Modules
STK0050+
Replaces STK0050/30/40 in Pioneer SX-780 or Marantz SR4000
This module is listed for individual sale.
Ready to use module replaces the Sanyo STK0030/40/50, but more robust. The STK0050+ fits these models and probably a lot more:
SX-780, SR4000, KR-5010, RS-2004A, JA-S44, JCX-2050
NOTE: The STK0030/40/50 family is smaller than the STK0060/70/80 family.
Compact design, with the same mounting holes as the original Sanyo. With just six solder connections, it takes a professional tech about 10 minutes to replace this module in a Pioneer SX-780. Typical current gain 8,000-20,000 vs original 5,000. 15 amp, 160 volt transistors INSTEAD of the original 5 amp, 110 volt part. These same power transistors are used in the 140 watt per channel Marantz SR8012, Denon AVR-X7200W, and the Yamaha RX-A3070.
- NO bias adjustment, preset during testing.
- NO paste needed, we supply silpads.
- NO drilling or grinding to fit, only 4mm wider than the Sanyo.
- NOT 35 years old or counterfeit. Sanyo quit making these in 1983.
- YES, every module tested in our Pioneer SX-780 or Marantz SR 4000.
- YES, gold-plated PCB. PCB Finish, ENIG (Gold), compliant with IPC-4552.
- YES, 4 ohm speakers. We use 15 amp outputs vs original Sanyo 5 amp devices.
- YES, free USPS shipping in the USA.
| SX-780 typical performance into 8 ohms with the tone controls bypassed: | ||
|---|---|---|
| 45 watt | 1k 0.0039% | 20k 0.0051% |
| 4.5 watt | 0.5k 0.0029% | |
| 1.0 watt | 1k 0.0047% | 20k 0.0177% |
| Performance into 4 ohms: | ||
|---|---|---|
| 88 watts | 1k 0.0095% | 20k 0.0290% |
| 1 watt | 1k 0.0036% | 20k 0.0934% |
| Noise | -80 dBv | 22-22k BW Audio Precision P1+DD test set |
| S/N | 106 dB | 22-22k |
| S/N | 116 dB | A-wtd |
Hand tools and simple solder skills required. Technical knowledge required. No returns and limited support, this is not for beginners. We do supply instructions and helpful test tips.