VAC Renaissance Mk II Preamplifier - Manual (Page 11)

10
CARE OF CHASSIS
VAC chassis are machined aluminum for superior electromagnetic performance. The main
chassis is finished in a durable clear coat over color powder coat paint. The fascia is finished
in hand rubbed lacquer (similar to a fine automobile). The power supply chassis is finished
in durable textured gloss paint. Cleaning the units with a damp cloth WHILE THE AMP IS
SWITCHED OFF AND UNPLUGGED should suffice. Do not get cleaning solutions onto or into
the tube sockets.
REPLACEMENT OF TUBES
Please refer to the chart on the next page.
Before replacing tubes, all power must be turned off. Allow 15 minutes for the tubes to cool
down before removing the top glass cover - in use they become hot enough to cause
burns.
Install new tubes of the appropriate types firmly in their sockets, noting the location of holes
in the socket and pins of the tubes, taking care to make sure that pin pattern corresponds
to holes in tube socket. Replace the glass cover before operating the preamplifier.
In the event that trouble is encountered, check all signal, speaker and power connections.
If the problem persists, follow all safety precautions stated earlier in this section, and check
that all tubes are correctly seated in their sockets. If possible, try another tube. If the problem
persists, please consult your VAC dealer or contact the factory directly.
Tubes are like the tires on a car; they will eventually need replacement. Murphy's Law states
that a tube will probably fail right at the start of a long holiday weekend. Therefore, many
audiophiles keep a spare tube of each type on hand, just in case!
There is no substitute for the 8416 tube type.
We strongly recommend that you use only tubes specifically selected and tested by VAC
for this application.
VAC can test tubes for concerned customers.