I have a very clean 60 wpc trade-in Jolida JD-502P power amplifier. It is rated 8/10.
This power amp is an upgraded version of the 6550/KT88 tube amp as used in the JD-502BRC integrated amp. It adds Ultra Fast HEXFRED's in the power supply as well as custom Jolida capacitors and ceramic composition resistors. There are two 6550 tubes per channel to produce the great dynamics, detail and sonics that 6550/KT88's are famous for.
The 502P has both XLR balanced inputs as well as single ended RCA inputs to work with any preamp. It uses custom wound Audio Transformers with a core of German grain oriented silicon steel. This is a 15th generation proprietary Jolida design. The secondary can be configured for a 4 ohm or 8 ohm speaker load. It uses gold plated RCA input jacks, audiophile grade carbon composite grid resistors, HEXFRED high speed soft recovery diodes and poly tin coupling capacitors. The EZ bias system uses LED's so no meter is required.
This is a high quality tube amp that will run most loudspeakers. It offers great value at its $1100.0 retail.
My amp is rated 8/10 for a small mark on the transformer cover. The face is perfect and the amp looks great as seen in the photos.
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-Maximum Power Output: 85W/channel at 8 ohms, 1KHz
-Rated Output Power: 60W/channel at 8 ohms, 22Hz to 60KHz
-Frequency Response: (@1 watt into 8 ohms) 8Hz-130KHz + 1dB
-Bandwidth: 15Hz-80KHz + 3dB; 0dB 60W 1KHz
-Distortion THD: Less than 1% at 20V output, 28Hz to 15KHz
-Circuit Type: Ultra Linear, Class AB
-Input Impedance: 100Kohms
-Input Sensitivity: 1.2 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" wide x 15" deep x 7.5" high
-Weight: 50 pounds (18 Kg) net, approximately 55 pounds (21 Kg) packaged
-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
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