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Marchand Electronics mb401 Manual

300 watt mosfet power amplifier
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Marchand Electronics Inc.
PO Box 473, Webster, NY 14580
Tel:(585) 872-0980 Fax:(585) 872-1960
info@marchandelec.com http://www.marchandelec.com
(c)2002 Marchand Electronics Inc.
MB401 300 Watt MOSFET Power Amplifier
500W into 4 Ohm
300W into 8 Ohm
1
©2001 Marchand Electronics Inc. PO Box 473 Webster NY 14580 (585)872 0980 www.marchandelec.com

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Summary of Contents for Marchand Electronics mb401

  • Page 1 PO Box 473, Webster, NY 14580 Tel:(585) 872-0980 Fax:(585) 872-1960 info@marchandelec.com http://www.marchandelec.com (c)2002 Marchand Electronics Inc. MB401 300 Watt MOSFET Power Amplifier 500W into 4 Ohm 300W into 8 Ohm ©2001 Marchand Electronics Inc. PO Box 473 Webster NY 14580 (585)872 0980 www.marchandelec.com...

  • Page 2: Specifications

    Features The MB401 is a mono MOSFET power amplifier for high quality audio reproduction. The construction is all heavy- duty. The amplifier is housed in an aluminum chassis. Heatsinks on the rear of the unit provide the cooling. Inside is a toroidal power transformer and power supply with large storage capacitors. The amplifier is designed for use with a 4 or 8 Ohm load, but it is stable with any output load.
  • Page 3 MB401 Power Amplifier Left out hi out lo MB401 Power Amplifier Right Electronic Crossover XM6, XM9, XM16 or XM26 Figure 2 Sound System with 2-way Electronic Crossover Network ©2001 Marchand Electronics Inc. PO Box 473 Webster NY 14580 (585)872 0980 www.marchandelec.com...
  • Page 4 Figure 3: Inside view. Note the placement of the MB401 power amplifier board (mounted on heatsink on the rear of the unit) and the PS112 power supply board; (mounted onto the bottom of the chassis) . The toroidal power transformer is mounted near the left of the unit on the baseplate.
  • Page 5 Figure 4 Rear view of the amplifier. Figure 5 Inside view of the rear panel ©2001 Marchand Electronics Inc. PO Box 473 Webster NY 14580 (585)872 0980 www.marchandelec.com...
  • Page 6 4/40 x 1/2” panhead 4/40 x 1/2” flathead Front panel: Mount the front panel and front panel #4 kepsnut spacer to the chassis using the 4 6/32 x 5/8" ©2001 Marchand Electronics Inc. PO Box 473 Webster NY 14580 (585)872 0980 www.marchandelec.com...
  • Page 7 Use #22 wire for all other interconnect. Bolt Metal Plate Rubber washer Transformer Rubber washers Use two of these. Chassis bottom Figure 6 : Mounting of power transformer ©2001 Marchand Electronics Inc. PO Box 473 Webster NY 14580 (585)872 0980 www.marchandelec.com...
  • Page 8 ***connect primary like this for ***use black wires with xformer with 240V line single primary MB401 Power Amplifier Power wiring (c)2002 Marchand Electronics Inc. ©2001 Marchand Electronics Inc. PO Box 473 Webster NY 14580 (585)872 0980 www.marchandelec.com...
  • Page 9 Use heavy 18 MB301 Power Amplifier gauge wire for the Signal Wiring speaker wires only (c)2000 Marchand Electronics Inc. Figure 7 : Rear panel wiring for signal and speaker. ©2001 Marchand Electronics Inc. PO Box 473 Webster NY 14580 (585)872 0980 www.marchandelec.com...
  • Page 10 NPN transistor Ceramic NPO 2N2907 PNP transistor 47uf, 100v Aluminum Electrolytic IRFI640 N-Channel Power MOSFET 47uf, 100v Aluminum Electrolytic Q17** IRFI640 N-Channel Power MOSFET 1000 pF Ceramic Disk ©2001 Marchand Electronics Inc. PO Box 473 Webster NY 14580 (585)872 0980 www.marchandelec.com...
  • Page 11 Be sure to observe polarity markings when installing. The stacked film capacitors are brown and have marking 224 for .22 uF and 105 for the 1 uF part. ©2001 Marchand Electronics Inc. PO Box 473 Webster NY 14580 (585)872 0980 www.marchandelec.com...
  • Page 12 Assembly is now complete. Take a few minutes to check all components and orientations. Also make sure there are no solder bridges. Bias current adjustment (Class AB) . ©2001 Marchand Electronics Inc. PO Box 473 Webster NY 14580 (585)872 0980 www.marchandelec.com...
  • Page 13 C10A,B,C,D R30 A,B,C,D,E,F,G,H Q17A,B,C,D,E,F,G,H R32 A,B,C,D,E,F,G,H R31 A,B,C,D,E,F,G,H heatsink R35 A,B,C,D,E,F,G,H R36 A,B,C,D,E,F,G,H Q18 A,B,C,D,E,F,G,H R34 A,B,C,D,E,F,G,H C16 A,B,C,D MB401 MOSFET Power Amplifier (c)2002 Marchand Electronics Inc. ©2001 Marchand Electronics Inc. PO Box 473 Webster NY 14580 (585)872 0980 www.marchandelec.com...