PAS Preamplifier Regulated Power PCB

This PCB is for adding a regulated power supply to your PAS preamplifier.

Will fit the PAS2, PAS3 and PAS3x in the same place as the large heater filter caps and selenium rectifier. Replaces the old can cap and heater supply capacitors.

This regulator will draw less than 2mA and provides extremely clean power for your stock PAS PC-5 and PC-6 boards, as well as upgrade boards you may be using.

1.6mm thick FR4 laminate, double sided with plated through holes.

Documentation on this board can be found here.

** Extras **

- IRF710 MOSFET - $1.25 USD/ea. when purchased with the board.
($1.50 USD/ea. if purchased w/o PCB)

- TO-220 heatsink - $1.25 USD/ea.

- TO-220 insulating pad, shoulder washer and hardware set - $1.00 USD/set.
($1.50 USD/set. if purchased w/o PCB)

ST-70 "DynaMutt" Octal PCB
and
ST-70 "DynaMutt" Noval PCB

DynaMutt is our own driver board design for the Dynaco ST-70.

DynaMutt is based on a 5751 or 6SL7GT intput and 6CG7/6FQ7 or 6SN7GT phase inverter (depending if you choose noval or octal).

The phase inverter uses an AC autobalancing circuit and is practically insensitive to tube section mismatching. The automatic AC balancing allows for maximum linearity of your ST-70 right up to its full output.

1.6mm thick FR4 laminate, double sided with plated through holes.

Documentation on this board can be found here for the noval and octal versions.

PCB Sockets for these boards can be found here for the noval and octal.

** Extras **

- IRF710 MOSFET pair - $2.50 USD/pr. when purchased with the board.
($3.00 USD/pr. if purchased w/o PCB)

- TO-220 heatsink pair - $2.50 USD/pr.

- TO-220 insulating pad, shoulder washer and hardware set - $2.00 USD/pr.
($3.00 USD/pr. if purchased w/o PCB)

- 100 ohm CERMET trimmer pair - $2.00 USD/pr. when purchased with the board.
($2.50 USD/pr. if purchased w/o PCB)

Dynaco ST-70 (clone) PCB

New ST-70 clone PCB's based on the original design by Dynaco. Same schematic, size and mounting as the original ST-70.

1.6mm thick FR4 laminate, double sided with plated through holes.

Great for DIY clone amplifier or repair/restoration of an original model.

Documentation on this board can be found here.

9-Pin Minature PCB Sockets for this board can be found here.

This board also available as a kit here.

LED Power Indicator Upgrade

Upgrade the old #47 or #53 incandescent bulb in your PAS or SCA-35 with this PCB!

Great for DIY clone amplifier or repair/restoration of an original model. With an LED, you can draw less current than the stock incandescent and have a cooler running amp.

Documentation on this board can be found here.

KTA-HiFi ST-70 Driver PCB

These are ST-70 driver boards developed by Kevin Kennedy of KTA-HiFi.

This is a clean, excellent sounding design in our listening tests.

1.6mm thick FR4 laminate, double sided with plated through holes.

Schematic and info can be found here.

Design is © Kevin Kennedy, KTA HiFi. We are an authorized reseller of this design.

9-pin Minature PCB Sockets for this board can be found here.



Some of this item is also available as a "Scratch and Dent" offer here for a saving.

Mark-III Driver PCB

Classic schematic Mark-III monoblock driver PCB's.

1.6mm thick FR4 laminate, double sided with plated through holes.

9-pin Minature PCB Sockets for this board can be found here.

or

Dynaco ST-70 Power PCB

New design ST-70 power supply PCB's that include bias balance controls to allow bias balancing between output tubes. "Failsafe" trimmer wiring so if the wiper fails, the tubes go into cutoff, rather than being destroyed like the original bias circuit.

1.6mm thick FR4 laminate, double sided with plated through holes.

Documentation and instructions for installation can be found here.