Valve Amplification Company
1731 Northgate Boulevard, Sarasota, FL 34234 USA
Telephone 941-359-2066 / Fax 941–359-2057
www.vac-amps.com
VAC VINTAGE PREAMPLIFIER Mk III
Operating Instructions
DO NOT OPEN THIS UNIT - THERE ARE NO USER SERVICEABLE PARTS INSIDE.
DO NOT TOUCH TUBES UNTIL UNIT HAS BEEN SWITCHED OFF FOR 5
MINUTES. TUBES BECOME HOT IN USE. DO NOT EXPOSE THIS UNIT TO
MOISTURE. DO NOT PLUG INTO AN AC SOURCE UNTIL ALL CONNECTIONS
ARE COMPLETED.
Introduction
The Vintage Preamplifier features a zero-global-feedback, Class A, triode line amplifier &
controller, and a Class A triode phono amplifier employing both passive and active RIAA
equalization techniques. It is to be operated from the voltage labeled on the back panel, 50-
60 Hz. The fuse is a slow blow type of the size labeled on the back of the unit.
Connection
1.
Complete all connections before connecting the AC cord to the wall outlet.
2.
At turn on, the volume control should be full counter-clockwise and the mode switch
should be set to MUTE. Also, always MUTE the preamp before switching power off,
to prevent damage to amplifiers or speakers.
3.
Allow 30 seconds for warm up before leaving MUTE.
4.
The Vintage Preamplifier inverts phase from all inputs to the main outputs. To correct
for this reverse the speaker connections in both channels. Output to the tape jacks
does not invert.
5.
In normal operation no signal is present at the tape output jacks. This is done to
ensure that no degradation of sound occurs due to input non-linearities or loading
