Virtual Ground ?

[Bernhard]

Thanks everybody, I liked very much the looks of the aluminum potted transformers of the Pioneer A-878 amps

[wg_ski]

Originally posted by Bernhard
Thanks everybody, I liked very much the looks of the aluminum potted transformers of the Pioneer A-878 amps

It's good that you like them, because any of these potential amp topologies really require a separate trafo for each channel. make sure the chassis is heavy enough to handle it .

[Bernhard]

Unfortunately those trafos have no center tap.
In that amp there is one trafo per rail instead of one trafo per channel.

[wg_ski]

Crown grounded bridge requires one trafo (or at least isolated windings) per channel, and requires no center tap. The QSC also requires isolated supplies, and can be built without the center tap. The QSC class H varieties require center taps, but the basic transnova circuit does not need it. Thier old circuits just used two caps (and didn't even bother with the equalization resistors).