MZ-CAP-1

Click here to order: With Capacitors, Without Capacitors

Click here to download the installation guide: With Capacitors, Without Capacitors

This kit replaces both dual electrolytic capacitors used in the Marantz 2385 and 2500 with four modern-production, Kemet 8200uF/100V 105°C screw-in capacitors. Available with or without capacitors.

A custom capacitor mounting board attaches to the Marantz via four pre-existing screw holes. Wiring is done from the bottom of the unit and is made easier by the use of robust wiring turrets. Footprints are provided for installing the bleeder resistors on the circuit board, but they can also be left where they are and attached to the wiring turrets. The mounting board itself is manufactured with double-sided 2 ounce copper and large copper pours to ensure very low impedance connections to the turrets, a 2.4 mm thick FR-4 laminate to reduce board flex, and a gold finish.

If you are ordering this kit without capacitors, please see the section What You Will Need below:

What You Will Need

The mounting board was designed to fit four Kemet ALS80A822DF100, which is an 8200 uF/100 V screw-in capacitor. These do not ship with the necessary screws, so you will also need eight M5-0.8 x 12 mm machine screws with head diameter 11 mm or less (e.g. Prime-Line 9131367) and eight M5 internal tooth lock washers.

The dimensions of the Kemet capacitors are 36 mm diameter, 107 mm height, 12.80 mm CTC mounting stud spacing, and it uses M5-0.8 threads. I recommend using this specific part (or one in the same family, ALS80-A-DF). If you need to select a different capacitor, there are some important caveats listed below:

• Make sure the capacitor diameter does not exceed 36 mm and the height does not exceed 107 mm, otherwise the capacitors may not fit on the board or inside the unit
• Make sure the screw stud spacing is 12.80 mm and the thread type is no larger than M5-0.8, otherwise the screws may not fit through the holes in the board
• Make sure the rubber plug for the capacitor’s pressure relief vent aligns with the hole on the mounting board. You may need to drill new holes if the orientation of your capacitor’s positive and negative terminals differs
• This kit includes a set of spacer boards for each Kemet ALS80-A-DF style capacitor that account for the length of the mounting studs to reduce mechanical stress on the mounting board. If you select different capacitors that have long mounting studs, the included spacers may not fit

If you have any doubts about the fitment of your choice of replacement capacitors, feel free to send us a message.

Parts Included (With Caps)

• One capacitor mounting board (2.4 mm thick TG150 FR-4, 2 oz. copper, green solder mask, immersion gold finish)
• Twelve wiring turrets
• Four 3″ lengths of 16 AWG wire for connecting the grounds of each capacitor bank
• Four Kemet 8200uF/100V 105°C screw-in aluminum electrolytic capacitors with screws and tooth lock washers
• Twenty capacitor spacer boards designed for the Kemet ALS80-A-DF family (5 per capacitor)
• Mounting hardware (four #6-32 threaded standoffs, nuts, and screws)
• Step-by-step installation guide

Parts Included (Without Caps)

• All of the above except the four Kemet capacitors and capacitor screws