WEAK, DULL OR DISTORTED SOUND.
Change PP3 / 6F22 9v battery for new Alkali or
Lithium. Avoid Zinc Carbon or rechargeable PP3’s,
batteries leaking or those metered at less than 8
volts. Check batteries in any connected devices.
INTERFERENCE ON AMPLIFIER e.g. Hum/noise
etc.
Check that instrument jack lead is of good quality and
condition, re-solder jack plug terminals, meter for
leakage between tip and earth.
Check Earth has not been disconnected in mains
power plug connections.
Change cable signal path to mixer / amplifier to avoid
earth loops or try earth lift switch, e.g. as offered on
HEADWAY EDB-1 Pre-amplifier.
Turn off phantom power to Pickup system unless
wired to accept it at correct voltage.
Take Passive Di Box out of chain of devices.
Use mains filters and surge filters on all mains
electrical inputs.
Access mains via different electrical ring main in
venue.
Turn off other electrical / electronic devices.
Connect tail pieces and / or strings to earth / ground
via jack.
