Marshall Amplification manual 1959HW Rear Panel

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11.LOW SENSITIVITY INPUT FOR CHANNEL I

This is the ‘low sensitivity’ guitar input for Channel I. It is 6dB lower in volume than the ‘high sensitivity’ input and has a darker sound as well due to its significantly lower input impedance.

Interesting aside: Back in the day, a ‘high sensitivity’ input jack was recommended for use with a guitar loaded with low-output pickups (e.g.: single coils) while the ‘low sensitivity’ input was recommended for higher output pickups (e.g.: humbuckers). This said, the majority of guitarists - then and now - ignore these recommendations and plug high-output guitars into the ‘high sensitivity’ input because it further boosts the strength of their signal.

12.HIGH SENSITIVITY INPUT FOR CHANNEL II

This is the ‘high sensitivity’ guitar input for Channel II, the so-called ‘Normal’ channel.

13.LOW SENSITIVITY INPUT FOR CHANNEL I

This is the ‘low sensitivity’ guitar input for Channel II. It is 6dB lower in volume than the ‘high sensitivity’ input and has a darker sound as well due to its significantly lower input impedance.

1959HW Rear Panel

1.LOUDSPEAKER OUTPUTS

WARNING! Never use the amplifier without a load attached!

There are two parallel loudspeaker output jacks provided for connection to speaker extension cabinet(s). Please always ensure that the amplifier's output impedance selector is set correctly (see item 2) and ALWAYS ensure you use good quality speaker (unshielded) cables. NEVER use guitar (shielded) cables.

Always use a non-screened Marshall approved speaker lead when connecting an extension cabinet to these units.

2.OUTPUT IMPEDANCE SELECTOR

Matches the amplifier’s output to the load (speaker) impedance.

Your 1959HW should be completely powered down before the Output Impedance Selector is turned.

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WARNING! Do NOT use any other combination of cabinets and/or impedances. Doing so may result in damage to the amplifier! An extension speaker cabinet with an impedance of less than 4 Ohms, or two extension cabinets of 4 Ohms or less should NOT be used with this amplifier.

Failure to comply with any of the points raised in this section will result in damage to the amplifier.

3. MAINS SELECTOR

Matches the amplifier’s mains transformer to the incoming mains voltage.

Your 1959HW should always be completely powered down before the mains selector is turned.

WARNING! ALWAYS ensure that this rotary selector is set to the correct mains voltage applicable for the country where the 1959HW is being used. If you do not know, consult your authorized Marshall dealer.

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Performance Note: Bridging or ‘jumping’ the two channels

Because both Channels of the 1959HW have the same number of gain stages (two) and are therefore in phase with each other, it is possible to bridge them together (‘slaving’, ‘jumping’, ‘linking’ or even ‘daisy- chaining’) and use them both at the same time. Doing this enables you to expand upon the amp’s tonal possibilities by mixing the two channels together.

The most common way of doing this is to plug your guitar into the top (high sensitivity) input of Channel I and then run a short ‘jumper’ guitar cable (i.e. a screened cable) from the Channel I’s bottom (low sensitivity) input to the top (high sensitivity) input of Channel II. (fig. 1)

The ‘reverse’ is also possible – namely plugging your guitar into Channel II’s top input and then running the ‘jumper’ cable from Channel II’s bottom input to Channel I’s top input. This less common approach can yield some interesting tonal variations. (fig. 2)

As is the case with any Marshall all-valve amplifier it is imperative that: a) the amplifier is connected to a load whilst in operation and b) the impedance selected on the amplifier matches the total impedance of the extension speaker cabinet(s) being used.

1x16 Ohm cabinet - Selector on 16 Ohm Use either speaker output

2x16 Ohm cabinets - Selector on 8 Ohm Use both outputs

1x8 Ohm cabinet - Selector on 8 Ohm Use either output

2x8 Ohm cabinets - Selector on 4 Ohm Use both outputs

1x4 Ohm cabinet - Selector on 4 Ohm Use either output

Adjusting the selector from 230V to 120/100V or vice-versa will require the mains fuse (item 5) to be changed to the correct value as detailed on the rear panel.

4. MAINS INPUT

Your amp is provided with a detachable mains (power) lead, which is connected here. The specific mains input voltage rating that your amplifier has been built for is indicated on the back panel. Before connecting for the first time, please ensure that your amplifier is compatible with your electricity supply. If you have any doubt, please get advice from a qualified technician. Your Marshall dealer will help you in this respect.

5. MAINS FUSE

The correct value of mains fuse is specified on the rear panel of the amplifier. NEVER attempt to bypass the fuse or fit one of the incorrect value.

6. H.T. FUSE

The correct value of this H.T. fuse is specified on the rear panel of the amplifier. NEVER attempt to bypass the fuse or fit one of the incorrect value.

Fig. 1 Fig. 2

Follow all instructions and heed all warnings

KEEP THESE INSTRUCTIONS !

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