Jolida vacuum tube amplifiers

Roanoke VA

Jolida

JD502B

Technical Specifications:

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