VAC Vintage Mk II - Manual (Page 2)

In the refined form presented in the VAC, this circuit delivers true state-of-the-art
performance, and repudiates the more complex designs seen even to this day. The output
stage features independent cathode bias for each tube, which results in excellent sound and
the most stable and maintenance free operation available anywhere.
Premium parts are employed throughout, including 14 pound 22 section bifilar-wound ultra-
wideband output transformers, polypropylene and polystyrene signal capacitors, high current
rectifiers, low ESR power supply, and proprietary wiring. The quality of parts and careful
layout allows the use of very little feedback for high sonic purity and low distortion.
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