Elk Viking Bass VKB-100 preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Viking Bass VKB-100 is Elk's valve bass head. Two inputs feed half a 12AX7, then treble and bass controls and a volume, the other half of the 12AX7 and a 6BQ5 driver into an interstage transformer. That drives four 6CA7s (EL34) as two push-pull pairs with two output transformers, with global feedback to the second stage, a solid-state bridge rectifier at about 450 V, a separate bias supply and a standby switch.

• Made in: Japan
• Channels: 1
• Preamp tubes: 1× 12AX7
• Power tubes: 4× 6CA7

Tags: japanese, vintage, bass, el34, high-wattage.

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.