Always ensure a speaker is connected to the amplifier before powering up or
damage to the output transformer may result. Never unplug a speaker when
the amplifier is ON as this is even more likely to damage the transformer and
the output valves.
I will explain about the speakers on a V10:
The output transformer has 2 tappings, an 8 Ohm and a 4 Ohm.
The internal speaker, (impedance 8 Ohms), is connected to the 8 Ohm tapping
on the output transformer via the output socket labelled: INTERNAL SPEAKER.
The 2 extension sockets are wired in parallel and are connected to the 4 Ohm
tapping.
So, if you have an 8 Ohm extension speaker, you must move the internal
speaker jack to one of the ‘EXTENSION SPEAKER’ sockets and plug the
extension speaker into the other ‘EXTENSION SPEAKER’ socket. The 2 x 8 Ohm
speakers will then be wired in parallel for a total of 4 Ohms.
If you have 2 x 8 Ohm extension speakers, they are connected into both
‘EXTENSION SPEAKER’ sockets for a total of 4 Ohms but the internal speaker
must be disconnected and not used.
If you have a 4 Ohm extension speaker, this can be plugged into either of the
‘EXTENSION SPEAKER’ sockets but the internal speaker must be disconnected
and not used.
If you have a 16 Ohm extension speaker, you can plug this into either of the
‘EXTENSION SPEAKER’ sockets and then move the internal speaker jack into
the other ‘EXTENSION SPEAKER’ socket. This will give a total load of 5.33
Ohms so the amp will not be quite as loud but it will not be harmed.
If you have 2 x 16 Ohm extension speakers, they should be connected to the
single INTERNAL SPEAKER socket. Unplug the internal speaker, take a wire
from this socket to the first 16 Ohm cabinet and then connect this cabinet, (via
the LINK socket) to the input of the second 16 Ohm cabinet. All Victory
cabinets have a LINK socket which is wired in parallel with the INPUT socket.
This configuration will result in an 8 Ohm total impedance, (the same as the
single internal speaker). The internal speaker must be disconnected and not
used in this configuration.
