Tube Power Amplifier

Dynaco Stereo 70 Stereo Tube Power Amplifier ST-70

Dynaco Stereo 70 Stereo Tube Power Amplifier ST-70
Dynaco Stereo 70 Stereo Tube Power Amplifier ST-70
Dynaco Stereo 70 Stereo Tube Power Amplifier ST-70
Dynaco Stereo 70 Stereo Tube Power Amplifier ST-70
Dynaco Stereo 70 Stereo Tube Power Amplifier ST-70
Dynaco Stereo 70 Stereo Tube Power Amplifier ST-70
Dynaco Stereo 70 Stereo Tube Power Amplifier ST-70
Dynaco Stereo 70 Stereo Tube Power Amplifier ST-70

Dynaco Stereo 70 Stereo Tube Power Amplifier ST-70
Up for sale is a nice Dynaco Stereo 70 all-tube stereo power amplifier. Unit is not fully restored, but it has been through the lab for outfitting and a complete checkout. This appears to be a kit-built amp (as most were) and had some work done before it came to me. The four main coupling caps on the driver board were replaced and a pair of filter caps has been added to the three-section main filter cap.

The remainder is substantially stock. I'm guessing it has not had a lot of use since the choke is still in good condition with no insulation'leakage'.

I installed four new output tubes which are a matched quad of JJ's from Tube Deport. The preamp/driver tubes are a pair of NOS JAN 6U8's each mounted in a pin-adapter that plugs into the 7199 sockets. The rectifier is a Sino GZ34. Following cleanup and miscellaneous work, performance was checked.

Bias is set to 1.45 V at 120 VAC. Distortion was checked at 26/26 watts output and measured L=. At higher power of 34/34 watts output, distortion was L&R=0.15%. Signal to Noise was L=-85db, R=-81db.

There is minor, but extensive, small surface rust on the chassis. The cover is in good condition (no dents) and its paint is good. The unit idles at 1.4A when the Variac is set to 122VAC. As with all the equipment I sell, this amplifier is guaranteed. It neither of us any good if you are unhappy!

Thanks for looking and if you have any questions, please let me know! This item is in the category "Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps". The seller is "radiomandave" and is located in this country: US.

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, United Arab Emirates, Qatar, Kuwait, Bahrain, Republic of 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, Macau, Martinique, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion.

  • Brand: Dynaco
  • Type: Power Amplifier
  • Model: Stereo 70


Dynaco Stereo 70 Stereo Tube Power Amplifier ST-70