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Version 1.32 

14 

Connect a wire from terminal B4 on the output transformers (this is the 8 ohm tap) , to 
points  X11  on  the  corresponding  PCBs  for  the  negative  feedback  connection. It  is  a 
good  idea  to  wire  the  right  PCB  first  as  this  is  further  away  and  the  wire  will  be 
longer. Now cut the wire for the left PCB to the same length as the right to give the 
same feedback path for each channel. 
 

Configuring The Output Transformer For PP Mode: 
 

Output  transformer  for  Edison  60  power  amplifier  kits.  Top  view  down  with  pins 
closest to you. PLEASE NOTE : New transformers have slightly different end frames 
so may need 2 extra holes drilling in the chassis to fit them properly! 

 

 

Figure 4. Output transformer in PP mode 
 

 

 

PLEASE  NOTE    -  NEW  TRANSFORMERS  NO  LONGER  HAVE  POSITION 
B2 – 2 OHM TAP – ONLY B4 = 8 OHM AND B3 = 4 OHM 
SEE ADDENDUM NOTES 

Содержание Edison 60

Страница 1: ...ing soldered This ensures that wires are not held on to terminals purely by solder alone and safeguards them against becoming loose 3 When wiring an audio amplifier it is a good idea to wire each chan...

Страница 2: ...ening Your Kit And Checking its Contents Please note that a mains lead is NOT supplied with this kit due to safety regulations in the country of its intended use You will need to purchase an I E C fus...

Страница 3: ...7 R8 R29 1 x 374R 2W resistor R25 1 x 15K resistor R17 7 x 1K resistors R9 R10 R11 R11b R12 R21 R22 1 x 261R resistor R28 3 x 576K resistors R2 R3 R26 2 x 220K resistors R4 R5 1 x 75K resistor R24 1 x...

Страница 4: ...e Two sets are needed for each kit ie one for each PCB each set contains 2 x 220uF 250V electrolytic capacitors C20 C21 2 X High value Watt resistors R50 R51 1 x 100 ohm 7 Watt resistor R52 2 x Blue P...

Страница 5: ...ion point or first tinning the wire When connecting a wire to a valve base pin it is recommended that enough insulation be removed so the wire can be wrapped around the pin to form a good mechanical j...

Страница 6: ...this is done the PCB will be set up for both PP and PSE and will not need to be changed Now go through the parts list and solder in the remaining resistors and capacitors Note when placing the electr...

Страница 7: ...he front panel facing you Note current output transformers now have three output pins instead of four The forth pin that was a 2 Ohm tap is not required and its removal has increased the frequency res...

Страница 8: ...rd using the three M3 stand offs and M3 screws There are three positions the board could go in the easiest for wiring being the middle position The capacitors should be at the rear as shown in the pic...

Страница 9: ...ove diagram Note the blue wire goes to the left and the brown to the right when viewed from the front of the amplifier Cable tie the four wires together to keep them tidy All a c wires should be twist...

Страница 10: ...r as this reduces hum A light twist aprox every 1 1 5cm should be fine Blue 0V White X15 on PSU Brown 120V Red Cut and Insulate Black X16 on PSU Blue 0V Brown Cut and Insulate Brown 120V Yellow Pair S...

Страница 11: ...pairs which are not used Mounting The Audio PCB In The Front Chassis Panel Before the Audio PCB s are fitted the octal valve bases for the EL34 power valves must be attached to the front chassis pane...

Страница 12: ...volume pot connects to point X9 on the right PCB and terminal 5 connects to point X9 on the left PCB Connect terminal 3 to input switch S2 terminal 4 and finally connect terminal 6 on the volume pot...

Страница 13: ...wires from the mains transformer to points X7 and X8 on the right PCB the polarity does not matter Now link points X7 and X8 on the right PCB to points X7 and X8 on the left PCB respectively the polar...

Страница 14: ...to the same length as the right to give the same feedback path for each channel Configuring The Output Transformer For PP Mode Output transformer for Edison 60 power amplifier kits Top view down with...

Страница 15: ...rmer terminal A2 Pin 3 on valve base V2 goes to pin A5 and pin 6 goes to terminal A4 The right PCB is connected the same way The amplifier is now connected in ultra linear mode For Triode mode connect...

Страница 16: ...inear mode For triode or pentode mode follow similar instructions for the PP transformer connections Wiring The Input Connectors And Switches Cut the length of screened cable into three equal sections...

Страница 17: ...case to the mains inlet The resistance between the earth pin of the mains plug and the chassis should be less than 0 5 ohms generally the resistance of the test wires 2 Turn the mains switch on and fi...

Страница 18: ...this should be approximately 460V 490V DC For Push Pull this should be approximately 460V DC Depending on mains voltage 2 The Cathode bias voltage pin 8 for each EL34 should be approximately 35V DC T...

Страница 19: ...replace the standard zinc pan pozi screws used to hold the valve tube bases to the chassis and also the 8 screws that are on the top stainless steel top plate The 8 screws that hold the valve tubes b...

Страница 20: ...rds then use that throughout your build to maintain sonic consistency and electrical stability Silver Night Format output transformer The silver Night output transformer designed for the Edison 60 pow...

Страница 21: ...r as to add a variable resistor in series with each 470R resistor 100R variable in series with 3k9 2W across the 470R R 419R to 519R to balance them all out and set them the same for each valves in ea...

Страница 22: ...sy and sound flat the 6N1Ps are low noise but depending on which valve is plugged in you get changes in audible hum all are in any event very low levels and totally ignoreable The best appear to be th...

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