Vintage Tube Amp

Custom Build to Order. / Pre-Order COVERS ARE OUT OF STOCK UNTIL FURTHER NOTICE. Stereo 35 Dynakit Tube Amplifier / Dynaco ST-35 power. BRAND NEW DYNAKIT STEREO 35. COVERS ARE OUT OF STOCK UNTIL FURTHER NOTICE. The Stereo 35 is a classic and was always a very clean sounding amplifier, even earning itself the nickname The Poor Mans McIntosh. This is an all new Stereo 35 that has been specially built to exceed all of the original specifications, performance, and reliability, along with providing improved functionality. Now, here’s the question, do you really want an amplifier that sounds and looks 50 years old? Romantic, nostalgic, sure, practical? Keep in mind that an original condition 50 year old tube amp is going to sound 50 years old, not like it did new, 50 years ago. If that is really what you want, that’s fine, this one probably isn’t what you’re looking for. This amp is brand new, 100% new, and needs nothing, it sounds, works and looks far better than any Stereo 35 ever did 50 years ago. By using higher quality components with a few additional features this amplifier raises the bar. The original Stereo 35 did not use a power supply filter choke. It was proven that the noise floor of the amp could be lowered even further by its use so a Dynakit C-354 shielded choke was installed in place of the ceramic power resistor. This amp is absolutely dead quiet, no hiss, no hum, just crystal clear music is all you hear. The original design used a non adjustable cathode bias circuit. This amp now has user adjustable bias, all four output tubes can be individually biased using the innovative and proven Adjustable Fixed Bias Control Upgrade by Dynakit. The original Stereo 35′s did not have a power switch so a 6 amp toggle switch was added neatly on the back side of the chassis. An inrush current limiter (CL90) has been incorporated to regulate and soften the power on process, this feature helps protect the tubes and extends component life. This amplifier is entirely wired with silver plated, stranded, Teflon coated wire and every connection was made with Cardas Audio Quad Eutectic Silver Solder, a very high quality solder made with a proprietary blend of silver, copper, tin & lead. The original Stereo 35 amps have a cadmium plated metal chassis which has a rather dull shineless finish. This new chassis is heavy duty (non-magnetic) type 304 mirror finished stainless steel with durable black epoxy silkscreen lettering. The perforated cover is finished in Satin Black. Four 1/2 tall rubber feet were installed for better isolation and improved chassis ventilation. The upgraded power cord looks great, it has a black woven nylon covering the wire and has a factory molded on right angle offset plug. Each channel uses its own discrete amplifier board , these are Dynakit PC-13 boards, theyre made in the USA. These heavy duty boards faithfully reproduce the original and brilliant Dynaco Stereo 35 circuit, layout and color, they’re made to military specs using modern materials of the highest quality. The stereo separation this unique design provides is amazing. These circuit boards are populated with special high precision audio grade metal film resistors and excellent sounding high quality audio grade capacitors. The boards have upgraded QQQ and Cinch black tube sockets. The resistors are made by PRP rated at 1% tolerance and specifically designed for high end audio applications, these ensure the signal circuit is quiet and accurate. The capacitor selection consists of (6) Cornell Dubilier Silver Mica, (2) Illinois Capacitor. Original capacitance (uf/mfd) values were kept as recommended to avoid creating low-frequency instability. The K42Y-2 paper in oil caps really smooth things out nicely, giving this amp that wonderful creamy smooth yet detailed sound. These 4 caps were also hand matched to within. 1% of each other. The screening tolerances were tightened for improved sonics and voltage ratings were increased for higher reliability. The tighter screening tolerances of the resistors and these excellent capacitors help give this amp its great ability to reproduce complex musical passages in superb detail while keeping all the magic and smooth musical warmth you want. This approach would not lend itself to guitar amplification but works wonders in a HiFi application. Great sound comes from great circuit design, not magic parts. Having high quality parts in a great circuit simply enhances the already good design. This amp obviously holds great advantage over a new unmodified or original condition ST-35. The warmth, depth and detailed sonic range of this amps soundstage are incredible. There are a factory fresh pair