What tubes does the McIntosh MC240 use?

The McIntosh MC240 uses 3× 12AX7, 2× 12AU7, 2× 12BH7 preamp tubes and 4× 6L6GC power tubes.

When was the McIntosh MC240 produced?

The McIntosh MC240 was produced 1960–1969.

McIntosh MC240 preset

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

The McIntosh MC240 is a stereo valve power amplifier rated at 40 watts per channel, or 80 watts bridged as a mono amp. A selector chooses mono, dual or stereo inputs with gain and balance controls. Each side has a 12AX7 input stage, a 12AU7 phase splitter, a 12BH7 push-pull voltage amplifier and a 12AX7 driver feeding a pair of 6L6GC/7027As through McIntosh Unity Coupled output transformers, with 4/8/16-ohm and 600-ohm outputs.

Years produced: 1960–1969
Made in: USA
Wattage: 40W
Channels: 1
Preamp tubes: 3× 12AX7, 2× 12AU7, 2× 12BH7
Power tubes: 4× 6L6GC

Tags: american, vintage, 6l6, 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.