VAC Signature Preamplifier Mk I User Manual
Page 9
REPLACEMENT OF TUBES
Refer to the figure (below) for the location and types of tubes.
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|
|
|12AX7
12AX7
12AX7
12AX7
|
|Low noise Low noise
|
|
|
|
|
|12AX7
12AX7
8416
8416
|
|
|
|
|
|
|
|12AX7
12AX7
12AU7
12AU7
|
|
|
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^
^
^
^
Phono
Phono
Line
Line
Left
Right
Left
Right
Due to the unique nature of the VAC Signature direct coupled circuit, we strongly
recommend that you use only tubes specifically selected and tested by VAC for this
application.
DANGEROUS VOLTAGES EXIST WITH THIS COMPONENT. YOU MUST FOLLOW THESE STEPS
TO PROTECT YOUR SAFETY.
Before replacing tubes, all power must be turned off. Unplug
the power cord from the wall, and remove all audio interconnect cables. Wait 30 minutes
before removing the top cover. 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. Reinstall the top cover
before reconnecting the unit.
NEVER INSTALL OR OPERATE THIS UNIT WITHOUT ALL COVERS IN PLACE.
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.