ST-35 clone boards now available for repair or DIY.

Faithful to the Dynaco ST-35 original schematic and uses the 7247/12DW7. A variety of 7247/12DW7 types can be found at The Tube Store

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

(These are sold in pairs only)

PCB Sockets can be found here.

SCA-35 Amplifier Boards
SCA-35 Phono Boards

We are now carrying boards for the SCA-35!

Updated amp board uses the 6GH8A tube in place of the 7199. Some options for circuit improvements available on board, only if you wish to use them.

The phono board is faithful to the original that uses the 12AX7 and can be used for replacement or upgrade.

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

Documentation for the amp board here.
Documentation for the phono board here.

*UPDATE* Performance enhancement for the mainboard here.

Amp Board: (These are sold in pairs only)

Phono Board:

PCB Sockets can be found here.

DynaMull Driver for the ST-70

Mullard based driver for your ST-70!

Updated driver board uses the high transconductance 6EJ7/EF184 tube in place of the EF86 and sports a CCS in the phase inverter tail.

In our opinion, one of the best sounding driver boards for the ST-70.

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

Documentation for the DynaMull here.

PCB Sockets can be found here.

** Extras **

- 2N3904 - $2.00 USD/pr.

- ON Semi MJE340 - $3.00 USD/pr. (limited QTY - can't be purchased separately from the board)

- Mini heat sink suitable for the MJE340 - $1.50 USD/pr. (limited QTY - can't be purchased separately from the board)

- Four 3mm red LED's - $3.75 USD (limited QTY - can't be purchased separately from the board)

- Insulating pad and hardware set - $2.00 USD/pr.

Marantz 7C Clone Linestage PAS Mod
Marantz 7C Clone Phono PAS Mod

Bring this time-tested classic design to your PAS!

This is a slightly altered Marantz 7C design of their popular vintage phono and line stage.

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

Note: This is an advanced upgrade, requiring intuitive modification skills. Not recommended for beginners or those unfamiliar with the PAS!

Manual and instructions for the line stage.
Manual and instructions for the phono stage.

Application Note: Using the CVD PAS with 3-tube phono stage. Written for the Koren, but applicable to the 7C - AN-3.pdf

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

Recommended LED pilot lamp conversion found here.

Specify phono or line stage.



7C line stage, 7C phono stage and our PAS regulator board:


7C line stage, 7C phono stage our PAS regulator board, LED Power Indicator upgrade board and one 6" Blank FR4 board that fits on the back connector area for you to drill and add the connectors you choose:

Classic Valve Design PAS Line Mod

Less is more!

This single tube linestage allows you to select the overall gain for your PAS 2/3/3x preamp.

Advanced hybrid design that will catch the ear of even the tube purist. Clear and punchy, low on noise and high on dynamics, this design is a tube roller's dream. Offers a choice of 12SL7, 12AX7 or 5751 options on one board. Build, drop-in and go! No mods required to the power supply, even on a stock PAS.

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

Documentation for the Classic Valve Design PAS Line Mod.

Application Note: Using the CVD PAS with the PAS-K phono stage - AN-3.pdf

Note: This is an advanced design, not recommended for beginners or those unfamiliar with the PAS!

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

** Extras **

- IXTP1R6N50P MOSFET pair - $4.50 USD/pr. when purchased with the board.
($5.00 USD/pr. if purchased w/o PCB)

- MPSA42 pair - $1.00 USD/pr. (exclusive to this board)

Solid State Conversion Boards for the PAS

Want great MOSFET sound from your PAS2, 3 or 3X?

Check out our new set of line and phono stage boards for the PAS!

MooseFET Line Stage

MOSeiden Phono Stage

LED Power Indicator Upgrade

Norman Koren Linestage PAS Mod
Norman Koren Phono PAS Mod

These are the PAS boards developed by Norman Koren.

These are clean, punchy and HIGH GAIN mods for the PAS2/3/3x.

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

These boards are not for beginners. Please consult documentation carefully before purchasing these boards.

Manual and instructions for the line stage.
Manual and instructions for the phono stage.

Application Note: Using the CVD PAS with the PAS-K phono stage - AN-3.pdf

Design is © Norman Koren. We are an authorized reseller of this design.

Note: This is an advanced design, not recommended for beginners or those unfamiliar with the PAS!

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

Recommended LED pilot lamp conversion found here.

Specify phono or line stage.



Koren line stage, Koren phono stage and our PAS regulator board:


Koren line stage, Koren phono stage our PAS regulator board, LED Power Indicator upgrade board and one 6" Blank FR4 board that fits on the back connector area for you to drill and add the connectors you choose:

PAS Preamplifier Stock PCB's

Classic schematic Dynaco PAS PCB's.

Quality silk screened boards for repair or replacement.

Silkscreen for the phono board also includes values (in brackets) for the Bob Latino RIAA upgrade curve mod found here.

1.6mm thick FR4 laminate, plated through holes.

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

(These are sold in pairs only)

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 **

- IXTP1R6N50P MOSFET - $2.25 USD/ea. when purchased with the board.
($2.50 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.

Note: This is an advanced design, not recommended for beginners or those unfamiliar with the ST-70!

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 **

- IXTP1R6N50P MOSFET pair - $4.50 USD/pr. when purchased with the board.
($5.00 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)

** Fully Assembled and Tested ** - $180.00 USD (lead time, 1 business week)
Includes metal oxide or metal film resistors, where appropriate and Panasonic polypropylene capacitors. Like carbon film? Choose that and deduct $10 from the above price.
(Tubes not included and you still need to do the alignment for your amp)

** Combo Offer **
One assembled/tested DynaMutt (noval or octal) + assembled/tested ST-70 PSU for $250.00 USD
(tubes not included)

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.

Note: This is an advanced design, not recommended for beginners or those unfamiliar with the ST-70!

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



*NOTE* There is no free support for this board. Support rates apply from us or KTA-HiFi.

KTA-HiFi MK-III Noval and Octal Driver PCB

These are Mark III driver boards developed by Kevin Kennedy of KTA-HiFi.

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

Documentation for the noval can be found here along with installation instructions. Preliminary documentation on the octal boards here.

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

Note: This is an advanced design, not recommended for beginners or those unfamiliar with the MK-III!

Sockets for this board can be found here: 9-pin Minature and Octal.

or (Please specify noval or octal when ordering)

*NOTE* There is no free support for this board. Support rates apply from us or KTA-HiFi.

** Extras **

- NE-2 Neon Bulb - $0.75 USD/ea.
($1.25 USD/ea. if purchased w/o PCB)

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 MK-III Power PCB

New design MK-III 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.

Documentation and instructions for installation can be found here.

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.



** Fully Assembled and Tested ** - $110.00 USD (lead time, 1 business week)
(you still need to do the bias/balance for your amp)
Please specify power supply for original ST70, DynaMutt, DynaMull or KTA-HiFi, as R9/10 resistor values are dependent.