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Vintage 1960s Dynaco Stereo 35 ST35 EL84/6BQ5 amplifier :Pretty much fully electrically restored: New PC13 circuit boards from Dynakit + new multi-cap power supply capacitor (see label in photo - I kept label off for vintage look but it's a brand new capacitor w/ the correct factory values and you can apply the adhesive label to metal "can" if wanted) + new gold plated RCA input jacks + new power supply dropping resistors underneath + new polarized power cord + new power supply rectifier diodes + added a thermistor to soften tube start-up current and drop line voltage just a bit given today's home voltages are a tad higher than in the 1960s.Only non-stock/non vintage mod was I added a power switch on the back - since these amps otherwise have to be turned on/off plugged in to some sort of pre-amp.TWO SETS OF VINTAGE TUBES INCLUDED (gives you a full working spare set !)1) Vintage set of Qty-4 Dynaco Label 6BQ5 tubes labeled 70-09 274 which means they are almost certainly RCA and have the solid disc halos. Qty-2 Dynaco Label 7247 w/ Great Britain labels (probably Mullards). They tested and worked perfect after being in storage for several years.+2) Vintage set of Qty-4 Baldwin Green Label 6BQ5 tubes (almost certain they would be made by Sylvania given their vintage age) and Qty-2 vintage 7247 pre-stage tubes (one is labeled Great Britain and label on other is not totally readable)Amp works perfect w/ no hum or noise or other issues (amp is silent w/ volume all the way down) and x-formers run reasonably cool to touch at temps expected for this type of tube amplifier. Since I don't run this amp all the time - I burned it in on the bench for several hours and it's working great, all voltages check out and plays perfectly as shown w/ MP3 player input in photos.Some very minor wear to the brown cage and bottom metal plate - common for an amp of this vintage and age. Transformers are original Dynaco as labeled.
US$949 is ambitious versus the recent used market: it sits well above the US$750 75th percentile and more than double the US$395 median, so this is priced at the top end rather than as a bargain.
That said, it’s a desirable piece if you want a restored, plug-and-play EL84 Dynaco with tubes already sorted, and these amps have a strong reputation for smooth, musical power and classic vintage charm. The upside is mainly convenience and provenance: if the restoration is clean, the tubes test strong, and the work was done properly, paying a premium can make sense for a ready-to-enjoy example.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Dynaco emerged in 1955 from Philadelphia, Pennsylvania, when hi-fi pioneer David Hafler partnered with engineer Ed Laurent to form the Dyna Company. Hafler brought expertise from his earlier Acrosound venture, which produced high-quality output transformers starting in 1950. The duo targeted the burgeoning hi-fi market with affordable, DIY-friendly kits, launching the Mk II 50-watt tube amplifier shortly after incorporation and relocating to a former chocolate factory for expanded operations.
The brand specialized in tube amplifiers that defined its legacy, including the iconic Stereo 70—over 350,000 units sold—alongside models like the Mk III. Dynaco expanded into FM tuners such as the FM-1, bookshelf speakers like the A-25, solid-state amps, and innovative systems like the Dynaquad for simulated four-channel sound. Late-1970s efforts included the Phase III speakers, though the company shifted toward kits and components emphasizing value and performance.
Dynaco holds a revered position as the era's top-selling tube amp maker, beloved by budget-conscious audiophiles for reliable, high-value hi-fi. Liquidated in 1980 after Hafler's sale to a toy firm, its vintage gear remains a collector's staple, with later revivals by Panor Corporation producing replicas for tube enthusiasts seeking that classic warmth and build-it-yourself appeal.
See all Dynaco listings on RADAR.
