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1. DESCRIPTION OF THE V70
Our protection system incorporates an independent circuit that monitors
the power output of the four power tubes. It switches the power supply
off when the maximum permissible values are exceeded. The red OFF
LED illuminates to show you when the protection has been activated.
This can happen for a number of reasons - for example, if the speaker
outputs are short circuited or if the power amplifier is overdriven. The
protection system protects the amplifier and the tubes from overload.
The V 70, like all Octave amplifiers, is thus fully protected against the
possibility of serious damage that often affects other valve amplifiers
when overdriven.
Our system - soft start and protection circuit - rules out any possibility of
'user error'.
Owners of tube amplifiers usually receive lots of advice like: Never op-
erate without the speakers connected; Follow the switch-on sequence
exactly; Switch valve amplifiers on and off as little as possible, etc. This
is certainly important advice for many amplifier brands, but is not neces-
sary with the V 70. The built-in control system automatically takes care
of this.
PROTECTION
SYSTEM
Another extremely useful feature is the bias (idle current) measuring
facility.
Unlike the simpler class-A power amplifier type, AB amplifiers require
adjustment of the negative grid bias to optimize idle current for the po-
wer tubes. The setting can change as the tubes age and it must also be
adjusted whenever tubes are replaced. Normally, this requires test e-
quipment and a knowledge of what and where to measure.
Setting the bias used to be a job for an electronics technician, but with
the V 70, you can check and adjust the bias without any tools while the
amp is on.
This adjustment has a huge influence on the sound quality and perform-
ance characteristics of an amplifier (see diagram 1 under "Specifica-
tion").
BIAS
All of these features make the V 70 a unique product in its class and a
true, state-of-the-art design. The V70 benefits from the know-how and
technologies that make our top of the range amplifiers, the Jubilee Line,
reference class products.
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