Hello,
Whist looking through some stuff to find a circuit for the PYE Super Black Box I came upon the original circuit for the Dulci DPA10 preamplifier and power amplifier and remembered this thread, and I felt for completeness I should post it on the forum.
I did a Triode EF86 mod on a Sterns 10Watt ECL86 amplifier see this thread:
https://www.vintage-radio.net/forum/...ad.php?t=99399
Regards
Terry