What tubes does the Kalamazoo Reverb 12 (Version A) use?

The Kalamazoo Reverb 12 (Version A) uses 3x 12AX7 preamp tubes and 2x 6V6 power tubes.

When was the Kalamazoo Reverb 12 (Version A) produced?

The Kalamazoo Reverb 12 (Version A) was produced 1967–1969.

Kalamazoo Reverb 12 (Version A) preset

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

The Kalamazoo Reverb 12A is the first revision of the Reverb 12, featuring updated component values for improved reliability and a slightly refined reverb circuit. It retains the original's warm character while addressing some reliability concerns identified in the field. The Reverb 12A is functionally similar to the original and equally collectible.

Years produced: 1967–1969
Made in: USA
Wattage: 12W
Channels: 1
Preamp tubes: 3x 12AX7
Power tubes: 2x 6V6

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.