What tubes does the Marshall JCM600 - Overdrive use?

The Marshall JCM600 - Overdrive uses 4× ECC83 preamp tubes and 2× EL34 power tubes.

When was the Marshall JCM600 - Overdrive produced?

The Marshall JCM600 - Overdrive was produced 1997–2000.

Marshall JCM600 - Overdrive preset

Verified · 88/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The JCM600 was a mid-to-late-1990s, lower-cost two-channel valve range offered alongside the JCM2000. Two relay-switched channels, a clean one and a gain one with diode clipping, each have their own Gain, Treble, Middle, Bass and Volume, and share an op-amp-driven spring reverb, an effects loop and a Presence control. Two ECC83 drivers feed a pair of EL34s, with a speaker-emulated XLR output.

Years produced: 1997–2000
Made in: UK
Wattage: 60W
Channels: 2
Preamp tubes: 4× ECC83
Power tubes: 2× EL34

Tags: british, crunch, reverb, el34, two-channel.

Schematic-derived preset files for 16 Fractal and Line 6 modelers: Axe-Fx II/XL/XL+, Axe-Fx III, FM3, FM9, and the full Helix family (Floor, LT, Rack, HX Stomp, HX Stomp XL, Native).

Gridleak extracts amp parameters from original circuit schematics using AI vision — component values, gain staging, tone stack topology, tube types — then generates native preset files for every supported modeler. Every extraction is scored 0–100 and the score is published.