of superb sounding ECC832 / 7247 preamp tubes by JJ Electronic that were gain matched using an Amplitrex digital tube tester. In the Dual Triode 7247 tube, section 1 of the tube is the high gain 12AX7 (gain factor=100) and section 2 is the low gain 12AU7 (gain factor=20). This is an asymmetrical tube so it will not be “balanced” when tested due to the two different tube types combined together in a single tube. Again, each 7247 tube contains two dissimilar triodes. This tube is especially suited for applications requiring a high voltage amplifier and a cathodyne type phase inverter like with the ST-35 amplifier. The dual triode circuit is just one of the many secret weapons this amp uses to generate such exceptional sound. This amp has four brand new Tung Sol 6BQ5 / EL84 output tubes, platinum matched by plate current using an Amplitrex digital tube tester. The Bias Balance Bias Control: Output is kept in check by the the Dynakit Fixed Bias Control Unit. This is an upgraded feature and is not found on the original or new stock Stereo 35 amplifiers. The ST-35 Bias Control Unit (BCU) is a fantastic power circuit modification from Dynakit which permits adjustment and control of the bias setting for each of the 4 (EL84/6BQ5) output tubes via (4) separate on board precision adjustment pots. The BCU circuit board has Vishay, Xicon and NTE precision metal film resistors, high quality Nichicon capacitors and Vishay brand trimmers. The BCU board is constructed from type III, 240 degree C rated Brown Polyimide material with (PTH) plated thru-holes and double sided solder mask. It was carefully designed to fit in nicely and also match the amplifier boards in appearance. This is a well engineered and desirable upgrade that greatly extends tube and transformer life while also creating a stable balanced output and overall more efficient operation throughout the amplifier. This tightly balanced and controlled output ensures circuit stability which in turn improves sound quality. The BCU also allows for the use of unmatched output tubes to be used as those can now be individually biased for a balanced draw and output by adjusting the BCU. This Stereo 35 amplifier uses solid state diode rectification as did the original design. The correct 60/40/20/100 multi section power supply filter capacitor is also new from Dynakit and quality made in the USA. The heart and soul of any tube amplifier are its transformers. The new PA-774 power transformer and matching Z-565 output transformers are exceptional quality Dynakit transformers that meet or exceed the quality and performance of the originals and they’re made in the USA. The Z-565 output transformers use M-6 grain oriented laminations and they are interleaved wound just like the originals. With these new Z-565 transformers, this ST-35 will accommodate a pair of either 4 or 8 ohm speakers making it much more compatible for use with modern speakers than the 8 and 16 ohm design of the original Z565 transformers. The new PA-774 power transformer is wound for today’s real world 120v + line voltage as opposed to the originals which were wound for the 112-117v of the early 1960′s. A huge and convenient improvement which allows this amp to operate directly from a standard wall outlet without the need of a voltage reducing device. Another big improvement is the fact that the PA-774 incorporates Class “B” insulation & wiring which is better designed to handle significantly higher operating temperatures. Based on findings from a tear down and close inspection of some number of original production Dynaco PA-774 power transformers, it was concluded that all of these old units were of a Class A design with a maximum operating temperature of only 221 degrees Fahrenheit. The new production PA-774 units are designated as “B” classification, a NEMA Class 150 C design having a maximum operating temperature of 302 degrees Fahrenheit. The bottom line is the new production Dynakit power transformers are designed to handle measurably higher operating temperatures than the original Dynaco power transformers resulting in near zero failures, extended service life and enhanced durability. The power transformer is mounted on rubber isolation bushings. So what about all the fuss made over those magic cloth lead transformers? The truth here is theres no magic in those cloth lead wires whatsoever. Those old cloth covered leads indicate early manufacture (pre-1970) and many of those old transformers are in fact better quality than their new production counterparts and replacements. This is certainly NOT the case with the new Dynakit transformers which incorporate the latest design advancements in metals, insulation, resins