This1. POWERis the On/OffSWITCHswitch for mains power to the amplifier. It will light up when your amplifier is receiving the correct mains power and is switched on. It will not be lit when the amplifier is switched off and/or is not receiving mains power.
Please ensure the amplifier is switched off and unplugged from theNote:mains electricity supply whenever it is moved. The2. STANDBYStandby SwitchSWITCHis used in conjunction with the Power Switch (item 1) to ʻwarm upʼ the amplifier before use and to prolong the life of the output valves. When powering up the amplifier always engage the Power Switch first, leaving the Standby switch on ʻStandbyʼ. This allows the application of the voltage required to heat the valves to their correct operating temperature. After approximately two minutes the valves will have reached the correct operating temperature and the Standby Switch can be engaged. In order to prolong valve life, the Standby Switch alone should also be used to turn the amplifier on and off during breaks in a performance. Also, when switching off, always disengage the Standby Switch prior to the main Power Switch. This3. PRESENCEcontrol operatesCONTROLin the 1992LEMʼs power section and adds high frequencies to your sound by altering the power amplifierʼs negative feedback. Turning this control clockwise adds more edge and ʻsparkleʼ to your sound, making it crisper and more cutting.
This4. BASSadjustsCONTROLthe bottom end, turning it clockwise increases the amount of low frequencies in the sound.
This5. MIDDLEadjusts theCONTROLlevel of those all-important mid-range frequencies. Turning it clockwise increases the mids and fattens your sound, giving it more punch. Turning it anticlockwise reduces the mids. This6. TREBLEadjusts theCONTROLtop-end. Turning it clockwise increases the amount of high frequencies (treble) present in the sound, making your tone brighter.
The following four controls - PRESENCE (item 3), BASS (item 4), MIDDLENote: (item 5) & TREBLE (item 6) - are all shared, meaning that they all work on both Channel I and Channel II. The Treble, Middle and Bass controls are highly interactive and altering one control can change the way the other two behave. For this reason, experimentation is recommended.
Lemmyʼs preferred settings are shown on the panel above.
This7. VOLUMEcontrols theI overall output level of Channel I, turning it clockwise increases the volume. This channel is voiced for a higher treble response than Channel II.
This8. VOLUMEcontrols theII overall output level of Channel II, turning it clockwise increases the volume level. This channel is voiced for a ʻnormalʼ, flatter response.
When connecting to any input socket always use a high quality screenedNOTE: guitar lead.
This9. HIGHis theSENSITIVITYʻhigh sensitivityʼ INPUTguitar inputFORforChannelHANNELI - theI brighter of the two channels - and is the one Lemmy uses.
This10. LOWis the SENSITIVITYʻlow sensitivityʼ guitarINPUTinputFORfor ChannelCHANNELI. It isI6dB lower in volume than the ʻhigh sensitivityʼ input and has a darker sound as well due to its significantly lower input impedance.
This11. HIGHis the ʻhighSENSITIVITYsensitivityʼ guitarINPUTinputFORfor ChannelCHANNELII, theIIso-called ʻNormalʼ channel.
This12. LOWis the SENSITIVITYʻlow sensitivityʼ guitarINPUTinputFORfor ChannelCHANNELII. It isI 6dB lower in volume than the ʻhigh sensitivityʼ input and has a darker sound as well due to its significantly lower input impedance.
BecauseP rformanceboth ChannelsNot : Bridgingof the 1992LEMor ‘jumping’have the thesametwonumberchannelsof gain stages (two) and are therefore in phase with each other, it is possible to bridge them together (ʻjumpingʼ or ʻlinkingʼ) and use them both at the same time. Doing this enables you to expand upon the amps tonal possibilities by mixing the two channels together. The same principal can also be used to ʻdaisy-chainʼ two or more amplifiers together.
The most common way to utilise both channels is to plug your guitar into the top (high sensitivity) input of Channel I and then run a short ʻjumperʼ guitar cable (i.e. a screened cable) from the Channel Iʼs bottom (low sensitivity) input to the top (high sensitivity) input of Channel II. (fig. 1) The ʻreverseʼ is also possible – namely plugging your guitar into Channel IIʼs top input and then running the ʻjumperʼ cable from Channel IIʼs bottom input to Channel Iʼs top input. This less common approach can yield some interesting tonal variations. (fig. 2)
WARNING!
1. LOUDSPEAKERNever useOUTPUTSthe 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. Matches2. OUTPUTthe amplifierʼsIMPEDANCEoutputSELECTORto the load (speaker) impedance.
Your 1992LEM should be completely powered down before the Output Impedance Selector is turned.
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
Do NOT use any other combination of cabinets and/or impedancesWARNING!. 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.
Matches3. MAINStheSELECTORamplifierʼs mains transformer to the incoming mains voltage. Your 1992LEM should always be completely powered down before the mains selector is turned.
ALWAYS ensure that this rotary selector is set to the correct mainsWARNING!voltage applicable for the country where the 1992LEM is being used. If you do not know, consult your authorized Marshall dealer. 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.
Your4. MAINSamp isINPUTprovided 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.
The5. MAINScorrect FUSEvalue 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.
The6. Hcorrect.T. FUSEvalue 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.
PowerTechnicalOutputSpecification- 100W RMS
Weight - 21.4 kg
Size - 740mm x 270mm x 210mm
This equipment has been tested and found to comply with* EUROPEthe requirementsONLY of the-EMCNote:Directive (Environments E1, E2 and E3 EN 55103-1/2) and the Low Voltage Directive in the E.U.
* EUROPE ONLY - Note: The Peak Inrush current for the 1992LEM is 38 amps.
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