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Ink's fancy new old stock Vacuum tube amplifier.
Based on the classic Dynaco ST70 Class B super-linear audio amplifier, the design features a pentode preamp, push-push Class B transformer coupled, double linearized output stage. 

Built with modularity and expansion but also tradition in mind, the amp is entirely analog and free of disgusting semiconductors but has space in mind for adding a nixie tube-bargraph based digital VU meter and


Power Transformer Specs:

PA521 Specs:
Primary:
Blue to Blue 240V 50Hz @1A


Secondary:
Green to Green 6V3 @2A w/ CT Green-Yl
Brown to Brown 6V3 @2A w/ CT Brown-Yl
White to White 5V @ 4A
Red to Red 720V @300mA w/; CT Red-Yl and 55V Bias Red-Bl


Windings

Winding Diagram Cutout for the power Transformer:


(Values need to be verified )

Modified Transformer Specs:


Primary:
Blue to brown: 230V 50Hz @1A


Secondary:
Green to Green 6V3 @2A w/ CT Green-Yl
Brown to Brown 6V3 @2A w/ CT Brown-Yl
White to White 5V @ 4A
Red to Red 720V @300mA w/; CT Red-Yl and 55V Bias Red-Bl


Windings

Primary

fromtoturns
bluebrown530

Secondaries

fromtoturnsoldTarget Voltage @ 230V in
Filament



grey1grey-yl773,15V
grey-ylgrey2773,15V
Power



red1red-bl703674305V
red-blred-yl12712155V
red-ylred2830795360V
5V



white1white212115V
Filament



brown1brn-yl773,15V
brn-ylbrown2773,15V
Total
1700 (~306m)

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