What tubes does the Ampeg M-12A Mercury - Channel 2 use?

The Ampeg M-12A Mercury - Channel 2 uses 3× 12AX7 preamp tubes and 2× 7591A power tubes.

When was the Ampeg M-12A Mercury - Channel 2 produced?

The Ampeg M-12A Mercury - Channel 2 was produced 1962–1966.

Ampeg M-12A Mercury - Channel 2 preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The M-12A Mercury is an accordion and keyboard amplifier from Ampeg's mid-1960s lineup using 7591A output tubes. Channel 1 provides clean, warm amplification optimized for accordion's complex harmonic spectrum. The Mercury branding indicates a specific cosmetic and feature package within Ampeg's instrument amplifier range.

Years produced: 1962–1966
Made in: USA
Wattage: 15W
Channels: 2
Preamp tubes: 3× 12AX7
Power tubes: 2× 7591A

Tags: american, vintage, low-wattage, clean, accordion.

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