DECWARE Zen Triode Amplifier
Model SE84B
KIT ASSEMBLY INSTRUCTIONS

TESTING

 

MODEL SE84B

  position 1 position 2
A 407 Volts 406 Volts
B 331 Volts 330 Volts
C 310 Volts 298 Volts
D 284 Volts 260 Volts
E 207 Volts 143 Volts

Position 1 of this switch causes the bias resistor to read around 4.6 Volts when read on pin 3 or pin 8 of the 6N1P.

Position 2 of this switch causes the bias resistor to read around 2.6 Volts when read on pin 3 or pin 8 of the 6N1P


SV83 OUTPUT TUBE SOCKETS PIN 3 9.6 to 10.6 Volts
  PIN 7 318 Volts
  PIN 9 312 Volts
6N1P INPUT TUBE SOCKET PIN 3 2.4 / 4.6 Volts
  PIN 8 2.4 / 4.6 Volts

LAYOUT SE84B

 

 

MODEL SE84C

  position 1 position 2
A 407 Volts 406 Volts
B 331 Volts 330 Volts
C 310 Volts 298 Volts
D 284 Volts 260 Volts
E 207 Volts 143 Volts

Position 1 of this switch causes the bias resistor to read around 4.6 Volts when read on pin 3 or pin 8 of the 6N1P.

Position 2 of this switch causes the bias resistor to read around 2.6 Volts when read on pin 3 or pin 8 of the 6N1P


SV83 OUTPUT TUBE SOCKETS PIN 3 9.6 to 10.6 Volts
  PIN 7 318 Volts
  PIN 9 312 Volts
6N1P INPUT TUBE SOCKET PIN 3 2.4 / 4.6 Volts
  PIN 8 2.4 / 4.6 Volts

NOTE: The working voltages of SE84B and SE84C are virtually the same.

PARTIAL LAYOUT SE84C

 

MODEL SE84CS

  position 1 position 2
A 365 Volts 365 Volts
B 284 Volts 283 Volts
C 262 Volts 250 Volts
D 246 Volts 225 Volts
E 169 Volts 108 Volts

Position 1 of this switch causes the bias resistor to read around 4.3 Volts when read on pin 3 or pin 8 of the 6N1P.

Position 2 of this switch causes the bias resistor to read around 2.3 Volts when read on pin 3 or pin 8 of the 6N1P


SV83 OUTPUT TUBE SOCKETS PIN 3 7.6 to 8.6 Volts
  PIN 7 273 Volts
  PIN 9 263 Volts
6N1P INPUT TUBE SOCKET PIN 3 2.3 / 4.3 Volts
  PIN 8 2.3 / 4.3 Volts

LAYOUT SE84CS

 


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NOTES:

To test your amplifier before trying to play it, the first thing is to see where the voltages land. Above are schematics of the various filter sections of the power supply. The yellow wire with the stripe coming from the power transformer is the rectified B+ that connects to the first section of the filter network. This is point A. Take your meter and connect the ground to the ground wire in the chassis and read the voltages at the illustrated points.

To test these voltages, you should have the volume pot turned all the way off, and no load hooked to the amplifier. Also the position on the input stage bias switch will change the voltages so we will list both values for each point.

 

(C) 1998 by High Fielity Engineering Co.
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