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SDS 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$89.95
BypassCaps: 

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