  These SDS Labs and TriodeElectronics Power Supply boards replace the original can capacitors in Dynaco Mk3, Mk2 and ST70. 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 60-60-60-60 uF (two 120 uF in series per section) and the voltage rating to 630V per section and 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. The New version ST70 kit increases capacity from the original, 30-20-20-20 to 40-195-135-135. For a rock solid power supply with much tighter bass. And a smaller footprint for a much easier fit. One board is required per amplifier. Note that if you buy a blank board, the board capacitors must be radial lead and on the Mk3 board cannot exceed 25 mm high by 25mm diameter, on the ST70 board cannot exceed 25mm high by 30mm 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. Capacitors supplied with the board + parts kits are Chemicon and CDE parts temperature rated 85 C. |
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