Octave V 70 Class A, Owner'S Manual

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11. TROUBLESHOOTING
 Possible cause: induction
Another possible cause of hum could be the stray field of a transformer generating interference in a
device or cable. You can easily diagnose this problem by switching off the problem component.
To fix the problem
To reduce this kind of interference, move the transformer/component or the affected
component/cable to a different location.
The transformer in the V 70 Class A will not generate interference, as it is electromagnetically
shielded and has a very low stray field.
 "Phase" does not cause noise and hum
The mains polarity of the components in your system has no effect on noise and hum. That is a
common fallacy. Swapping positive and negative in your mains plug will not make any difference to
an earth loop. If it does, there is a fault with that component and you should not be using it.
Switching interference
Older fridges and 12V halogen lamps can produce strong radio interference when they turn on and
off. Depending on the wiring in your home, this can result in clicks and pops in your loudspeakers.
To fix the problem
Modern domestic mains systems with a separate protective earth (PE) will normally suppress this
interference. If you experience this type of switching interference, you either have a poor protective
earth connection in your home or else your house does not use a PE system. In the latter case,
you may not be able to eliminate switching interference entirely. In any event, the use of mains
filters (in front of the device responsible for the problem) is certainly recommended.
Channels are not balanced
Level differences can have a variety of causes, although tubes are unlikely to be one of these.
1. The acoustics of the listening room may be affecting what you hear.
2. One of the drivers in your loudspeakers may be faulty.
3. There may be a faulty cable in your system
To fix the problem
You can trace the cause of this kind of problem by swapping speakers, cables, etc.