Manley Labs 75/150 SE/PP 807 MONOBLOCK MANLEY 75 / 150 SE / PP 807 TRIODE MONOBLOCK, F H Hh

MANLEY 75 / 150 SE / PP 807 TRIODE MONOBLOCK

F

H 2

HH

13

A B C D E

1 2 3 4	M
	5 6 7 8
H	H
4	5

J

I

G

H 7

HH

68

1 2 3

4 N 5 6 7 8

K

Amplifier Overhead View

L

ARCA Input Jack

BSpeaker Terminals

CB PLUS FUSE - Replace only with same type and value (MDL 1.5)

DMains fuse - Replace only with same type and value

EIEC Mains socket

FOutput Transformer

GPower Transformer

HPower Tube 807 s

IInput Tube 5751

JDriver Tube 7044

KSingle-Ended / Push- Pull Switch

LPower Switch

MBias Adjustment Trimmers (each 807 has a trim and test point numbered)

NBias 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.