ENGLISH From Jim Marshall I would like to thank you personally for selecting one of our new ‘JVM’ amplifiers. Since I started Marshall Amplification in 1962 I have witnessed some incredible breakthroughs and advances in amplifier design technology, such as master volume amps, channel switching, reverb, effects loops, MIDI technology, speaker emulation and digital effects processing, to name just a few. These may all seem commonplace features nowadays but that certainly wasn't always the case.
I. Channels, Modes & Memory Presenting the 2-channel, 100W and 50W all-valve JVM amplifiers. Their 2 channels boast 3 modes, giving you a total of 6 different modes to choose from - each with its own unique gain structure. Even though their front panel contains a total of 16 control knobs and 6 LED switches, the JVM is simple to understand and operate thanks to its extremely logical front and rear panel layouts. setups can also be saved and recalled to one of 128 locations via MIDI. II.
The Basics Channel Overview Marshall recommends you always leave a (speaker) load attached to the unit. 2. Ensure that both MASTER VOLUMES on the front panel (5) are set to zero. MAINS INPUT & FUSE (17) 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 rear panel. 3.
Front Panel Operation Channel Section Pressing a channel button has two functions: When pressing in the same channel it cycles the modes: GREEN > ORANGE > RED > GREEN... Each mode remembers the FX, Reverb and Master settings. Example: You are in OVERDRIVE ORANGE with FX + REVERB and you press CLEAN. The amp switches to the last Clean mode you had (let’s assume it was CLEAN GREEN with REVERB). If you press the OVERDRIVE switch you go back to OVERDRIVE ORANGE with FX + REVERB.
SERIAL / PARALLEL FX LOOP (12) The JVM is equipped with a series / parallel FX loop. Connect your external FX equipment input to the JVM SEND jack, and the FX output to the JVM RETURN jack. As described previously, this effects loop can be bypassed from the front panel and the amount of effect can be dialed in with the MIX control. FOOTSWITCH (15) Connect the supplied footswitch using any standard 1/4" jack mono lead.
ENGLISH Technical Specification - Heads JVM210H Head 100W 5x ECC83 + 4x EL34 470kΩ +4dBu -10dBV, +4dBu 22kg 750 x 310 x 215 Power (RMS) Valves Main Guitar - Input Impedance Emulated Output - Level FX Send Level - selectable Weight Size (mm) W, H, D JVM205H Head 50W 5x ECC83 + 2x EL34 470kΩ +4dBu -10dBV, +4dBu 17.
3 JVM210H / JVM205H front panel 1 2 4 8 5 6 7 9 10 JVM210H / JVM205H rear panel 11 12 13 14 15 16 17 9 4 JVM210C / JVM205C / JVM215C front panel 10 7 8 6 5 3 2 1 JVM210C / JVM205C / JVM215C rear panel 17 16 15 14 13 12 11
JVM 2 Channel Block Diagram CLEAN SHAPE CLEAN / CRUNCH GAIN V6:A CATHODE FOLLOWER V6:B V7:A V7:B V8:A CLN / CR TONE CATHODE FOLLOWER CRUNCH VOL V8:B PARALLEL LOOP INPUT OD / GAIN OD TONE GAIN LOOP RECOVERY OD VOL V9:A +4 / -10 MIX SEND RETURN EMULATED LINE OUT FX LOOP BYPASS OUTPUT VALVES (1 & 4 NOT USED IN 50W) REVERB MIXER V9:B POWER AMP INSERT SERIES LOOP V1 BYPASS MASTER 1 PHASE SHIFTER PRE-AMP OUT / SEND PRE-AMP OUT / RETURN V5 V2 SPEAKER OUT MASTER 2 V3 V4 GAIN STAGES