What tubes does the Supro Amp 1947 - Normal use?

The Supro Amp 1947 - Normal uses 1× 12AX7 preamp tubes and 1× 6V6 power tubes.

When was the Supro Amp 1947 - Normal produced?

The Supro Amp 1947 - Normal was produced 1947.

Supro Amp 1947 - Normal preset

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

This 1947 Supro is among the earliest documented examples from Valco's Supro brand, produced at a time when electric guitar amplification was still in its formative years. The minimal circuit produces a warm, compressed tone with strong even-order harmonics from the single-ended 6V6 output stage. These early Valco products are historically significant artifacts of American amplifier design.

Years produced: 1947
Made in: USA
Wattage: 3W
Channels: 1
Preamp tubes: 1× 12AX7
Power tubes: 1× 6V6

Tags: american, vintage.

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.