What tubes does the Selmer Thunderbird Twin 50 use?

The Selmer Thunderbird Twin 50 uses 3× ECC83 preamp tubes and 4× EL34 power tubes.

When was the Selmer Thunderbird Twin 50 produced?

The Selmer Thunderbird Twin 50 was produced 1964–1969.

Selmer Thunderbird Twin 50 preset

Verified · 82/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Selmer Zodiac Twin 50 is a 50-watt British tube amplifier from Selmer London, offering greater power than the Zodiac Twin 30 for larger venues. Using four EL34 output tubes in push-pull configuration, it delivered authoritative British tone with good headroom. As a contemporary of early Marshall and Vox designs, it represents an important but lesser-known strand of 1960s British amplification.

Years produced: 1964–1969
Made in: UK
Wattage: 50W
Channels: 2
Preamp tubes: 3× ECC83
Power tubes: 4× EL34

Tags: british, 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.