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In Reply to: RE: Eico HF 30 rebuild, hums badly... posted by gkargreen on December 23, 2015 at 08:39:16
You did check the wiring on the heaters of the output tubes? So that AC from heater line is cancelled by push-pull effect.
8^)
Follow Ups:
Hi, Fender, I just rechecked the filament wiring, it is wired to the schematic which was also how the original owner wired it, i.e., all pin 4 wired to the same wire and all the pin 5 wired together with pins 3 of the 6AV6 and 6C4 wired to pins 4 of the output tubes and pin 4 wired to pin 5 of the output tubes, just like the schematic. I just moved the ground of the power supply caps to a separate ground rather than the star ground, no difference except now the in-rush current is now about 4 amps rather than 1.5 amps from before, this damn amp gets more confusing every time I do something to it, thanks
Just a swag.. did you replace the original 2 prong AC cord with a 3 prong and attach the safety ground wire to the chassis?
The bitterness of poor quality remains long after the sweetness of low price is forgotten
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