nostromo
pfm Member
Hmmm... Did you see this recently resurrected thread:JW has an established record as a DAC designer.
As a power amplifier designer, no.
With the benefit of hindsight, the VFET design was a distraction for both the sponsors and his own limited resources
https://pinkfishmedia.net/forum/threads/effed-up-quad-909-uk-made.161401/
Particularly pages 3 and 4. JW manages to very easily fix and improve this Quad 909 power amp. He suggests he could improve it even more and is worried about IP theft particularly by the Chinese.