andrews Para-Dyne 20, Руководство по эксплуатации

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8
Rear Panel
1. FUSES –
Always use correctly rated fuses or severe damage to the amp may
occur. Refer to the rear panel for fuse ratings. Always unplug the amp before
replacing any fuses. When installing a new HV fuse, first insert it into the cap of the
fuse holder, then while holding only the cap, insert the fuse into the holder, push in
and turn clockwise to lock the cap and fuse in place. The main AC fuse is located
in the AC cord jack. Use a small screwdriver to remove the fuse holder.
2. TRIODE/PENTODE SWITCH –
In the PENTODE position, the amp will
operate normally with full output power. In the TRIODE mode, the output power will
be reduced roughly by half. This will allow the volume controls be set higher for a
more “cranked up” tone while slightly reducing the actual volume of the amp.
Always be sure to stop playing before switching. Operating this switch while
playing could cause damage to the amp or tubes.
3. BIAS TEST POINTS AND ADJUSTMENT CONTROL
– These are
provided to simplify measurement and adjustment of the idle current of the output
tubes. Bias adjustment is necessary whenever the output tubes are replaced.
See page 10 for bias adjustment instructions and precautions. The adjustment
control is located on the underside of the chassis near the test points.
4. SPEAKER JACKS –
Always use the jack labeled MAIN first. If an additional
cabinet is to be used, meaning that two cabinets will be connected at the same
time, connect the second cabinet to the jack labeled EXT. Make sure any speakers
you connect can handle more than the output power of the amp. Always set the
impedance selector switch to match the correct speaker load. See chart below.
NEVER OPERATE THE AMPLIFIER WITHOUT A SPEAKER CONNECTED OR
DAMAGE MAY OCCUR AND THE WARRANTY WILL BE VOID.
Speaker “Break-In” – New speaker cones may be tight and stiff. This results in a
brighter tone with less bass and may even be considered “harsh” at times. By the
time your speaker has been played hard for 20 to 30 hours or more, its true
character and tone will become apparent. Until your speaker is fully broken-in, you
may find that you can achieve better tone by reducing the TREBLE control slightly.