Vintage Dynaco ST-70 Dynakit Stereo 70 Tube Power Amplifier EL34 HIFI Amp ST70. This is working, 2 new switches were just replaced. Brought up on a variac, tested and working. In very nice condition. Comes with cage, all tubes etc. Out of a collection of Vintage Tube, Solid State and rare electronics. Please visit our store as we get vintage electronics of tube, test, solid state, hifi, audio, etc Many great and rare items as well. Some of the electronic part/s may continue for another 50 years without need of replacement and some electronic part/s may fail a few days after you start using the item. David Hafler and Ed Laurent founded the Dyna Company (later Dynaco) with the intention of not only producing transformers, but high-quality audio circuitry. The company was incorporated in October 1955, with business premises located at 617 N. 41st St in Philadelphia. Dynacos first product was the Mk. II 50-watt power amplifier. Available as a kit or pre assembled unit, the Mk. III amplifier, which produced 60 watts. Dynaco continued to build both mono and stereo amplifiers until 1977. The companys final contribution to vacuum tube technology was the massive Mk. VI mono power amplifier of 1976, which produced 120 watts (continuous). Dynaco is best remembered for its highly regarded vacuum tube stereo amplifier, the Stereo 70 (ST-70). Introduced in 1959, the ST-70 was available as a kit (Dynakit) intended for assembly by the purchaser or as a complete factory-wired unit (Dynaco). The ST-70 used four EL34 output tubes, one GZ34/5AR4 rectifier tube, two 7199 input (driver) tubes, two output transformers, one power transformer, and a pre-assembled printed circuit board (PCB) containing the driver circuit. It produced 35 watts per channel. The driver circuit had a single 7199 pentode/triode tube per channel, and used the driver tube to handle both voltage amplification and phase splitting. The output transformers are an ultra linear design, whereby part of the primary winding is fed back to the output tubes screen grid. This design reduced distortion and improved audio quality. A masterpiece of efficient circuit design, the ST-70 provided reliable, high-quality audio amplification at an affordable price. The popularity of the ST-70 contributed more than any other single product to continuing consumer interest in tube-based stereo amplifiers at a time of increasing market dominance by solid state audio products. Because of its excellent value for cost, Dynaco tube amplifiers were often referred to as the poor mans McIntosh. The item “Vintage Dynaco ST-70 Dynakit Stereo 70 Tube Power Amplifier EL34 Working” is in sale since Thursday, October 14, 2021. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “middlemansalesandauctions” and is located in Ellenville, New York. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, Sweden, South Korea, Indonesia, Taiwan, South africa, Belgium, France, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, New Zealand, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Uruguay.
- Model: Dynakit Stereo 70
- Modified Item: No
- Country/Region of Manufacture: United States
- Custom Bundle: No
- Featured Refinements: Vintage Stereo Vacuum Tube Amplifier
- Type: Power Amplifier
- MPN: ST-70
- Brand: Dynaco
