VAC PA90 User Manual
Page 11
11
REPLACEMENT OF LOW LEVEL TUBES
Refer to Figure 4 for the location and types of tubes. All power must be switched off. Allow
tubes to cool down. Remove and replace with new tubes of the appropriate types, noting the
location of holes in the socket and pins of the tubes.
AC BALANCE may be readjusted for minimum measured distortion if desired, but most tubes
will perform correctly without adjustment.
Replacement tubes are available from VAC and other sources.
For further information, refer to Tips & Advice: A Word About Tubes in General and Tips &
Advice: A Word About Low Level Tubes.
CARE OF CHASSIS
VAC chassis are machined aluminum for superior electromagnetic performance, and finished
in highly polished black lacquer or textured black. This finish is durable but can be scratched
or chipped, just as that of a fine automobile may be damaged. Cleaning with a damp cloth
WHILE THE AMP IS SWITCHED OFF AND UNPLUGGED should suffice.
When shipping your VAC amplifier, be certain to wrap the amplifier in the cloth or tissue
originally shipped from the factory. With the lacquer finish, take care to ensure that there are
no ridges in the cloth. Use of a harsher cloth or the presence of deep wrinkles in the cloth may
result in abrasion of the finish.