In Reply to: Searching for Angela Instruments Schematic for conversion of Dyna ST70 to 6B4G??? Thx! posted by SambaMaster on July 24, 2012 at 08:53:15:
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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Follow Ups
- RE: Searching for Angela Instruments Schematic for conversion of Dyna ST70 to 6B4G??? Thx! - Tre' 20:58:06 07/24/12 (1)
- RE: Searching for Angela Instruments Schematic for conversion of Dyna ST70 to 6B4G??? Thx! - Joe Roberts 00:57:44 07/25/12 (0)