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RE: Searching for Angela Instruments Schematic for conversion of Dyna ST70 to 6B4G??? Thx!

Not what you looking for but years ago I took a pair of dyna 70's and made a pair of mono block 6b4g PP amps.

Removing one OPT on each chassis made room for proper input chokes to knock the B+ down.

Two filament winding and hum pots lowered the hum.

Two 9 pin sockets and I did a modified Williamson front end.

With no feedback they are gainy. :-)

The customer's widow is enjoying them to this day.

If I were to re-do them today I would use a center tapped, phase inverting grid choke and a single driver stage. Something like the Seth.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"


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