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10 Watt Power Amplifier
   
   
Transistors:
Tr1 BCY70 (or BC 182L or BC212L or BC214L)
Tr2/3/4 BFY50/51
Tr5 BFX88
Tr6/7 2N3055
 
   
Risk of instability if no input connected; when testing, connect R (about 3k3).  
Needs well smoothed power supply of about 20 to 30 volts. Peak power is well over 10 Watts.  
The table below shows the approximate voltages to be expected when using a 24V supply and with the variable resistor set to give a current of about 40mA in the output stage.  
   
Test point Approximate voltage
Tr1(e) 12.5
Tr1(c) 0.65
Tr2(c) 12.5
Tr3(c) 14.4
Tr4(e) 13.7
Tr5(e) 13.1
Tr5(c) 0.6
Tr7(c) 13.1
 
   
For a method of making simple printed circuit boards, like this one, see here.  
   
Printed circuit board, copper side  
   
 
   
Printed circuit board, component side  
   
 
   
Just the resistor values are shown... it is assumed that you will be able to use the circuit diagram to identify the capacitors!  
   
The power transistors, Tr 6 and Tr 7, are not on the pcb itself but mounted separately on some sort of heat sink.  
   
 The 10W amplifier is taken from "Transistor Audio and Radio Circuits" published by Mullard (I think...)  
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