What tubes does the Lectrolab R400 use?

The Lectrolab R400 uses 12AX7 preamp tubes and 6V6 power tubes.

When was the Lectrolab R400 produced?

The Lectrolab R400 was produced 1958–1963.

Lectrolab R400 preset

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

The Lectrolab R400 occupies the mid-range of the Lectrolab amplifier family, providing a balance of power and portability for club and small-venue use in the early 1960s. Its circuit shares the Lectrolab family topology of dual 6V6 or 6L6 output tubes feeding a single speaker, with a straightforward treble/bass tone stack. The R400 was among the models most frequently rebadged by mail-order and department-store brands seeking an affordable, domestically produced amplifier product.

Years produced: 1958–1963
Made in: US
Wattage: 18W
Channels: 2
Preamp tubes: 12AX7
Power tubes: 6V6

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.