Footswitch - Gain I/II, Compressor
This is a stereo 1/4” jack socket for connection to the supplied two way latching
footswitch, that enables the user to remotely switch between GAIN I and GAIN II and
to switch the COMPRESSOR on or off.
N.B. If either GAIN II or COMPRESSOR are already selected by the switches on the
front panel, this will over ride any footswitch settings, therefore, for the footswitch to
work properly, make sure these are turned off on the front panel.
Power Amp
The V-Type V8 is powered by eight KT88’s. These are configured for GRID BIASED
CLASS A/B. This is the traditional arrangement for a high powered amplifier of this
type, to efficiently produce at least 400 watts with the valves supplied (at the rated
nominal mains input voltage).
Output Impedance Switch and Speaker Outputs
The OUTPUT IMPEDANCE switch allows the power stage to be set to drive either
2 or 4Ω loads as indicated.
These ratings are the preferred nominal impedance speaker loads that should be
connected. However, it is OK to drive
slightly
higher value loads, i.e. driving an 8Ω
cabinet with the 4Ω setting, without too much perceived difference in power transfer.
The two sockets, one 1/4” jack and one female XLR, are for connection to speaker
cabinets. These are internally wired in parallel, either or both may be used. However,
due to the higher current rating of the XLR socket we recommend this is used
whenever possible.
N.B. When using more than one speaker socket or cabinet the overall effective
impedance should be correctly worked out and the appropriate OUTPUT
IMPEDANCE setting used.
IMPEDANCE FORMULA
For two cabinets in parallel this can be calculated as follows:-
ZT (total impedance) = Z1 x Z2
Z1 + Z2
Therefore, as an example, if two 8Ω cabinets are used,
8 x 8 = 64 = 4 therefore the 4Ω socket should be used.
8 + 8 16
Alternatively, if one cabinet is 8Ω and the other is 4Ω,
8 x 4 = 32 = 2.667 therefore the 2Ω socket should be used.
8 + 4 12
8
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