Marantz Model 8B preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Marantz Model 8B is a stereo tube power amplifier with two identical channels. In each, a triode-connected 6BH6 pre-driver feeds a 6CG7 long-tailed driver-inverter driving a fixed-bias push-pull pair of 6CA7/EL34s into 4, 8 or 16-ohm outputs, with a built-in meter for setting bias and AC balance. It has no preamp or tone controls, and is one of the best-known American hi-fi amps of the tube era.

• Made in: USA
• Wattage: 35W
• Channels: 1
• Preamp tubes: 2× 6BH6, 2× 6CG7
• Power tubes: 4× EL34

Tags: american, vintage, el34, stereo, power-amp, clean.

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.