Bogen K15 / K15Y preset

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

The Bogen K15 is a 15-watt tube public-address amplifier from the late 1950s. Mic 1 and Mic 2 each use one half of a 12AX7, with sockets for plug-in input transformers and their own volume controls, and a phono input has its own volume. They mix into a 6AV6 stage with bass and treble, then a second 12AX7 amplifies and splits the phase for a cathode-biased push-pull pair of 6L6GBs with feedback, on a 6AX5GT rectifier, with 25 V and 70 V line taps.

• Made in: USA
• Wattage: 15W
• Channels: 1
• Preamp tubes: 2× 12AX7, 1× 6AV6
• Power tubes: 2× 6L6GB

Tags: american, vintage, 6l6, 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.