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18. DIRECT OUT
The AC50/100CP amplifier has a very comprehensive DI circuit, as explained earlier in this manual.
Please refer back to the note 13 (Output Master Volume control) which explains the relationship
between the DI circuit and the amplifier.
The DI is outputted on either Balanced XLR or Unbalanced Jack connection and both are con-
trolled by the LEVEL rotary control. The GROUND LIFT Switch will either connect the external
equipment to the AC50/100CP direct grounding or to a phantom ground circuit to prevent ground
loops occurring, please try both positions for best performance.
The LPF (Low Pass Filter) switch will change the DI response to either the normal amplifier
frequency response for use when connecting to slave amplifiers and guitar type speaker sys-
tems, or, when switched on, will introduce a very sharp filter network that removes the high
frequencies that are normally removed by guitar loudspeakers. This enables the amp to be di-
rectly connected to PA or recording equipment and speaker emulated sounds to be achieved.
Please remember that by turning the Master Volume to 0 you can silent “record” from the DI
output. It is HIGHLY RECOMMENDED that when doing so that the amplifier is still connected to
the normal loudspeaker system so that if the Master is accidentally turned up then no damage
can occur to your amplifier.
19. FOOTSWITCH JACK
This jack is for connecting the supplied VF002 double footswitch to the amplifier for remote
channel (switch A) and reverb switching (switch B).
If you require to use an alternative switching system (MIDI switcher for instance) then the follow-
ing information will be of use: -
Both switches are short to ground - Channel switching = jack Tip – channel 1 is closed – channel
2 is open – Reverb = jack Ring – reverb off is closed – reverb on is open. Approximately 7.5Vdc
@ 10mA is present on open switches.
20. OUTPUT VALVE BIAS CONNECTION COVER
This plate covers the 2 potentiometers and test measuring points for setting the operational bias
of the output valves. This should be done by qualified personnel only!
21. HT FUSE
The HT fuse protects the high voltage secondary circuit that supplies the valve circuits, particu-
larly the output valves. This fuse will typically blow in the case of an output valve failure, but can
also blow in the event of any other secondary circuit failure.
WARNING! IF THE FUSE SHOULD FAIL REPLACE IT ONLY WITH THE CORRECT TYPE AND RATING
OF FUSE. Do not use any other value or serious damage could occur.
22. MAINS POWER INPUT and FUSE
The incoming mains power lead is connected to this inlet. Please use the supplied mains lead, or
one of at least the same ratings (if in doubt check with your dealer). Before connecting the mains
power please check that it is compatible with your amplifier, by checking that it matches the rating
plate on the amplifier back panel.
The fuse that is in the mains inlet is there to protect you, your amplifier, and the mains circuit that
you are connected to. If the fuse blows it is usually for a good reason, especially if it blows again
after you replace it.
WARNING! IF THE FUSE SHOULD FAIL REPLACE IT ONLY WITH THE CORRECT TYPE AND RATING
OF FUSE. Do not use any other value or serious damage could occur.
Please note! Your amplifier is designed to operate correctly on the A.C. Voltage and Frequency
that is noted on the back panel mounted rating plate. If you wish to export/import this product to
another country it may not be compatible and may require modification to suit. If in doubt please
consult a VOX dealer or distributor.