Estimated price (community-sourced)
Around — community and catalog average, updates slowly
About the ST70
The Dynaco Stereo 70 (ST-70) is a classic vacuum-tube stereo power amplifier introduced in 1959 by Dynaco and also sold in Dynakit form for user assembly. Designed by David Hafler, it uses a push-pull ultralinear Class AB output stage with four EL34/6CA7 power tubes and delivers approximately 35 watts per channel. Its combination of wide bandwidth, low distortion, selectable speaker-load taps, serviceability, and relatively compact size made it one of the most widely used and influential tube amplifiers in HiFi history. The original model is distinct from later Series II and Series 3 products. Original production has ended and the amplifier is now a vintage product; surviving examples may have been modified or restored, so performance can vary substantially with tube condition, capacitors, transformers, and circuit updates.
Specifications
Power Specifications
Amplification power output and characteristics
- Power @ 8Ω
- 35W @ 8Ω
- Power @ 4Ω
- 35W @ 4Ω
- Amplifier Class
- tube
- Minimum Impedance
- 4Ω
- Input Sensitivity
- 1.3V RMS
Analog Output
Analog signal output specifications
- THD
- 0.025%
- SNR
- 90 dB
Connectivity
Input and output connections
- Digital Inputs
- RCA
- Analog Inputs
- RCA
- Analog Outputs
- barrier-terminal outputs
Physical Dimensions
Size, weight, and appearance
- Dimensions
- 431 × 190 × 235 mm (W × H × D)
- Weight
- 14.5 kg (32 lbs)
Key Specifications
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions