Manley 175 WATT MONOBLOCK AMPLIFIER User Manual
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6350
12AT7
INPUT
RCA
OUTPUT B+ MAINS
FUSES
IEC MAINS
IN
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4 GND
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BIAS READOUT POINTS
Amplifier Overhead View
Bias Adjustment Points:
Tube Location
OUTPUT TUBES: 8 X 5881
The 5881 is a Russian military up-rated 6L6 type. This has been proven to be the rugged and reliable of
the 6L6 types and we strongly emphasize that only the 5881 should be used in this amplifier. The MANLEY 175
WATT MONOBLOCK has been thouroughly optimised around this tube.
DRIVER TUBE: 6350
The 6350 is an American military uprated version of the 12BH7A but WITH ONE IMPORTANT
DIFFERENCE!!! The 6350 has a differnt pinout to the 12BH7A. Thus ONLY the 6350 can be used in this circuit.
THERE IS NO OTHER SUBSTITUTE!
INPUT TUBE: 12AT7WA
The 12AT7WA has several equivalent numbers, (12AT7, 12AT7A, 6201, ECC81, etc.) Any of these
types may be used. We have selected this 12AT7WA very carefully for noise, microphonics, and constancy.
Replacement tubes of premium quality are always available from MANLEY LABORATORIES.