Dynaco Amplifier, Preamp and Tuner Set
Archived listing from the original vintage-amplifier.com. Prices, seller details and purchase links have been removed; this page is a reference record, and nothing here is for sale. About this archive.
A complete Dynaco stereo system which my dad built back in the 60s. It includes the Pre Amplifier, Amplifier and Tuner. It is complete and functional.
Dynaco component descriptions
Dynaco fm tuner ( fm-3)
– Four IF limiters, wide band balanced bridge discriminator, time switching multiplex system.
– Automated stereomatic multiplex circuit locks in and signals stereo automatically. Never any problems with recording off the air.
– Self contained multiplex integrator
– 11 tubes and 6 diodes which develops FM’s full potential.
– Cathode coupled tuned RF input and oscillator mixer use slug-tuned coils for easy alignment.
– 55 watts
– 13 pounds | Not used for 25 years | Original assembly manual included.
Dynaco preamplifier (pas-3)
– Equalization accurately controlled with 1% components. Low noise resistors used in all critical stages.
– 30 watts
– 11 pounds
– Not used for 25 years.
– Original assembly manual included.
Dynaco amplifier (stereo 70)
– Full utilization of the performance capabilities of patented Dynaco output transformers.
– Firm, perfectly defined bass and smooth, natural highs. Absolute stability provides a transparency which delineates the most subtle orchestral nuances.
– The Stereo 70 is noteworthy for ultra conservative operation at only 65% of capacity, and filter capacitors at less than 85% of rated voltage.
– 70 watts continuous, 90 watts IHF Music Power. 35 watts each channel
– Power consumption 175 watts
About this model
A complete Dynaco system built by the seller's father in the 1960s: an FM-3 tuner, a PAS-3 preamplifier and a Stereo 70 power amplifier, each with its original assembly manual. This was the classic Dynakit trio of the decade, and buying all three from one builder means the soldering quality is at least consistent.
The listing quotes Dynaco's own catalogue language for each piece: the FM-3 with its time-switching multiplex circuit and 11 tubes, the PAS-3 with 1% equalisation components, and the Stereo 70 at 35 watts per channel, running "at only 65% of capacity". The set had not been used for 25 years, so every capacitor in all three units should be considered suspect.
| Maker | Dynaco, Philadelphia, USA |
|---|---|
| Tuner | FM-3 stereo FM tuner, 11 tubes (listing) |
| Preamplifier | PAS-3 (listing) |
| Power amplifier | Stereo 70, 35 W per channel |
| Built | 1960s, as kits (listing) |
| Manuals | Original assembly manuals included (listing) |
Questions collectors ask
Which Dynaco units made up a typical 1960s system?
An FM tuner such as the FM-3, a PAS preamplifier and a Stereo 70 power amplifier, all available as kits. This archived set is exactly that combination.
Is a kit-built Dynaco worth less than a factory-wired one?
Often slightly, and the value depends on the quality of the original assembly. Original manuals and neat wiring help.
Sources: Wikipedia: Dynaco.
