Saturday, October 24, 2015

ST70 Resurrection PART 4

ST70 Resurrection PART 4

Here measuments are made of the bias circuit before and after replacing the two 50uf capacitors with higher rated 100uf caps, showing not only more stability but a cleaner DC signal.   Tests are made to the ABCD DC power for the plate voltages but A and B report high due to the missing 7199's to load them down

See Part 4 here.......

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