MANLEY 75 / 150 SE / PP 807 TRIODE MONOBLOCK
Amplifier Overhead View
A
B
C D
E
F
I
K
G
L
J
A
RCA Input Jack
B
Speaker Terminals
C
B PLUS FUSE - Replace only with same type and value (MDL 1.5)
D
Mains fuse - Replace only with same type and value
E
IEC Mains socket
F
Output Transformer
G
Power Transformer
H
Power Tube 807 s
I
Input Tube 5751
J
Driver Tube 7044
K
Single-Ended / Push- Pull Switch
L
Power Switch
M
Bias Adjustment Trimmers (each 807 has a trim and test point numbered)
N
Bias Test Points (Black test point is Ground)
REPLACING FUSES & LAMPS
The fuses are accessable without removing any panels. Be sure the IEC AC power cable is
removed before checking the Mains Fuse. Often a bad fuse will look blackened internally but
occasionally will look OK. Replace only with the same type and rating ! For 100 or 120 volt countries
the fuse should be a 10 AMP SLO-BLO. For 220 or 240 volt countries it should be 5 AMP SLO-BLO.
If a new fuse blows then it is likely there is another problem. Remove the 807s and try again. If the
indicator lights, then a tube is bad. At least one of them is the problem.If the fuse blew again - The
amplifier needs to be repaired by a competent technician or the factory.
Before removing the B+ Fuse let the power supply fully discharge - this will take at least 1
minute. The cap is removed with a proper sized screwdriver and 1/4 turn anti-clockwise while gently
pressing down.The B+ Fuse we use is ceramic and not able to be visually checked - a VOM meter is
needed. The symtom will be - lit indicators and glowing tubes but no sound.
The indicator is a fuse style lamp 1.25" X .25", 8 volt, 0.3 amp. The bottom must be removed
to access the lamp. Again, wait until the supply discharges.
BIAS ADJUSTMENT TRIMMERS
See the next page for full details - Read the voltage between the black test point and
each of the numbered red points. If the reading is not 0.340 volts or 340 mV then adjust the
corresponding numbered trimmer.
H
8
H
7
H
6
H
5
H
4
H
3
H
2
H
1
1 2 3 4 5 6 7 8
1 2 3 4 N 5 6 7 8
M
