What tubes does the Supro S6651 - Tremolo Reverb Channel use?

The Supro S6651 - Tremolo Reverb Channel uses 2× 12AX7 preamp tubes and 2× 6973 power tubes.

When was the Supro S6651 - Tremolo Reverb Channel produced?

The Supro S6651 - Tremolo Reverb Channel was produced 1962–1968.

Supro S6651 - Tremolo Reverb Channel preset

Verified · 83/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Supro S6651 is a mid-range combo from Valco's Supro lineup featuring tremolo and reverb, offering the raw American tube tone the brand is known for with added modulation effects. The 6973 output tubes give it a smooth, slightly compressed character that sits well in a mix for both clean playing and pushed overdrive. It represents the fully-featured side of Valco's amplifier range from the mid-1960s.

Years produced: 1962–1968
Made in: USA
Wattage: 25W
Channels: 2
Preamp tubes: 2× 12AX7
Power tubes: 2× 6973

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.