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CONNECTING YOUR AMPLIFIER
IMPORTANT: PLUG IN THE TUBES.
We do not ship the amps with the output tubes inserted to prevent breakage. Before plugging
in anything, locate the 2 tubes (KT-90s or 6550s) packed with the amp and insert them in the two
large tube sockets. The sockets are marked 1 and 2, the tubes are marked 1 and 2 - Put 1 in 1 and 2 in
2. This configuration is how the amps were tested and adjusted. Otherwise you will have to re-bias.
You should remove these little labels from the tubes and amp chassis as they are not needed now and
they may bake on permanently if the amp is run for a reasonable amount of time with them on.
Verify that the smaller tubes are sitting straight in their sockets.
Setting up your amplifier is rather easy.
1. Connect all source components (turntable, CD, Tuner, Tape DAT, etc.) to your preampli-
fier.
2. Connect the interconnects from the output of the preamplifier or switching center to the
RCA input on the top rear of the amplifier.
3. Connect the hot or "+" speaker cable to the red binding post and the common or "-"
speaker cable to the black binding post (See diagram 2). Ensure that the other end of the
cable is connected correctly to the speaker. Tighten the binding posts by hand. If you
use a nut-driver (3/8") do not over-tighten the posts or you may breaak the connection
inside the amplifier.
4. Insure that the "mains" switch on the front panel is in the "off" or "0" position.
5. Turn on Preamplifier and any source components you plan to use.
6. Plug amplifier into wall outlet.
7. Turn on the amplifier and allow it to 'warm up' a minute or so before playing any audio
signal.
8. Turn up the volume and enjoy.
You have two amplifier modes - triode and ultralinear. Triode is about half power but is a
less complex audio path which suits some peoples tastes and speakers. Quiet music or
efficient speakers work well in this mode. Damping factor is slightly lower. Ultralinear is
a more common amplifier mode that allows more power, higher damping factor and a
wider range of speakers to be used. Before switching, turn off the amps to prevent
thumps and unwanted noises. Try both - Use the mode that suits you. Best performance
of tube amps is after they are well warmed up, generally about a half hour after powering.
You should get years of use from the tubes. Some statistically last less long and some last for
30 years. Checking bias every month usually will show you if they are drifting and
performing within specification. Excess noise and microphonics, a tube turned white or
not glowing are also big clues a tube needs to be replaced.