What tubes does the Sunn Coliseum PA - Channel 3 use?

The Sunn Coliseum PA - Channel 3 uses 4× 12AX7 preamp tubes and 4× 6550 power tubes.

When was the Sunn Coliseum PA - Channel 3 produced?

The Sunn Coliseum PA - Channel 3 was produced 1969–1975.

Sunn Coliseum PA - Channel 3 preset

Close · 75/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The Sunn Coliseum PA is a high-powered tube PA head from Sunn's flagship lineup, capable of driving large speaker arrays. It was used for stadium-scale sound reinforcement in the early 1970s and is prized today for its powerful, clean headroom.

Years produced: 1969–1975
Made in: USA
Wattage: 150W
Channels: 2
Preamp tubes: 4× 12AX7
Power tubes: 4× 6550

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.