A quick update on the differential (push pull) amps.
The first mono amp and it's power supply are completed and went through some bench tests. This is the 'naked' amp section:
Lot's of iron and absolutely no capacitor at all in the signal chassis! As can be clearly seen in this shot from the side:
Power output is a solid 15W.
The power supply section of course has some smoothing caps:
Filament supplies on the bottom and high voltage supply above.
Another photo of the signal section:
Once the second channel is complete listening will start. Measurements are promising. 15W of deep Class A sound. No capacitor colorations since there are simply none in the signal path!