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Driver Boards for Dynaco Mark II and Mark III

Our newest version includes a filament jumper allowing use of tubes with 9AJ or 9LP pinout, thus allowing use of 6CG7/6FQ7 or 6N1-P as a phase splitter with no changes required other than changing the board jumper. For more information, please see our Dynaco Page.
"Blank Board" means just that, you supply the parts.
"With Parts" means all board parts, you solder on board yourself.
"With Parts" includes some off board resistors (for input, etc)that normally need replacing. All kits include instruction manual, but not tubes, each board requires 1 each 12AU7/ECC82 (or equivalent, 6189,5814,etc) plus one each of either 12AU7/ECC82, 12BH7, 6CG7/6FQ7 or 6N1-P. Standard coupling capacitors are Xicon metallized polypropylene. You can get Sprage 715P polypropylene film & foil instead for a little extra.

SDS Labs Power Supply Boards replace the original aluminum can capacitor. The original may be left in to cover the hole in the chassis.


mkandmk2boa

Mark3/Mark2 Upgrade Driver Board Only With Instruction ManualMark3/Mark2 Upgrade Driver Board Only With Instruction ManualOne Dynaco Mark 3/Mark 2 blank upgrade board and instructions only (no parts). Each amplifier requires one board.

mk3boardonly$34.95
Mark3/Mark2 Upgrade Driver Board with PartsMark3/Mark2 Upgrade Driver Board with PartsOne Dynaco Mark 3/Mark 2 upgrade board with parts and instructions. Each amplifier requires one board. The Board uses a Cascoded 12AU7 into a Long Tailed Pair Phase Inverter. Choose Capacitors in dropdown menu: Standard (Xicon), Sprague, or Solen.

NOTE: The board is Pictured with Solen Coupling Capacitors, you will recieve Xicon Polypropylene Capacitors with the Standard Kit.



mk3boardsparts$58.95Version: 
DIYTube Mark III Poseidon Driver BoardDIYTube Mark III Poseidon Driver BoardDriver board designed by Shannon Parks over at DiyTube.com. Engineered as a replacement driver for the Dynaco Mark III & IV as well as your own DIY monoblock, the diytube Poseidon uses a 12AX7 and a 12AU7 for pure triode perfection allowing use of an almost limitless selection of NOS and new tubes. This new driver uses the classic modified Mullard topology with constant current source in the tail of the phase splitter - a perfect mix of performance and warm tube sound.

* FR-4 fiberglass construction that will last a lifetime * top & bottom silkscreen ensuring easy assembly and friendly modding * a ruby red solder mask finish that will never make your amp look like a science fair project * a drop-in replacement with no other changes needed * detailed schematics & a parts list * support provided at the growing community forum at diytube.com

Order Board Only, No Parts Included, OR for a limited time only, offered "With Parts" (see dropdown menu). Note Price is for one board only, if you are rebuilding a pair of MkIII's you will need to order two boards.

DIYTube Mark III Poseidon Driver Board diytubemk3$34.95
Parts: 
SDS Labs Mk3 Capacitor Board, Blank with instructionsSDS Labs Mk3 Capacitor Board, Blank with instructionsThe Mk3 board increases capacity to 50-50-50-50 uF (two 100 uF in series per section) and the voltage rating to 630V per section (800V if you leave out the .1 uf bypass caps) eliminates capacitor problems the original 525V rated cap had that are caused by high line voltages and allows the use of solid-state diode replacements as well as the original tube (5AR4/GZ34 or 5U4) rectifier.The Mark 3 board also works on Dynaco Mark 2 (50 ohm 5W resistor required for Mark 2, not included), and most Sunn amplifiers that use Dynaco transformers (some Sunns will need additional resistors not included in the kit.
One board is required per amplifier.


Note that if you buy a blank board, the board capacitors on the Mk3 board cannot exceed 25 mm high by 25mm diameter in order to fit under the chassis. In all cases the first section should not exceed 60 uF if a tube rectifier is used.
One can use these boards for homebrew projects, any Panasonic TS series (or equiv such as Sprague 80D or 82D) that don't exceed diameter limits can be used, taller ones can be used if you have clearance.
Boards measure 3 inches (approx 77 mm) wide by 4 inches ( 102 mm) long, with about 1/4 (6.5 mm) overhang on each side for mounting standoff.

MK3 Cap Board Instructions

sdsmk3blank$26.95
SDS Labs Mk3 Capacitor Board, with parts and instructionsSDS Labs Mk3 Capacitor Board, with parts and instructions
These Power Supply boards replace the original can capacitors in Dynaco Mk3, Mk2 and many Sunn amplifiers. Fit on standoffs under the output transformers, no cutting or drilling required to install, just bolt in, hook up the wires and go!
The Mk3 board increases capacity to 50-50-50-50 uF (two 100 uF in series per section)and the voltage rating to 630V per section to eliminate capacitor problems the original 525V rated cap has that are caused by high line voltages and allows the use of solid-state diode replacements as well as the original tube (5AR4/GZ34 or 5U4) rectifier.The Mark 3 board also works on Dynaco Mark 2 (50 ohm 5W resistor required for Mark 2, not included), and most Sunn amplifiers that use Dynaco transformers (some Sunns will need additional resistors not included in the kit.

One board is required per amplifier.
Note that if you buy a blank board, the board capacitors on the Mk3 board cannot exceed 25 mm high by 25mm diameter, in order to fit under he chassis. In all cases the first section should not exceed 50 uF if a tube rectifier is used.
One can use these boards for homebrew projects, any Panasonic TS series (or equiv such as Sprague 80D or 82D, or Chemi-Con KMH )that don't exceed diameter limits can be used, taller ones can be used if you have clearance.
Capacitors supplied with the board + parts kits are Panasonic TS Series parts temperature rated 85 C. Boards measure 3 inches (approx 77 mm) wide by 4 inches ( 102 mm) long, with about 1/4 (6.5 mm) overhang on each side for mounting standoff.

MK3 Cap Board Instructions

sdsmk3parts$68.95
BypassCaps: 
Bias Repair Set for Mark 3Replaces selenium bias rectifier with silicon diode, also includes resistors & capacitors used in bias circuit that are not on the printed circuit board. Parts Included: 1K 2W Resistor, 18K 2W Resistor, .022uF 630V Capacitor, 100uF 100V Capacitors x 2pcs, & 1N4007 Diode. Some of these parts are also included in the Dual Bias Kit on this page.One set required per amplifier

biaskitmk3$4.95
Dual Bias Kit for Dynaco Mk3/Mk2 Amplifiers with Triode Electronics upgradeThis allows for biasing each 6550/KT88/EL34 tube individually rather than as a pair, note that a hole must be drilled for an additional bias control to use this. Parts Included: 1K 2W Resistor, 18K 2W Resistor, 47uF 100V Capacitors x 2pcs, 25KL Potentiometers x 2pcs, & 1N4007 Diode. Kit includes parts that are in the regular Bias Repair kit as well.This kit works only with our board. One kit required per amplifier

dualbias$9.95


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