RCA Hi-Fi 15W and 50W Reference Circuits - Main preset

Verified · 85/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

RCA published reference amplifier circuits in their vacuum tube manuals as practical application examples for engineers and builders. These 15W and 50W reference circuits represented the state of the art in American tube amplifier design and became blueprints for countless commercial and DIY amplifiers.

• Years produced: 1955–1965
• Made in: USA
• Wattage: 50W
• Channels: 1
• Preamp tubes: 2× 12AX7
• Power tubes: 2× 6L6

Tags: american, vintage, 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.