Engl E670 - Front Panel

43
Tube Map:
Output
Transformer
Power
transformer
V 1
50/100W
V 5
Input
& T.D.
circuit
E670 chassis
as viewed
from above
Front panel
V 6
2.stage
& Lead
driver
V 7
3.stage
& Classic
enhancer
V 8
FX buffer
& P.A.
driver
V 9
phase
shift
converter
V 2
100W
V 3
100W
V 4
50/100W
bulb:
6,3V - 200mA
bulb:
6,3V - 200mA
bulb:
6,3V - 200mA
bulb:
6,3V - 200mA
Reverb
spring
System for BIAS Adjustment
Bias adjustor viewed from
the front of the chassis:
95 96 97 98
99 100 101
102
103 104
EL34 6L6GC
BIAS
CHECK
V1
HIGH
BIAS TUBE
TYPE SELECT
BIAS
ADJUST
BIAS FINE
ADJ.
EL346L6GC
Bias adjustor viewed from
the back of the chassis:
BIAS
CHECK
V2
BIAS
CHECK
V3
BIAS
CHECK
V4
O.K.LOW
Use buttons to ascertain
each tube's bias;
Set bias range using
Bias Tube Select button
Tune using BIAS Adjust
and BIAS Fine Adjust.
Yellow LED: BIAS Lo
(too low)
Green LED: BIAS in Range
(Ok)
Red LED: BIAS Hi
(too high)
page:
31 - 33
Tube replacement report:
1. Replaced on: _ _ _ _ _ _ _ 20 _ _ _ Replaced by: _ _ _ _ _ _ _ _ _ _ _ _ _ _
Replaced tubes: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Reason: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
2. Replaced on: _ _ _ _ _ _ _ 20 _ _ _ Replaced by: _ _ _ _ _ _ _ _ _ _ _ _ _ _
Replaced tubes: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Reason: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
3. Replaced on: _ _ _ _ _ _ _ 20 _ _ _ Replaced by: _ _ _ _ _ _ _ _ _ _ _ _ _ _
Replaced tubes: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Reason: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _