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Original Message
Calibrates it's self?
Posted by gusser on February 10, 2017 at 14:02:59:
Against what? How stable is the calibration reference?
Hint, why did Dynaco choose 1.56 volts for the bias setting in their famous amps. That required a non standard cathode resistor. Why 1.56 volts?
It's all about the accuracy of the reference. Otherwise any so called calibration is relative.
Also, you only need to calibrate those old dinosaurs once a year if you are doing work that requires traceable calibration certificates. That doesn't mean they need yearly calibration to remain accurate - and surly accurate enough for hobbyist audio use.