Owner`s manual

120 VAC
3 amp fuse
YEL
YEL
RED
RED
RED/YEL
4
6
2
8
5U4
4
5
4
5
4,
GRN
GRN
B +
6N1P
or 6922
SV83 SV83
1K 5 0 W DALE
5
6.8 K 1 watt
3.3uf 400v
Sol en poly
10K
10K
to 47K plate
yel/blk
7
7
3
3
100 ohm /25 Watt DALE
9
9
2
2
330 K
330 K
.01 WIMA FKP-1 600V
47 K carbon
47 K carbon
2 . 7 K
2 . 7 K
3
8
1
6
2
7
white
white
red
red
Common
Common
6 ohm
6 ohm
REAR INPUT
REAR INPUT
100 K
100 K
INPUT GAIN CONTROL
1 . 5 K
1 . 5 K
1K 2 W
6N1P or 6922
SV83
SV83
1K 2 W
To power supply
US transformer shown
40 uf 450 volt
3.3uf 400v
Solen pol y
to 47K plate
40 uf 450 volt
2 ~ 20 uf 250 volt
B+
B+
330 ohm
330 ohm
.01 WIMA FKP-1 600V
YEL
YEL
RED
RED
RED/WHITE
GRN
GRN
yel /blk
1
2
3
4
5
6
240 VAC 50/60 cycle
BLK
WHT
WHT/BLK
BRN
NOTE: We recommend wiring the primary for 240 volts even if your
voltage is 220 or 230. Use a 3 amp fuse.
For Japan 100 volt connect 1 to 4 and 2 to 5
Use 1,4 and 2,5 for line connection.
ZEN TRIODE STEREO AMPLIFIER
MODEL SE84C-S
DECWARE
High Fidelity Engineering Co.
USA
www.decware.com
UPGRADED
AREAS
The areas marked in yellow represent the upgraded parts between a stock SE84C and this SELECT model (SE84C-S)
1K
1K
FRONT INPUT
FRO NT INPUT
This schematic can be used to construct a Zen Triode Amplifier model SE84CS
or it can be used to upgrade a model SE84C to a model SE84CS. The yellow
areas indicate the upgraded parts that differentiate the two.
To test your amplifier after upgrading or assembly, connect speakers to the
outputs and turn the input volume control all the way down. Install all the tubes
and turn the unit on.
Your B+ voltage should be between 320 ~ 350 vdc. The bias voltage on your
output tubes (pin 3) should be between 9.5 ~ 12 vdc when referenced to ground.
If a 5Y3GT rectifier is used, the output tubes cathode resistor should be changed
from 100 ohms to 150 ohms.
AC ripple can be measured on the outputs and should be less than 2 millivolts.
The silver/teflon wire is used to connect the output tubes cathode (pin 3) to the
cathode resistor (100 ohm 25w ), and should be run in equal lengths from each
tube.
The outputs on this amp float with no reference to ground - do not connect the
negative to ground or the chassis. If you do you won't be able to SERIES the
outputs when bridging the amp for mono use.
This amp is built with a single point ground, located on one of power transformer
mounting bolts. The silver litz wire is used to carry the ground buss for the entire
circuit. Do not use the chassis for ground.
For safety, be sure to use the ground on your power cord, connecting it to the
single ground point as everything else.
GRN/YEL