Dynaco Dynakit Mark IV preset

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

The Dynakit Mark IV is a 40-watt mono valve power amplifier sold as a kit by Dynaco, with no preamp or tone controls; two were used for stereo. One 7199 does all the small-signal work: its pentode section is the voltage amplifier, direct-coupled to its triode section as a cathodyne phase splitter. That drives a pair of EL34s in ultralinear push-pull on adjustable fixed bias, with global feedback and a GZ34 rectifier.

• Made in: USA
• Wattage: 40W
• Channels: 1
• Preamp tubes: 1× 7199
• Power tubes: 2× EL34

Tags: american, vintage, power-amp, el34, diy, 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.