What tubes does the Ampeg 835 Bass Amp - Main use?

The Ampeg 835 Bass Amp - Main uses 3× 12AX7 preamp tubes and 2× 6L6 power tubes.

When was the Ampeg 835 Bass Amp - Main produced?

The Ampeg 835 Bass Amp - Main was produced 1965–1968.

Ampeg 835 Bass Amp - Main preset

Verified · 85/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The 835 Bass Amp is a mid-1960s Ampeg bass amplifier offering 35 watts of tube power through a pair of 6L6 output tubes. The main channel delivers the warm, punchy tone characteristic of Ampeg's bass amplifier designs of the era. A solid mid-range performer between the PortaFlex combos and the more powerful B-25.

Years produced: 1965–1968
Made in: USA
Wattage: 35W
Channels: 2
Preamp tubes: 3× 12AX7
Power tubes: 2× 6L6

Tags: bass, american, vintage, mid-wattage, 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.