JP200 Preamplifier User Manual
JP200 Vacuum Tube
Preamplifier User Manual
Analog Metric
[JP200 VACUUM TUBE PREAMPLIFIER USER MANUAL] Analog Metric
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
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Six vacuum tubes 12AX7
Two single-ended inputs and two single-end outputs for stereo
Voltage gain: 20dB
Dynamic range: output voltage max. 20Vrms
S/N ration: >90dB
Power requirements: one 260-400V DC (100mA) and one two 12.6V AC(1A)
PCB dimension: 180mm (W) x 210mm (L)
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[JP200 VACUUM TUBE PREAMPLIFIER USER MANUAL] Analog Metric
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PCB thickness: 2.5mm, double layer, 2oz copper.
PRECAUTIONS
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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.
Turn off the power supply if the transformer is getting hot or some smoke is observed
or strange buzz sound is heard.
Fuse should be used either in power transformer or main socket to avoid accidentally
large current drawing.
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 P1, HA and HB without applying input signal. The voltage of
P1 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 P1, 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 P1 to attain best sound performance.
If you have any problem
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assembly,
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