What tubes does the Selmer Selectortone Automatic 25 use?

The Selmer Selectortone Automatic 25 uses 2× ECC83 preamp tubes and 2× EL34 power tubes.

When was the Selmer Selectortone Automatic 25 produced?

The Selmer Selectortone Automatic 25 was produced 1963–1967.

Selmer Selectortone Automatic 25 preset

Verified · 84/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Selmer Selector Tone Automatic was a 25-watt combo featuring automatic or preset tone-selection capabilities, building on the Selector Tone concept with added automation. Its valve circuit and tone-switching approach distinguished it from the more conventional amplifiers in Selmer's range. The design reflected Selmer's willingness to incorporate unusual features that set their amps apart from simpler British competitors.

Years produced: 1963–1967
Made in: UK
Wattage: 25W
Channels: 2
Preamp tubes: 2× ECC83
Power tubes: 2× EL34

Tags: british.

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.