work is done correctly and that there is knowledge of what is going on out there with
each amp. To any second owners or more, there is no warranty coverage nor is a
warranty transferable. (This policy is no different then before). Of course we at Diezel are
happy to serve people who purchase their amplifier on the used market should your amp
ever need servicing. Parts and labor charges will occur for our work on your amplifier as
usual.
If you purchased your amp before 1/20/2009 you are categorized under the same
guidelines as when you purchased your amp (Lifetime warranty for the original owner, 1
year transferrable warranty).
Chapter 2
Setting up your VH4
2.1 Power connection/Mains
Before connecting to a grounded power outlet, make sure the power and standby
switches are in the off ( facing down) position. Never turn this amp on without speakers
connected. The VH4S requires a speaker to be connected to side A and B of the amplifier
output jacks. Obey impedance requirements! ( see 3.4) The VH4 S cannot be operated in
“bridged mono” mode.
Once your VH4 is connected to power and the speakers are plugged in correctly, then we
can get started!
2.1.2 Power/Warmup/Standby Off
First turn the Power switch to on ( facing up). The indicator will light up. This starts the
tube heating process. After about 40 seconds, the tubes have sufficiently heated for
normal operation. Your VH4 is now ready for operation and the standby switch can be
turned to “run” (also facing up). Premature activation of the standby switch will lead to
unnecessary tube stress and subsequent reduction of the power tube’s life span.
2.1.3 To protect and serve
Tubes are electronic components that only function with vacuum intact and under very
high operating temperatures. Each tube has one or more heating filaments, much like a
light bulb. These filaments heat up the Anode of the tube. If you switch the standby
switch before these Anodes have reached their operating temperature then the Anode
surfaces are not heated evenly yet; the “operating temperature” of the tube is not
reached yet. This causes undue stress on the tubes and their related components inside
the amp. One should therefore always give the amp it’s much needed warmup time, even
if musical inspiration hits with full force.
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