Silvertone 1433 - Microphone preset

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

The Silvertone 1433 has a Microphone channel (Treble) and an Instruments channel with three jacks (Treble and Bass). Two 12AX7s handle preamp duties, a 6CG7 is the phase inverter, and a cathode-biased push-pull pair of 6L6GBs runs from a 5Y3GT rectifier. A 6AU6 phase-shift oscillator provides footswitchable tremolo.

• Made in: USA
• Channels: 2
• Preamp tubes: 2× 12AX7, 1× 6CG7, 1× 6AU6
• Power tubes: 2× 6L6GB

Tags: american, vintage, 6l6, tremolo, two-channel.

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.