Headwize OTL Headphone Amplifier
This was the original chassis - completely built from scratch. Unfortunately could not fit all the components in the one box (DOH!!).
Power transformers are from Maplin - two needed due to filament power demands.
And here's the new effort, utilising the recommended Hammond Power Transformer. Quite chuffed with this one !! Phones used are Sennheiser HD540 Reference (300ohm) from many years ago. Works like a charm......