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CONNECTING YOUR AMPLIFIER
Setting up your amplifiers is rather easy.
1. Connect all source components (turntable, CD, Tuner, Tape DAT, etc.) to
your preamplifier or switching center.
2. Connect the interconnects from the output of the preamplifier to the RCA input
on the top rear of the amplifiers.
3. Connect the hot or "+" speaker cable to the red binding post and the common or
"-" speaker cable to the black binding post (See diagarm 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
break the connections inside the amplifier.
4. Ensure that the "mains" switch on the front panel is in the "off" or "0" position. If
the 807s are not inserted - do it now - .
5. Turn on Preamplifier and any source components you plan to use.
6. Plug Amplifiers into wall outlets.
7. Set both amps up at the same SE or PP settings. SE is a good place to start.
8. Switch the square mains power switch to the ON or "1" position and allow the
amplifier a minute or so to 'warm up'. The glowing panel and glowing tubes will
indicate that the amplifier is on.
9. Turn up the volume on the preamp and enjoy. If something is "humming" don't
panic. All you need to do is use a "3 pin to 2 pin AC adapter" or "cheater". The
problem is too many grounds - you should only have one. Check out the next
section for help with hum.
10. Now, while music is playing, try switching to PUSH / PULL. The difference
may or may not be subtle. Choose the mode you like best with this music. There
may be a distressing "click" as you switch - this is normal.
GROUNDING and POWER:
In the event of HUM we suggest that you alter the ground scheme. Electronic gear
often has 3 pin grounds for safety reasons and international regulations. Unfortu-
nately audio equipment is also prone to sensitivity to ground loops. The usual
cure is to use 3 pin to 2 pin AC adapters availble at most hardware stores for
about a dollar. Do not break off the AC ground pin.
With the power off, try an adapter on ONE of the amps. If you have other units such
as preamps or CD players with 3 pin AC plugs, use adapters here as well. The
goal is to have ONLY ONE piece of equipment connected to AC ground via AC
plugs. Other gear is grounded via the RCA interconnects. Only after all connec-
tions have been made should you turn on the power with the amplifiers being last
on and first off always.
A different alternative is to ground the preamp and to use adapters on every other
piece of gear with 3 pin AC plugs. Alas, few preamps have AC ground pins.
A third alternative is to use "balanced AC" (60-0-60) transformers to power all the
equipment. The latest revision of the USA electrical codes allows this as a "legal"
technique. It works very well at reducing many types of noise 10 to 15 dB.