Manley MOVING COIL & MOVING MAGNET PHONOGRAPH PREAMPILFIER - Manual (Page 11)

TROUBLESHOOTING
The CHINOOK's system architecture is designed with a variety of features so as to allow flexibility in
accommodating as many cartridges and as much downstream gear as possible. Access to these
capabilities rest on the assumption that all CHINOOK systems are functioning properly. If trouble is
encountered, please review the following short list of symptoms and corrective remedies before
contacting your dealer or Manley Laboratories service.
Symptom Possible Cause Corrective Action
No lights, power Bad mains fuse Replace fuse.
Bad or unplugged power Check outlets.
cable
AC outlet not energized
Lights on, no output Open 6922 filament Check for glowing
after turn on delay 6922 Filament
Replace Tube
Hum heard when Turntable / tonearm ground wire Attach ground wire from not
connected. turntable / tonearm to
Chinook Input
chassis ground terminal
on rear of CHINOOK.
Turntable cartridge close to hum Keep unit away from
fields. power transformers,
motors, etc.
Ground loop between CHINOOK Break ground connection
and turntable. of one or two of the
three system elements.
Experimentation may be
necessary.
Never operate any
equipment with an AC
“ground lifter.”
Remarks on hum pick-up: Please be aware that the CHINOOK can develop voltage amplification factors as
high as 1,000 times, or 60 dB at the 50-60 Hz power line “hum” frequencies. It is of the utmost
importance that cables handling the tiny signals from the phono cartridges be of high quality, with good
screening and connection properties, if the single-ended signal is to have any chance of being received
by the preamp reasonably free from hum and noise intrusions. This is especially true for moving coil
pickups. Please use the shortest practical interconnects and carefully route these away from all possible
electrical or magnetic hum or interference sources.
Chinook Owners Manual 9
MANLEY
LABORATORIES, INC.