What tubes does the Dynaco Stereo 70 use?

The Dynaco Stereo 70 uses 2× 7199 preamp tubes and 4× EL34 power tubes.

When was the Dynaco Stereo 70 produced?

The Dynaco Stereo 70 was produced 1959–1977.

Dynaco Stereo 70 preset

Verified · 92/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Dynaco Stereo 70 is a tube hi-fi stereo power amplifier, not a guitar amp. Each side uses a 7199 pentode-triode as voltage amp and cathodyne phase splitter feeding two EL34s in push-pull for about 35 watts per side, with a GZ34 rectifier. It was sold in huge numbers, many as kits, and is often rebuilt or modded as a guitar power amp.

Years produced: 1959–1977
Made in: USA
Wattage: 70W
Channels: 1
Preamp tubes: 2× 7199
Power tubes: 4× EL34

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