Re: Timebase and CRT Issues on Tektronix Type 545A

Albert Otten

Alex, for the A time base you can check the Sawtooth Output at the front panel. That signal is picked off in an earlier stage, before the (switches to the) horizontal amplifier. This could distinguish a saw tooth problem from a horizontal amplifier problem. For the B time base this would require internal measurements; not difficult but you have to know at which points a measurement would not disturb circuit operation ("low ohmic" points).
Of course dead tubes can/will disturb proper circuit operation. But so can an intermittent slider of an adjustment pot. It makes no sense to check tubes in the wild, without the tube being suspect already.


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