Vox AC30 Brian May Owner`s Manual [en, fr, de, es]
E F G S 1
IMPORTANT SAFETY INSTRUCTIONS
•Read these instructions.
•Keep these instructions.
•Heed all warnings.
•Follow all instructions.
•Do not use this apparatus near water.
•Mains powered apparatus shall not be exposed to dripping or splashing and that no objects filled with liquids, such as vases, shall be placed on the apparatus.
•Clean only with dry cloth.
•Do not block any ventilation openings. Install in accordance with the manufacturer's instructions.
•Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
•Do not defeat the safety purpose of the polarized or groundingtype plug. A polarized plug has two blades with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet. (for U.S.A. and Canada)
•Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.
•Only use attachments/accessories specified by the manufacturer.
•Unplug this apparatus during lightning storms or when unused for long periods of time.
•Turning off the power switch does not completely isolate this product from the power line so remove the plug from the socket if not using it for extended periods of time.
•Install this product near the wall socket and keep the power plug easily accessible.
•WARNING—This apparatus shall be connected to a mains socket outlet with a protective earthing connection.
•Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
•Do not install this equipment on the far position from wall outlet and/or convenience receptacle.
•Do not install this equipment in a confined space such as a box for the conveyance or similar unit.
•Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.
The lightning flash with arrowhead symbol within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage” within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the product.
CE mark for European Harmonized Standards
CE mark which is attached to our company’s products of AC mains operated apparatus until December 31, 1996 means it conforms to EMC Directive (89/336/EEC) and CE mark Directive (93/68/EEC). And, CE mark which is attached after January 1, 1997 means it conforms to EMC Directive (89/336/EEC), CE mark Directive (93/ 68/EEC) and Low Voltage Directive (73/23/EEC).
Also, CE mark which is attached to our company’s products of Battery operated apparatus means it conforms to EMC Directive (89/336/EEC) and CE mark Directive (93/68/EEC).
* Company names, product names, and names of formats etc. are the trademarks or registered trademarks of their respective owners.
AALWAYS use the supplied mains lead, if a replacement is
required please contact your authorized Vox Dealer.
BDO NOT switch the amplifier on without a loudspeaker connected.
CENSURE that any extension cabinets used are of the correct impedance.
DNEVER attempt to bypass the fuses or fit ones of the
incorrect values.
EDO NOT attempt to remove the amplifier chassis, there are no user serviceable parts.
FRefer all servicing to qualified service personnel including replacement of fuses and valves. Servicing is required when the apparatus has been damaged in any way, such as when the power supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate
normally or has been dropped.
CAUTION: Any changes or modifications not expressly approved by the party responsible for compliance may void the users authority to operate the equipment.
Note: It is recommended that all audio cables, with the exception of the speaker lead, used to connect to the AC30BM are of a high quality, screened type. These should not exceed 10 metres in length.
Always use a non-screened Vox approved speaker lead with the AC30 Amplifier and extension cabinets.
WARNING: Do not obstruct ventilation grilles and always ensure free movement of air around the amplifier!
2
OPERATIONAL INSTRUCTIONS
Congratulations on your purchase of the AC30 BRIAN MAY CUSTOM LIMITED EDITION.
FRONT PANEL LAYOUT
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Front panel features:
To say this front panel is minimalist is a gross understatement!
1. VOLUME control |
This sets the overall volume of the amp. At low settings the amp is clean |
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with glass-like note articulation (especially with the Boost engaged), while |
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at high settings the amp opens up and roars with violin-like sustain. Oh, |
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and it’s very loud too. |
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Needless to say Brian’s favourite setting of this control is MAXIMUM. |
2. Standby Switch: |
This switch allows the amplifier to attain the correct working temperature |
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before applying the H.T. supply. |
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Before connecting the amplifier to the Mains supply, ensure the Power and |
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Standby switches are in the off position. |
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Turn on the Power switch first and then wait 2–3 minutes before turning on |
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the Standby switch. Doing this each time you play helps prolong tube life.The |
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Standby switch is also very useful for playing live as it allows you to keep |
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the valves at a functional temperature between sets. |
3. Power Switch: |
This is the ON/OFF switch for the power to the amplifier. Down (towards |
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the rear of the amp) the mains power is connected to the amp and it’s on. |
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Up (towards the front of the amp) is off. |
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Please ensure the amplifier is switched off and unplugged before being |
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moved. |
3
REAR PANEL LAYOUT
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Rear panel features:
4. LOUDSPEAKER jack (mounted underneath the chassis)
16 ohm connection to the internal Celestion G12 Alnico loudspeakers (Two 8 ohm speakers connected in series). If required these can be disconnected by removing the speaker jack plug and connecting the amp output into an extension cabinet of your choice, provided that the cabinet is rated for a total impedance of 16 ohms and has a power rating of at least 40 watts RMS.
