VAC Vintage Line Stage Mk II Operating Instructions
VAC VINTAGE LINE AMPLIFIER Mk II
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 Line Amplifier is a zero-global-feedback, Class A, triode line amplifier &
controller. It is to be operated from the voltage visible on the configuration card, visible
under the fuse. The fuse is a slow blow type of the size labelled 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, to prevent possible damage to speakers and power
amplifiers, always MUTE the preamp before switching off power.
3.
Allow 30 seconds for warm up before leaving MUTE.
4.
The Vintage Line Stage 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
effects of the tape recorder. To record, select the record enable position ("TAPE
ON") of the TAPE MONITOR switch. If you wish to monitor the output from the
recorder's monitor head (if so equipped) select the monitor position ("MON"). It is
recommended that this switch not be cycled during important recordings.
6.
Tube compliment is:
V1
12AU7A/E82CC
amplifying triode
V2
12AX7A/E83CC
impedance translator triode
7.
Tube shields are provided, but their use is recommended only in those rare
installations with rf of emf interference.