Dynaco
The Dynaco posts are few but well chosen. One is a 1960 Stereo 70 from its original owner, with the original 7199 driver tubes and a rebuilt bias supply; another is a complete 1960s system built from kits, with a Stereo 70 power amplifier, a PAS-3 preamplifier and an FM-3 tuner, all with their assembly manuals. The third is the original site's company page.
The Stereo 70 is probably the most common vintage tube amplifier on the used market, which makes condition and history the deciding factors. Look for a rebuilt bias supply, original transformers and tidy kit wiring; a factory-wired unit or a well-documented kit is worth more than an anonymous one.
For the circuit behind the Stereo 70, read ultra-linear explained. For the company, see the Dynaco maker page.
3 entries
Dynaco
Dynaco: High Quality Audio Components
The original Dynaco history page, with the dates it skipped.
Dynaco
Dynaco Amplifier, Preamp and Tuner Set
FM-3, PAS-3 and Stereo 70, built by one owner from kits in the 1960s.
Dynaco
Dynaco Dynakit Stereo 70 Tube Amplifier
A one-owner 1960 Stereo 70 with its original 7199 drivers and a rebuilt bias supply.