VAC Vintage High Power User Manual
Page 2
Unpacking
Each tube socket on the amplifier is covered by a small round sticker. The color of this sticker corresponds to the color
of the sticker on a tube. Fit each tube into the matching socket, first removing the sticker from the tube and socket. The
bias levels for the output tubes have been factory set, but should be checked during the installation procedure.
Installation
Physical requirements:
1)
Provide adequate ventilation - allow at least 3 inches above and 1 inch to each side.
2)
Do not place in a completely enclosed cabinet.
3)
Do not stack other equipment on top of the VAC units.
4)
Do not operate on carpet or any other surface that might block air flow.
5)
The chassis and power transformers will become hot in normal use.
6)
Do not allow the chassis of the VAC components to touch any metal parts, such as the frame of an equipment
rack. This might create a parallel ground path that will degrade the sound of your system.
Electrical connections:
1)
Complete all installation steps before plugging the amplifier into the AC mains supply.
2)
Connect signal inputs to the power amplifiers. Single ended interconnect cables equipped with RCA phono
plugs provide the input to each channel.
3)
Connect loudspeakers between the appropriate pair of binding posts on the back of the power amplifiers. Most
popular speaker cables can be accommodated by the output terminal strips. Output impedance matching is
available for loads of 2, 4, and 8 ohms. Connect one lead of the speaker cable to the "G" position, and the
other to either 2, 4, or 8. The "G" terminal is at ground potential, and the amplifier does not invert phase.
4)
Do not connect two amplifier outputs to each other.
5)
Connect the AC cord to the power source indicated on the rear panel (100 volts AC, 120 volts AC, 220 volts
AC, or 240 volts AC at 50 or 60 Hertz).
6)
Follow the BIAS procedure described in this manual to set the idle current. Check the idle current at 1 minute,
30 minutes, 1 hour, and 2 hours. Also, read the section entitled INSTALLING NEW OUTPUT TUBES.