JP200 Preamplifier User Manual
Contents
1. Fuse should be used either in power transformer or main socket to avoid accidentally large current drawing e Always contact technicians or experts to seek help PROCEDURES 1 Solder all the components according to the schematic part list and photo 2 Unplug the vacuum tubes Apply 260 400V DC to P1 12 6 V DC to HA and HB Try the lower voltage first before using higher voltage to ensure all components are correctly placed 3 Measure the voltage at Pl HA and HB without applying input signal The voltage of Pl connecter should be 260 400VAC for high voltage supply and HA and HB connector should be 12 6V AC for filament power supplies 4 If the AC voltages at the Pl HA and HB are corrected then plug the tubes in the sockets and turn on the power supply 5 Choose an optimum voltage 280V DC for Pl to attain best sound performance If you have any problem in assembly please contact us by email to tech analogmetric com www analogmetric com Page 32. JP200 Vacuum Tube Preamplifier User Manual Analog Metric JP200 VACUUM TUBE PREAMPLIFIER USER MANUAL ENGE SAVES ETS INTRODUCTION The Circuit design is modified based on the classical Jadis preamplifier and the values are optimized It produces sweet and detail sound Fast metalized polypropylene capacitors in audio grade are used for AC signal coupling To enhance the performance of the power supply unit the lengths of power routing path and signal paths are minimized so as to minimize the total path impedances The placements of the components are in symmetric between two channels This preamplifier can be power by either tube voltage regulator or silicon voltage regulator FEATURES e Six vacuum tubes 12AX7 e Two single ended inputs and two single end outputs for stereo e Voltage gain 20dB e Dynamic range output voltage max 20Vrms e S N ration gt 90dB e Power requirements one 260 400V DC 100mA and one two 12 6V AC 1A e PCB dimension 180mm W x 210mm L www analogmetric com Page 2 JP200 VACUUM TUBE PREAMPLIFIER USER MANUAL e PCB thickness 2 5mm double layer 20z copper PRECAUTIONS e Do not use finger or any body parts to touch the components or board It is hazardous since the high voltage capacitors may not be fully discharges after switched off the power supply e Turn off the power supply if the transformer is getting hot or some smoke is observed or strange buzz sound is heard e
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