JD 502 P with 6550/KT88s

Looking for a power amplifier with heft and speed. The 502P will give you separation and inner dynamics that will drive the most demanding in music. Ez biasing and long tube life assures minimal maintenance for your unit.  

Rated Output Power:           60 W per channel at 8 ohms, 22Hz to 60KHz

Maximum Power Output:    85 W per channel at 8 ohms,  1KHz

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:                   2 V 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:                                   50 pounds (18 Kg) net, approximately 55 pounds (21 Kg) packaged

Warranty:                               Two year limited parts and labor. One year or 3000 hours whichever comes first on Jolida Tubes.                                                                          

Bias Settings:                        500 millivolts + 50 mV

Fuse:                                      110 - 120 VAC, 6.3 Amp Fast Blo; 200 - 240 VAC, 3 Amp Fast Blo

                                                Size 5mm X 20mm

Construction Details and Features: 

o Stereo Power Amplifier: Input 2 V driving 60 watts, maximum 85 watts output.

o Multiple Inputs: RCA and XLR inputs.

o 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.

o Top panel bias testing terminal with bias adjustment controls plus EZ-biasing.    

o State of the Art Components: Hexfred Diodes, ceramic composite grid resistors, custom coupling caps.

o Low Feedback Design: Only 5 dB

o Available in Black or Silver

Warranty:  Two year limited parts and labor. One year or 3000 hours whichever comes first on Jolida Tubes.   

Client Testimonials
  • There is tight and nice lower bass that adds to the bass excitement. The mids are lush and transparent. The highs are extended without being etchy. There is nice air around the instruments. This is a warm sounding tube amp without any tube veiling.

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  • JoLida made its name with what used to be called "popular priced" tubed electronics that offered exceptional value-for-dollar.

    The Audio Beat
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