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Seller Store delta9electronics
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Location: Baldwin
Ships to: US,
Item: 225869582726

Returns Accepted:ReturnsNotAccepted
STK-0050-A4:STK-0050-A4
MPN:STK-0050-A4
Custom Design:Custom Design

New: In Kit formDesigned to replace the STK-0050 in the Pioneer SX-780 and other stereo receivers using the old Sanyo moduleThey have been successfully used in Fisher, Technics amp and receiversEliminates the probability of poor quality modulesDiscrete design allows for easy repair, improves reliability and performanceCan be used with many amplifier front-ends to make a complete amp. You need special tools such as a soldering iron, DC voltmeter, side cutters, needle nose pliers, screw drivers etc.Prior Audio Electronic knowledge and interpretation is helpful. There is help at Audiokarma Will ship these complete kits International Note: All Electronic Components are supplied Listing is for two blank PCB’s, heatsinks, all parts, wire, documents, assembly instructions for two modules Free support and no returns.The module will improve the amplifier’s reliability and operational specifications for stereo’s using STK modules, up to 75 watts.Outputs transistors are specified as Toshiba or Onsemi 150W devicesOutput transistor bias adjustment is included in circuit design. This allows for the modules to be adjustable for matched performanceYou can use this design to replace STK-0040,0050,0070,0025,0029,0039Refer to the table showing all the possible types that these STK’s can replace. For higher power amps and low impedance speakers, use the STK-0070 with 200W transistorsSince we use an integral heatsink the parts is larger than the original but uses the same mounting holesThe top of the heatsink is 15mm from the mounting holes and the HS is 96mm wideHeatsink is tapped for M3 x 0.5 screws, supplied Expected Performance:Total Harmonic Distortion:~0.02% ( 20-20KHz,4-8 ohm, 31mA bias) Gain (based on Pioneer SX-780 design) = 15.5 (23.8 dB)Bias: Each emitter resistor in the SX-780 are 0.22ohm, that would be 0.22 *0.031A =7mV across each emitter R or 14mV across the two of them.Increasing the bias current will make the output transistors to run hotter. This lowers the crossover distortion and allows for a larger class « A » operating region. Reference:Google: « STK-0050 Replacement for SX-780 and others » @ Audiokarma web site for additional details on our design

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