Palmer FAB5 Manual De Usuario página 13

A correctly set bias current and heating symmetry ("hum balance") extend
service life. In case of increased tube wear, these settings should be
checked.
HERE ARE A FEW MORE BASIC RULES YOU CAN FOLLOW TO EXTEND THE SERVICE LIFE
OF YOUR AMP SIGNIFICANTLY:
— Condensation may form inside the equipment if it is suddenly moved from a
cold place to a warm one. This is especially important where tube equip-
ment is concerned. Do not turn the equipment on until it has reached room
temperature.
— Always ensure that any peripheral devices and equipment are technically
flawless!
— Where the FAB5 is concerned, open ventilation slits for unimpeded air
circulation are vitally important.
— Extreme heat and penetration by dust and especially moisture should al-
ways be avoided.
— Always comply precisely with the specifications of additional devices.
Never operate the FAB5 when it is connected to speaker cabinets with an
impedance (ohm rating) that is too low. Never operate the device unless
it is connected to a speaker or an appropriate load. Never connect equip-
ment with a level that is too high (e.g., power amps) to the amp.
— Always check the local mains voltage before connecting the device. In
case of doubt, contact the stage technician, maintenance supervisor, or
the like.
— Do not make "do-it-yourself" repairs in the event of trouble! Even re-
placement of internal fuses is best left to an experienced technician.
6) TROUBLESHOOTING
THE FAB5 WILL NOT TURN ON:
• There is no mains voltage present: verify that the power cord is connect-
ed correctly!
• The mains fuse is defective: replace the mains fuse with a fuse of the
same type with the same rating. If the defect occurs again, you should
contact a PALMER dealer.
• The local mains voltage does not match the operating voltage of the am-
plifier.
THE FAB5 IS CONNECTED CORRECTLY, BUT NO SOUND IS AUDIBLE:
• The guitar VOLUME control is turned all the way down.
• The volume on the amp is turned all the way down!
• The anode fuse has blown. You should contact a PALMER dealer.
THE AMP MAKES "RINGING" NOISES WHEN PLAYING AND TENDS TO FEED BACK
• One or more tubes are microphonic. Have the tubes tested by a technician
and, if necessary, replaced with new tubes of the same type with the same
characteristic.
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