and construction. The results of this well executed transformer design and painstaking production effort are quieter and cooler operating transformers which effortlessly provide increased performance over the originals. This is an amp for even the discriminating audiophile. Here’s what the renowned tube amp guru Bob Latino had to say a while back about the Stereo 35: Many feel, and I concur, that this little amp, within its power range, is probably the best sounding all stock power amp that Dynaco ever put out. Only 17.5 watts per channel but, even unmodified, a very clean sounding 17.5 watts. EL84 output tubes, an all triode driver system and a solid state rectifier gave this little amp excellent frequency extension and very low distortion figures. My thoughts are that if Bob Latino says that, and many others agree with him, that you will be convinced as well. This legendary little amp goes beyond its call of duty, it is truly a listening pleasure and it is built to last. So if you have been looking at Dynaco 35s you can easily see the difference in those offerings and this one. Consider the cost and work involved to bring an original condition amp up to reliable, safe and excellent sounding condition. Again I pose the question: Do you really want an amplifier that sounds and looks 50 years old? Keep in mind, an original condition 50 year old amp is going to sound 50 years old, not like it did new, 50 years ago. If you’re undecided here are a few more points to consider regarding Dynaco/Dynakit. Affordable and readily available parts. A great variety of upgrades. The ongoing and active online community of Dynaco enthusiasts. Ease of repair and service if needed. Dynaco and Dynakit products hold a special place in the HiFi Audio industry regarding these important aspects and in fact, are. Unrivaled by any other brand for support, parts availability and serviceability. You can own, enjoy and use this amp with confidence. A numbered pictorial for quick easy tube installation is included, all you’ll need is a screwdriver for removing the cover. Includes the printed Dynakit Stereo 35 assembly and operating manual stamped with the serial number that belongs specifically with this unit along with other supplemental documentation referencing the wiring, transformers, circuit boards, parts, bias instructions etc. Im always happy to answer any questions you may have. 1963 statement from the Dyna Company. The Dynakit Stereo 35 is a dual power amplifier of deceptively simple appearance and circuitry. Behind its seemingly conventional design is an extremely sophisticated circuit configuration representing the most recent advances in power amplifier engineering and construction. This high degree of technical refinement, combined with the conservative use of premium-grade components, has resulted in a typical Dynakit design offering superb performance at low cost. Each of the two channels in the Stereo 35 is rated as a 17.5 watt amplifier. As a result, the Stereo 35 can, if necessary, duplicate the sound intensity of amplifiers with much higher power ratings when called upon to do so. The heart of the Stereo 35 is the special Dynaco Z-565 output transformer, a patented design tailored specifically to this circuit. The transformer is free of resonances, has extended frequency response (from 6 to over 60,000 cycles), and is wound by special techniques on a carefully designed core to insure low distortion over a wide frequency spectrum. Each unit is custom, a hand built, made to order unit. Your unit will look identical but wire color and routing may be slightly different from unit to unit, these are hand built units. Turnaround time is 3 weeks or less. Photos and progress notes direct from me. Straightforward simple business here. Issues from abuse, misuse, neglect or external damages are not covered. Signs of tampering or repairs by anyone other than. Damage from moisture of any kind, electrical surges, lightning and static electricity are not covered. Coverage is limited to replacement. Of any original components which have failed under normal operating conditions. Faulty components will be replaced with no charge to you for parts or labor. Tubes are not covered. Properly Packed and Double Boxed / Always Insured. The item “Dynakit Stereo 35 Amp Dynaco ST-35 / 7247 Tube Power Amplifier New not Vintage” is in sale since Tuesday, August 11, 2020. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “funtastic-vintronics” and is located in Coweta, Oklahoma. This item can be shipped to United States.

• Model: Dynakit
• Country/Region of Manufacture: United States
• Type: Power Amplifier
• MPN: Stereo 35 / ST-35
• Brand: Dynaco