What tubes does the McIntosh MA2275 use?

The McIntosh MA2275 uses 4× 12AX7A, 2× 12AT7 preamp tubes and 4× KT88 power tubes.

When was the McIntosh MA2275 produced?

The McIntosh MA2275 was produced 2004–2011.

McIntosh MA2275 preset

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

The McIntosh MA2275 is a stereo valve integrated amplifier rated at 75 watts per channel into 2, 4 or 8 ohms. Four 12AX7As handle the phono and line-level preamp circuitry. In each power channel an op-amp input stage feeds a 12AT7 differential driver, and transistor followers drive a fixed-bias push-pull pair of KT88/6550s into a McIntosh Unity Coupled output transformer, with overall feedback. Left and right channels are identical.

Years produced: 2004–2011
Made in: USA
Wattage: 75W
Channels: 1
Preamp tubes: 4× 12AX7A, 2× 12AT7
Power tubes: 4× KT88

Tags: american, modern, stereo, kt88, 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.