6N3 SRPP Tube Preamplifier User Manual
Contents
1. 6SN3 SRPP Tube Preamplifier User Manual ANALOG METRIC sales analogmetric com Copyright 2009 All Rights Reserved 6SN3 SRPP TUBE PREAMPLIFIER USER MANUAL Analog Metric Metric INTRODUCTION Two dual triodes 6SN7 vacuum tubes are used for amplification in SRPP configuration The filaments are supplied by a low dropout voltage regulator LM1085 MKP filem capacitors are used for signal paths Symmetric layout is designed with matching impedances between two signal paths and minimum parasitic so it provides high linearity fast responses and low signal distortion Also this board has built in full wave rectification circuit and regulation circuit FEATURES Two 6N3 5670 vacuum tubes are configured in SRPP 6Z4 uses as rectifier tube for high voltage supply A LM1085 IC is employed as regulator for tube filament supply Voltage Gain 20dB MKP film capacitors are used for signal paths Spaces are left for large reservoir decoupling capacitors www analogmetric com Page 2 6SN3 SRPP TUBE PREAMPLIFIER USER MANUAL Analog Metric Metric e Symmetric layout design between two channels e Dedicated power and ground railings Shortest signal paths with minimum parasitic e Power requirement two 200V AC 100mA and two 6 3V AC 0 5A e PCB dimension 177mm x 107mm 2 4mm thickness and 20z copper PRECAUTIONS Do not use any body parts to touch the metal parts of the kit after power up or power off sinc2. e the high voltage capacitors may not fully discharge It may cause serious electric shock Use a power transformer with fuse 1 3A socket to limit the supply current in case of short circuit or incorrect assembly Double check the assembled components with the schematics Do not attempt the measure the voltage by multimeter with hand after power up The probes of the multimeter should be mounted by some stands to the points of the measurement before switching on the power supply Turn off the power supply if you observe any smokes or hear strange sound coming out from the transformer or board If there is short circuit the transformer will be getting very hot shortly PROCEDURES 1 4 Solder all the components according to the schematic BOM list and the photo Notice to the polarity of the capacitors C1 C4 and LED D1 and D2 There is no polarity of the thin film capacitors so it can place in any directions Connector power supply to the board according to the following photo It requires two 200V AC 100m lt A for J1 and two 6 3V AC 0 5A for J2 and J3 Turn on the power supply and then check the voltage at PIN 1 of tubes VI and V2 6 3V DC and the voltage at R2 280V DC If everything work property the LED will be led up and also the tubes Enjoy it www analogmetric com Page 3 6SN3 SRPP TUBE PREAMPLIFIER USER MANUAL Analog Metric Metric SAL e pe MDOP iO L Ds dN 84 ge 4 20 LA P Lu ae z w
3. ww analogmetric com Page 4 6SN3 SRPP TUBE PREAMPLIFIER USER MANUAL Analog Metric Metric TESTING WAVEFORMS LA us ARE 3 60V 24 Aug 10 1807 13 3999kH 24 Aug 10 1807 19 3999kHz If you have any problem in assembly please contact us by email to tech analogmetric com www analogmetric com Page 5
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