What tubes does the Park 20Wt 1231 use?

The Park 20Wt 1231 uses ECC83 preamp tubes and EL34 power tubes.

When was the Park 20Wt 1231 produced?

The Park 20Wt 1231 was produced late 1960s–early 1970s.

Park 20Wt 1231 preset

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

The Park 1231 is a 20-watt tube amplifier head built by Park (Marshall's subsidiary) in the late 1960s to early 1970s. It shares the circuit topology of Marshall's lower-wattage offerings of the same period, using a pair of EL34s in a push-pull output stage for a punchy, harmonically rich tone that breaks up earlier than its 50- and 100-watt siblings. Park's 20-watt heads have become sought-after by collectors who appreciate the Marshall DNA at a lower-profile price.

Years produced: late 1960s–early 1970s
Made in: UK
Wattage: 20W
Channels: 2
Preamp tubes: ECC83
Power tubes: EL34

Tags: british.

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.