What tubes does the Gibson BR-4 - Instruments use?

The Gibson BR-4 - Instruments uses 1× 6SJ7 preamp tubes and 2× 6V6 power tubes.

When was the Gibson BR-4 - Instruments produced?

The Gibson BR-4 - Instruments was produced 1947–1954.

Gibson BR-4 - Instruments preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Gibson BR-4 was a step up from the BR-3 in Gibson's early postwar amp lineup, offering more power and fuller tone for instrument and microphone use. Like other Brown Register amps of the era, it featured warm, natural tones suited to acoustic and lap steel instruments.

Years produced: 1947–1954
Made in: US
Wattage: 14W
Channels: 2
Preamp tubes: 1× 6SJ7
Power tubes: 2× 6V6

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.