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* EDIT: Up-to-date information is available in Yek's Guide to the Fractal Audio Amplifier Models *
Brit JVM: based on Marshall JVM410 head
The JVM410H is Marshall’s flagship guitar amplifier, for a long time already. It’s a 100 watts EL-34 powered head with four channels and three modes (voices) per channel. These twelve (!) sounds cover the entire Marshall spectrum: JTM 45, Plexi, JCM 800 etc. and adding over the top hi-gain.
According to the amp’s handbook, the JVM’s power amp stage is based on the one found in the JCM800 2203 and model 1959 Super Lead Plexi.
Cliff:
Here’s what Marshall has to say about its pride and joy:
As noted above, the JVM channels are: Clean – Crunch – OD1 – OD2.
Each channel has these modes: Green, Orange and Red.
Fractal Audio provides models of all three modes of channels OD1 and OD2.
OD1 Green is similar to a hot-rodded JCM 800. OD1 Orange has an additional gain stage, suitable for hard rock and leads. OD1 Red adds even more gain.
The OD2 modes have even more gain and the Middle control is shifted down to being centred around 500 Hz instead of the more typical Marshall value of 650 Hz.
The JVM is equipped with channel/mode switches, reverb and MIDI and has these controls: Bass, Middle, Treble, Gain, Master Volume, Presence and Resonance (Depth).
Note that some of these models have so much gain that it suffices to keep Input Drive pretty low.
Marshall's JVM cabinet uses a combination of the G12 Heritage (G12H) and Vintage 30 (V30) speakers. Take your pick here.
A selection of YouTube videos:
Brit JVM: based on Marshall JVM410 head
The JVM410H is Marshall’s flagship guitar amplifier, for a long time already. It’s a 100 watts EL-34 powered head with four channels and three modes (voices) per channel. These twelve (!) sounds cover the entire Marshall spectrum: JTM 45, Plexi, JCM 800 etc. and adding over the top hi-gain.
Versions of the JVM with less channels are also available.
According to the amp’s handbook, the JVM’s power amp stage is based on the one found in the JCM800 2203 and model 1959 Super Lead Plexi.
The JVM410JS, Joe Satriani’s signature amp, is based on the JVM410, but with enough differences to warrant its own thread (later on).
Cliff:
"IMO, the reason the JVM sounds good is the plate cap on the second-to-last triode. That smooths out the tone considerably. The second-to-last triode is associated with "Triode 1 Freq" in the advanced parameters. You can adjust this to simulate adding a cap to the plate. The other thing that helps the tone is the 220K plate resistor on the last triode. This shifts the bias point down vs. a "classic" Marshall. Unfortunately the bias points aren't exposed to the user."
Here’s what Marshall has to say about its pride and joy:
“The British-built JVM4 is the current flagship Marshall amp. The JVM4 Series has been hailed as a market leader, trouncing the competition on tone and value for money. One review described, 'In a market sector with more than its fair share of indifferent, run-of-the-mill black boxes, Marshall has just unleashed a powerhouse of tone that easily competes with boutique designs costing two or three time as much.' – Guitarist Magazine.
British-built, the 100 Watt all-valve JVM410H head redefines versatility thanks to four tonally independent channels: Clean, Crunch, OD1 and OD2, each with three switchable modes. Each mode reconfigures the gain structure of each channel, making twelve modes in total.
The JVM410H front panel looks mind boggling with its twenty-eight controls and eight switches, but because it is intuitively laid out, it is remarkably simple to use. The JVM410H also features four studio-quality digital Reverbs (one per channel), individual channel EQ, two Master Volumes, and a memory that can recall your Reverb, FX loop and Master settings.
Combining some of the finest Marshall sounds, the JVM410H has a vast tonal palette, taking you from ‘Plexi’/JTM45 cleans through JCM800 roar to modern high gain.”
British-built, the 100 Watt all-valve JVM410H head redefines versatility thanks to four tonally independent channels: Clean, Crunch, OD1 and OD2, each with three switchable modes. Each mode reconfigures the gain structure of each channel, making twelve modes in total.
The JVM410H front panel looks mind boggling with its twenty-eight controls and eight switches, but because it is intuitively laid out, it is remarkably simple to use. The JVM410H also features four studio-quality digital Reverbs (one per channel), individual channel EQ, two Master Volumes, and a memory that can recall your Reverb, FX loop and Master settings.
Combining some of the finest Marshall sounds, the JVM410H has a vast tonal palette, taking you from ‘Plexi’/JTM45 cleans through JCM800 roar to modern high gain.”
As noted above, the JVM channels are: Clean – Crunch – OD1 – OD2.
Each channel has these modes: Green, Orange and Red.
Fractal Audio provides models of all three modes of channels OD1 and OD2.
OD1 Green is similar to a hot-rodded JCM 800. OD1 Orange has an additional gain stage, suitable for hard rock and leads. OD1 Red adds even more gain.
The OD2 modes have even more gain and the Middle control is shifted down to being centred around 500 Hz instead of the more typical Marshall value of 650 Hz.
The JVM is equipped with channel/mode switches, reverb and MIDI and has these controls: Bass, Middle, Treble, Gain, Master Volume, Presence and Resonance (Depth).
Note that some of these models have so much gain that it suffices to keep Input Drive pretty low.
Marshall's JVM cabinet uses a combination of the G12 Heritage (G12H) and Vintage 30 (V30) speakers. Take your pick here.
A selection of YouTube videos:
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