Marshall STUDIO JUBILEE 2525H / 2525C Manual

SPECIFICATION

The JCM25/50 Silver Jubilee Series was produced in 1987 to celebrate 25 years of Marshall Amplification and 50 years of Jim Marshall being in the music business. Inspired by this acclaimed series, the 2525C and the 2525H combine Silver Jubilee preamp features and styling in a lower power design.

FRONT PANEL FUNCTIONS

1. POWER
   This is the on/off switch for the mains power to the amp. When power is switched on, the switch will light red.

please ensure that the amp is switched off and unplugged from the mains electricity supply before being moved.

2. OUTPUT
   The output power is in low power mode (5W) when set to low, when in the middle position it is set to standby and when set to high power the unit runs at full power (20W).
   Standby mode: should be used during breaks in performances, instead of leaving the amp on full power. Always turn the power on for two minutes before using the standby switch.
3. PRESENCE
   Adjusts the high frequencies of the power amp. Increasing the high frequencies adds more bite to your sound.
4. BASS
   Adjusts the low frequencies of the amp. It will add bottom end and depth to your sound.
5. MIDDLE
   Adjusts the mid frequencies of the amp. Giving you anything from a fat and full sound to an aggressive tone.
6. TREBLE
   Adjust the upper frequencies of the amp. Your tone will get brighter as it is turned up.
7. OUTPUT MASTER / LEAD CHANNEL
   The output master control adjusts the output of the preamp section to the power stage.
   The lead channel is selected using the footswitch (supplied PEDL-90003). The channel can also be switched by using the push/pull function of the output master control. The amount of gain applied to the lead channel can be controlled using the input gain control (front panel function 10).
8. LEAD CHANNEL LED
   The LED indicator will light and glow red when the lead channel is selected.
9. LEAD MASTER
   When the lead channel is active (front panel function 7) the lead master control adjusts the output level of the lead channel.
10. INPUT GAIN
    Adjusts the overall sensitivity of the input circuit. It controls the gain level of the clean/crunch rhythm clip mode and the lead channel. The pull switch activates rhythm clip mode, providing heavier, more driven tones.
    Note: the apparent drop in volume when rhythm clip mode is selected may be overcome by increasing the level of the output master (front panel function 7).
11. INPUT
    Use this jack socket to connect your guitar to the amp.

REAR PANEL FUNCTIONS

1. LOUDSPEAKERS
   There are five speaker outputs available. These are 1/4" jack sockets. They are labelled according to the intended impedances:
   • 16Ω: connect a 16 Ohm guitar cabinet to this jack.
   • 8Ω: connect a single 8 Ohm guitar cabinet or two 16 Ohm cabinets.
   • 4Ω: connect a single 4 Ohm guitar cabinet or two 8 Ohm guitar cabinets.

although the amplifier has five speaker outputs, never attempt to connect more speakers than rated. The safe combinations are: 1 x 16 Ohm, 1 x 8 Ohm, 1 x 4 Ohm, 2 x16 Ohm or 2 x 8 Ohm. Any other speaker configuration may stress the power amplifier section and in extreme cases may lead to valve and/or output transformer failure. Never use the 2525 without a speaker load.

2. DI OUTPUT
   A DI output allows you to connect to recording device or sound desk.
   Note: using the DI does not omit the need for a speaker to be connected. See the warning on rear panel function 1.
3. FOOTSWITCH
   Connect the channel footswitch here (PEDL-90003, supplied).
4. FX LOOP
   The series FX loop connects the amp to external FX (nominal level -10dBV). The send jack socket connects to the input of the external FX unit and the return jack socket connects to the output of the external FX unit.
   Note: the send jack socket can be used to connect to an external power amp. This does not omit the need for a speaker to be connected to the amplifier's output stage. See the warning on rear panel function 1. The return can be used to connect an external preamp.
5. HT FUSE
   The panel mounted fuse holder allows access to replace blown fuses. If necessary the HT fuse will blow to protect the internal circuitry. This can sometimes happen in the event of output valve failure.
   Note: replace the fuse only with the value shown on the rear panel. Before attempting to change the fuse you must always first switch the amp off and disconnect it from the mains electricity supply. If in doubt, contact your Marshall dealer.
6. MAINS INPUT
   Connects the amp to the mains power supply.
   Note: the mains input socket has an integrated fuse compartment. Ensure that the value of a replacement fuse matches the labelling on the amp rear panel. You must always first switch off and disconnect from the mains electricity supply before attempting to access the fuse compartment. If in doubt, contact your Marshall dealer.

SAFETY INSTRUCTIONS

Please read this manual carefully before plugging in. Follow all instructions and heed all warnings.

before going any further, make sure that your amp is compatible with your mains electricity supply. If you have any doubt, please seek help from a qualified technician – your Marshall dealer can help you with this.

MAINS INPUT & FUSE
The specific mains input voltage rating that your amp has been manufactured for is indicated on the rear panel of the amp. Your amp is provided with a detachable mains (power) lead, which should be connected to the mains input socket on the rear panel of the amp. The correct value and type of mains fuse is specified on the rear panel of the amp.
Never attempt to bypass the fuse or fit one of the incorrect value or type.

IMPORTANT SET UP INFORMATION

1. When using your amp with one or more speaker cabinets, make sure that they are connected to the correct loudspeaker jack sockets.

failure to do the above may damage your amp. When connecting a speaker cabinet make sure that you use a proper speaker cable. Never use a screened (shielded) guitar cable for this purpose.

2. Ensure that the power switch is set to the off position and the output switch is set to standby.
3. Connect the supplied mains (power) lead into the mains input on the rear panel first and then into an electricity outlet.
4. Ensure that any master, volume and/or output level controls on the front panel are set to zero.
5. Plug your guitar into the input jack socket on the front panel.
6. Turn the front panel power switch on and wait a couple of minutes.
7. Select between 20W / 5W using the output switch.
8. Turn the volume up to your preferred level and you're ready to play.

TRANSPORTING YOUR EQUIPMENT
Please ensure that your amp is switched off, unplugged from the mains electricity supply and all removable cables have been disconnected from your equipment before attempting to move it.

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