EL34 SE Amplifier User Manual
Contents
1. EL34 SE Amplifier User Manual Analog Metric www analogmetric com sales analogmetric com Copyright 2009 All Rights Reserved EL34 SE Amplifier GAG INTRODUCTION This kit employs commonly used pentode EL34 vacuum tubes for the class A output amplifier with 6SN7 as input stage The 6SN7 tubes formation of two cascading stages which are configured in common cathode and cathode follower The output power can reach 10W for each channel A rectifier tube SAR4 is used for power rectification and then followed by a 10H 250mA choke for noise filtering www analogmetric com EL34 SE Amplifier GAG FEATURES Two EL34 two 6SN7 and one 5AR4 tubes The first two stages use triodes of 6SN7 which are configured as common cathode and cathode follower The output stage uses one EL34 tube configured as class A amplifier with single end output Output power can reach 10W for each channel Built in rectifier and LC noise filtering circuitry Symmetrical layout design in signal paths for both channels Dedicated ground and power rails layout design Two large reservoir decoupling capacitors for power rails Power requirements two 260V AC 100mA one 5V 2A and two 6 3V AC 1 5A PCB dimension 218mm W x 132mm L PCB thickness 2 4mm double layer 20z copper www analogmetric com EL34 SE Amplifier EAG PRECAUTIONS Do not use any body parts to touch the metal parts of the kit after power u2. p or power off since 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 Solder all the components according to the schematic and part list Notice to the direction of the electrolytic capacitors C1 C4 C8 C11 and C12 There is no direction of the thin film capacitors Either use rectifier tube V5 or diode bridge DB1 Left unsolder for the capacitor C13 Short the L1 if not use the 10H 250mA choke Apply 6 3V AC or DC to J2 and J3 5V AC to P2 two 260V AC to PI Measure the B voltage at P3 which should be 350V DC If the B voltage is correct turn off the power supply until all HV capacitors are discharged which may takes few minutes Short the B1 and B of P3 Enjoy it If you have any problem in assembly please contact us by email to tech analogmetric com www analogmetric com
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