stage is a differential amplifier made of both halves of a [[6BQ7A]]. | The second stage is a differential amplifier made of both halves of a [[6BQ7A]]. | ||
* [http://w140.com/mmm/tek-570.pdf Tektronix 570 Manual (PDF)] | * [http://w140.com/tek_570_manual_070-359_7-63.pdf Tektronix 570 Manual (good quality, PDF)] | ||
* [http://w140.com/mmm/tek-570.pdf Tektronix 570 Manual (mediocre quality, PDF)] | |||
* [http://w140.com/tek_fcp/tek_570_fac_cal.pdf Tektronix 570 Factory Calibration Procedure (PDF)] | * [http://w140.com/tek_fcp/tek_570_fac_cal.pdf Tektronix 570 Factory Calibration Procedure (PDF)] | ||