What is the best approach to wiring the heaters on my amp? I have two 2A 6.3V outputs on the transformer and need to feed an ECC83 shared between the channels and two EL84 - one per channel.
I'm thinking one EL84 per output and then 12.6V centre tapped to the ECC83 with each side fed by the same output as its output tube.
Alternatively is it better to have both EL84 fed by one output and the ECC83 on the other?
I'm thinking one EL84 per output and then 12.6V centre tapped to the ECC83 with each side fed by the same output as its output tube.
Alternatively is it better to have both EL84 fed by one output and the ECC83 on the other?
I'd connect both windings in parallel then run everything at 6.3 volts. Be sure you have the 2 windings in phase or you'll have 12.6v into a dead short.
S.
S.
I would run the el84 heaters in series and use the 2 6V windings in series.
Ask a bunch of people, and you get a bunch of answers 😛
Ask a bunch of people, and you get a bunch of answers 😛
Depending on how well your transformer regulates, one winding could be used for the EL84's, each needs 760mA and the other for the ECC83. Try it, if two EL84's sit at around 6.3v on one winding that's fine, if not connect the two wngs in parallel.
Whatever you do remember to not leave your heaters floating, either connect one AC leg to ground, or use two 100 - 220r resistors (or pot) center tapped to ground or as suggested use a potential divider to elevate them, but don't forget to de-couple with a cap.
Andy.
Whatever you do remember to not leave your heaters floating, either connect one AC leg to ground, or use two 100 - 220r resistors (or pot) center tapped to ground or as suggested use a potential divider to elevate them, but don't forget to de-couple with a cap.
Andy.