5. OUTPUT POWER CONTROL switch
This switch converts the output stage of the AC30 BRIAN MAY CUSTOM LIMITED EDITION from the full power rating of 30 watts (33 watts actual clipping) to that of an AC15, which is 15 watts.
The AC30 BRIAN MAY CUSTOM LIMITED EDITION amp has a unique VOX circuit that does a TRUE & PROPER power reduction, in that it disconnects 2 of 4 the output power tubes (or valves). It also adjusts the bias circuit (as this is a cathode biased amp, it changes the cathode bias resistor), and last, but most importantly, it adjusts the output transformer impedance to the correct value for running only 2 output tubes.
6. BOOST GAIN switch |
This gives two gain settings for the built-in Brian May boost circuit, namely |
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High and Low. The High setting, obviously, gives the maximum gain boost |
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and is the same as Brian’s boost pedal. |
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The Low setting, which Brian’s pedal does not have, but we wanted to add |
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more flexibility, gives the same treble/mid voicing but has a lower amount |
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of boost gain. |
7. GUITAR INPUT jack |
Although in a rather unconventional position for an input jack, this, as they |
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say, is where you plug your guitar in! |
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As always, please use high quality shielded guitar leads for all connec- |
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tions. NEVER use an un-shielded speaker lead. |
8. BOOST LINK OUTPUT jack
This jack allows you to daisy chain the signal from the output of the booster stage into other amplifiers, delays, or other effects, etc. If using another AC30 BRIAN MAY CUSTOM LIMITED EDITION, the other end of the link lead would feed the Guitar Input jack, but do not use the Booster circuit in the second or further amps. The safest way would be to isolate the boost circuit by using the Boost ON/OFF switch (9).
4
9. BOOST ON/OFF switch
ON enables the use of the BOOST circuit (and allows for footswitch control (10)). OFF (BYPASS) disables the use of the BOOST circuit (and footswitch) completely.
10. BOOSTER FOOTSWITCH jack
This jack provides connection to use the supplied VOX VF001 single footswitch (VOX VF001). The LED indicator glows RED when the BOOST circuit is active, and is OFF when the BOOST circuit is bypassed.
11. Mains Input |
This is where the supplied, detachable Mains (power) cord is connected. |
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The specific mains input voltage rating that your amplifier needs to run at |
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is located on the rear panel of your amplifier. Before making any connec- |
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tions or powering up the amplifier, make sure the correct voltage is set. If |
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you have any doubt, refer to your local VOX dealer. |
12. Mains Fuse |
This fuse provides an overall safety protection in the event your amplifier |
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develops and electrical fault. The correct value of the fuse is located on the |
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rear panel of your amplifier and should only be replaced with one of the |
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same value. |
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Specifications |
Power Output: |
30 Watts RMS into an 16 ohm loudspeaker load. |
Internal speaker: |
2x 8 ohm 12", 15 Watt VOX/Celestion AlniCo Blue. |
Power supply: |
GZ34/5AR4 rectifier, modified AC30 power supply circuit. |
Power amplifier: |
12AX7/ECC83 Phase Splitter (inverter), 4x EL84/6BQ5 push-pull cathode |
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biased, producing a minimum of 30 Watts RMS into a 16 ohm loudspeaker |
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load, switchable to 15 Watts RMS. |
Pre-amplifier: |
12AX7/ECC83 modified AC30 “Normal” channel circuit. |
Input Boost Circuit: |
High Mid/Treble (boost approx 46dB)—discrete transistor circuit – remote |
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footswitch operation. |
Mains input: |
preset 100V or 120V or 230V or 240 V ~ 50 or 60 Hz depending on country |
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of sale. Please see Rating Plate on rear of amplifier for exact specification. |
Dimensions: |
705 x 540 x 265 mm / 24" x 21.25" x 10.4" (W x H x D) |
Weight: |
33.5 kg / 73.85 lbs. |
Included items: |
Power cable, VF001 footswitch, dust cover. |
Appearance and specifications of this product are subject to change without notice.
URL = http://www.voxamps.co.uk
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