If the PPX3 SLAM has an output impedance of 30 ohms, then bass will be loose and flabby. High output impedance actually boosts bass response for most headphones, but it won't be high quality bass.

The last thing the PPX3 has is loose flabby bass.

The last thing the PPX3 has is loose flabby bass.

Earl,

you're letting your ears override what specs tell you it should sound like

aerius, i'll build it with what i have on hand: 240V B+, 4k primary SE transformer, should be fine?

Well, there's this slight problem of making a push-pull amp run with a single-ended transformer...