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4 How to get the best out of your amplifier
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Do not leave the amplifier switched on all the time. This is not necessary
. Use “Standby” if not required
•
Do not switch off and on without a short rest of 60 seconds
•
Do not adjust the output valve grid bias unless you know how, see section 6 below
•
Do not operate the amplifier without loudspeakers connected
•
Do not use valves other than listed as there could be danger of shock or damage to the amplifier
•
Do check the bias regularly at least once a month for best performance.
•
Make sure the loudspeakers are in phase.
•
Use the best possible source material.
•
Using larger, more efficient well-designed speakers will give a huge benefit in overall sound.
What is safe maximum volume?
The meter is set to read 100% when both
channels reach maximum power (one channel
70%). As music is generally consists of fast
“transients” which the meter will not show, meter
indications of around 70% will approximate the
maximum undistorted power. Should this not be
enough for your loudspeakers, this may indicate
that a more powerful amplifier is required.
Leaving the amplifier switched on
The Stereo 300 will start working within 60
seconds and will be fully warmed up in about ten
minutes. Should the amplifier not be needed for a
short time it may be left in the “standby mode”,
this will save power.
Do not leave the amplifier switched on 24/7. Your
valves will be worn out in approximately nine
months!
Never leave the amplifier switched on
when unattended. Always switch off when not
in use.
Standby Switch.
This switch has two functions:
1. Ideally allow the amplifier to warm up before
applying power to the 300Bs/6SN7s valves. Also
power saving, when not needed for a short time
the power consumption is only 50w, with the
valves remaining hot and ready for use.
‘Burning in’
A new amplifier will take approximately 6 months
of regular use to be reach its optimum sound. This
is a slow process and will continue for several
years as it involves all the various components
settling within the amplifier as well as the valves.
Upgrading Valves!
Good quality new valves will generally sound
better, have good performance and reliability. It is
important to have the valves “matched” in pairs or
quads. This includes the 6SN7/CV181s having
both halves matched.
The valves supplied with this amplifier have been
tested, matched and aged for the best
performance. New valves need testing, grading
and matching. Ideally they will have been tested
and aged in a ST300 to ensure best performance.
You are welcome to contact us for this service.
Cabinet Care
To remove dust use a small paint brush.
Other marks can usually be removed with a damp
cloth and dry with a duster.
Never use anything wet on the amplifier, and
always clean with the power disconnected.
