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located in the tray before replacing it with the correct type and value for your
territory or temporary home, (on tour for example).
POWER ON Switch
This switches the mains power ON for the VC35. Please ensure the front toggle
switch is in the ‘PREHEAT’ centre position before powering up.
HT FUSE
The HT or ‘High Tension’ fuse protects the high voltage for the valve supply. If this
fuse blows, the first step is to replace it with an identical T500mA 20x5mm fuse.
The HT fuse may
sometimes blow due to ‘flash
-
over’ inside an output valve. This is
where during the manufacturing process, not all of the gas is removed from the
glass envelope and the ‘getter’ inside the valve, usually made from barium or
magnesium oxide, will burn or evaporate these remaining gasses resulting in the
common silvered internal surface of the valve. This process, which is more likely to
happen with new equipment, creates a momentary short-circuit which draws high
current and can blow the HT fuse. It will rarely cause any damage so just replacing
the fuse is sufficient to get the amp running normally again.
However, if the HT fuse blows repeatedly, (more than 3 times for example), it may
indicate a serious valve failure where internal parts of a valve are shorted and in
this case the amplifier needs to be checked by a qualified engineer to assess the
problem.
VERY IMPORTANT WARNINGS!!
In certain countries, (specifically, Nordic countries), is it totally forbidden to open
up any electronic equipment or to work on them at all unless you are a fully
qualified and approved technician. Please check the laws in your country and do
not attempt to change valves/tubes or re-bias the amplifier if the law forbids this.
In this case, please take you’re your amplifier
to a qualified and approved
electronics technician.
In certain countries it is also totally forbidden to keep or place any liquids on top of
the amplifier, (e.g. beer, water bottles, glass, drinks etc). This may cause serious
electric shocks and/or dangerous situations.
Also, it is totally forbidden to use the amp in the event of rain splatters/water
drops getting into or onto the amp.
Even if it is not a law in your country, you should never allow liquids near the
amplifier or attempt to use the amplifier if it has been subjected to any moisture as
this could result in a fatal electric shock.
