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Model JD 502B

Construction Details and Features:

  • Fully Integrated Stereo Amplifier: Input 600mV driving 60 watts, maximum 85 watts output.
  • Multiple Inputs: Front mounted selector switch-CD, Tape Recorder, Tuner and Aux (for TV, DVD Player, VCR or Computer).
  • Right and Left Stereo Balance Control: + 50dB at both right and left front panel control.
  • Custom Wound Audio Transformers with a core of German grain oriented silicon steel. 15th generation proprietary design. Secondary can be configured for a 4 ohm or 8 ohm load.
  • Top panel bias testing terminal with bias adjustment controls.
  • State of the Art Components: ALPS audio potentiometer, gold plated RCA input jacks.
  • Low Feedback Design: Only 5 dB.

Technical Specifications:

Maximum Power Output:
85 W per channel at 8 ohms, 1KHz
Rated Output Power:
60 W per channel at 8 ohms, 25Hz to 60KHz
Frequency Response:
(at 1 watt into 8 ohms) 8Hz to 130KHz + 1dB
Bandwidth:
15Hz to 80KHz + 3dB; 0dB 60 W 1KHz
Distortion THD:
Less than 1% at 20 V output, 28Hz to 15KHz
Circuit Type:
Ultra Linear, Class AB
Input Impedance:
100Kohms
Input Sensitivity:
600mV at 1KHz for 60 watt output
Output Impedance:
4 ohms and 8 ohms
Negative Feedback:
Less than 5 dB
Noise and Hum:
85dB below rated output
Tube Complement:
2 matched pairs (4) of 6550/KT88 power output; 2 pcs. 12AX7A/ECC83 pre-amplifier; 2 pcs. 12AT7/ECC81 power drivers.
Power Requirements:
110V-120 VAC 60Hz 180 watts-standby, 450 watts maximum (220 VAC 50Hz option).
Dimensions:
17 inches (43cm) wide by 15 inches (38cm) deep by 7.5 inches (19 cm) high.
Weight:
39 pounds (18 Kg) net, approximately 46 pounds (21 Kg) packaged.
Warranty:
Two year limited parts and labor. One year or 1000 hours whichever comes first on Jolida Tubes.
Bias Settings:
50 millivolts + 5 mV
Fuse:
110 - 120 VAC, 6.3 Fast Amp Blo; 200 - 240 VAC, 3 Amp Fast Blo