2.1.4 Optimum Operating temperature
It will take a little more time after warmup until everything inside the amp is working in
sync and to it’s fullest potential. A trained ear will notice a slightly warmer tone and better
complexity in tone after playing the amp for a short while. It’s like warming up before
running a marathon. Get it?
2.2.1 Factory Setting
The Amplifier is set to 110V/60Hz for use in the United States. Keep the amplifier on this
setting for use in US, and check it after servicing the amp of after receiving the amplifier
from third parties. The operating voltage is indicated by white letters inside a little window
above the power input jack.
2.2.2 Traveling Abroad
If traveling to countries outside the US, then always check their local voltage before
operating the VH4. Mismatched voltages can and most likely will destroy your amplifier.
Should you encounter voltages and frequencies other than those indicated, then a
transformer must be used between the power socket and the VH4. This transformer must
be able to transform the voltage and frequency to one of the indicated settings. The
transformer must also be able to handle the necessary amperage for your VH4.
2.3 Safety fuses
2.3.1 Main Fuse
The Main Fuse is situated inside a little drawer which is part of the power input jack. This
sliding fuse holder also hides a spare fuse. The fuse values depend on the operating
voltage in your country. For 110V, the fuse is to be a 8A slow blow, for 220V operation,
the fuse must be 4 A slow blow. It is crucially important to use the specified fuse values
only.
2.3.2 Tube Fault
Each power amp tube utilizes it’s own tube fault system, consisting of a tube fault fuse
(250mA slow blow) and a tube fault indicator ( small red warning light). Ideally, a
defective tube will blow it’s fuse and illuminate the tube fault indicator. This is very very
cool for several reasons: The tube fault system will not shut down the entire amp and
leave you or us embarrassed in the midst of a heated set. The remaining tubes will
continue operation and allow you to finish your song, or the set, or the show. Output
power, volume and tone might change some, but you will remain being heard. The
indicator shows which tube and fuse just gave up, and with a little effort and a spare tube
and fuse, you are back on stage with great tone and a smirk on your face.
We do recommend you take a look at the other tubes and replace them as soon as
possible with a matched set, followed by careful biasing.
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