Vox Classic Plus AC50 - Manual (Page 7)

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15. POWER SWITCH
This switch turns the mains power coming into the amp on or off. When the amp is active the Red
LED above the switch will be illuminated.
The correct procedure for powering up your AC50/100CP amplifier (and indeed virtually every
valve guitar amp made) is A) Check that the amplifier’s rating is suitable for the mains power that
you are using (i.e. a 230V rated amp is going to be connected to 230V mains power, 120V to
120V etc, if in doubt please consult your VOX dealer), B) ensure that all cables (speaker, footswitch,
FX loop, etc) are already connected, C) ensure MAINS and STANDBY switches are in the OFF
position and then connect the mains power cord to the amplifier, D) turn ON the POWER switch
and ensure that the RED LED is ON, E) wait for at least 2 minutes for the valves to warm up, and
then F) turn ON the STANDBY switch. Your amplifier is now ready for use. Allowing the amplifier
to warm up in this way will ensure that the valves are not subjected to too much stress and will
help them to achieve maximum life.
REAR PANEL CONTROLS AND FUNCTIONS
16 17 19 21 22 18
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16. LOUDSPEAKER OUTPUTS
Two parallel connected jack sockets for feeding 1 or 2 loudspeaker cabinets of your choice (We
recommend VOX model V412BN 4x12” speaker cabinets). The Impedance Selector Switch al-
lows you to connect either a 16 ohm or 8 ohm loudspeaker system to your amplifier. It is ex-
tremely important to the continued safe running of your amplifier that the speaker and amplifier
impedances are closely matched – output valve and transformer damage can occur if this is not
done!
For 1 x 16 ohm cabinets set selector to 16 ohm. For 2 x 16 ohm cabinets set selector to 8 ohms.
For 1 x 8 ohm cabinets set selector to 8 ohms. Any other combination CANNOT be used.
17. EFFECTS LOOP
The series effects loop is situated between the outputs of the preamp stages and the input of the
Reverb stage. The signal is then fed into the power amp stage. The BYPASS slide switch will
either engage the loop (switch ON) or disconnect the effects loop circuitry from the rest of the
amplifier (switch OFF). We recommend that if you are not using the loop then the switch should
be set to the OFF position.
With the LOOP switch in the OFF position, the SEND jack socket is still operational and can
therefore be used to send the signal to another device such as a tuner or slave amplifier.
The LOOP LEVEL Switch allows the loop to be used at two different signal levels (approximately
+4dBV (high) and -10dBV (low)). This will enable a wide range of devices to be connected to the
amplifier. We do not recommend the use of stomp box devices in a loop, particularly Fuzz and
Distortion pedals as these can limit the headroom of the amplifier and prevent you achieving full
power output.