Dynaco stereo 70 manual stereo power amplifier kit. Stereo 120 had an electronically regulated power supply and larger power transformer. Its early popularity was due to a reasonable price coupled with good quality iron and a sound seemingly liked by all. Id imagine that the venerable dynaco st70 is the most well recognized tube amp in the world. The easiest way to repair and restore these amps is start from the bare chassis and rewire the whole thing using new stranded wire. I dunno if i was to buy a stereo 70 these days, i may just keep the circuit stock, but just change the electrolytics out and upgrade the bias supply. In the case of the dynaco st70 for example see attached schematic.
Dec 06, 2014 the st 70 is a great relatively inexpensive introduction to what tubes can do and it gets you about 75% to true audio nirvana that last 25% is quite a slog, cant say ive completely made it there. I plan on doing some of the necessary upgrades, but keep it as original as realistically possible. Dynaco st70 6gh8 6gh8a ecf82 driver board pcb pc3 kit. Dynaco st70 series 3 advanced classic tube aplifier. If, as you say, you want to find the bestsounding affordable tube gear, the new stereo 70ii should have lit your fire. Dynaco stereo 70 manual stereo power amplifier kit hifi.
The dynaco st70 series 3 tube amplifier is now finally. The price is 30x its original retail, but we think this is a steal for someone that wants to put a cherry on their audio collection by. Later versions, especially with the black cage had a fancy dynaco logo on the chassis and cage. It was arguably the best selling power amplifier of all time, and is arguably the most maligned such device as well. Unfollow dynaco st 70 to stop getting updates on your ebay feed. Worse, direct replacements are both expensive and offer no improvement. Below you will found our manuals on the dynaco st 70. The dynaco st 70 series 3 tube amplifier is 35 watts per channel and switchable between both 4 and 8 ohm outputs, with classa pushpull stereo topography, that has long been characterized as a robust, reliable design of exceptional value. Follow any comments here with the rss feed for this post. Arc offered kits, to remake the st 70, using only the chassis and transformers. Over 300,000 of the st70s were produced, and more continue to be built as kits from companies like tubes4hifi and triode electronics. Dynaco stereo 70 kit your eyes are not deceiving you. Restoration module this is an exact replacement for the original dynaco pc3 board fabricated from milspec materials. I compared it to a scott lk150 in the past before the upgrade the lk150 stock sounded much clearer and more transparent.
The money would be better spent in another amp altogether. The venerable dynaco stereo 70 by dan schmalle from valve issue 3, march 1994 said to be the most popular tube amplifier ever made, the dynaco stereo 70 has been around for over thirtyfive years. The original dynaco stereo 70 is a true classic that is still regarded with awe by audio enthusiasts worldwide. Founded by david hafler and ed laurent in philadelphia, pennsylvania in 1955, dynaco was an american hifi audio system manufacturer popular in the 1960s and 1970s for its wide range of affordable, yet high quality audio components its best known product was the st70 tube stereo amplifier. This entry was written by admin, posted on may 29, 20 at 3. Its mounting holes and connections points are identical to the dynaco pc3 making installation and wiring a snap. Dynaco stereo 70 series ii amplifier manual created date.
One of the reasons for its popularity has been the wide array of modifications offered for the 70. He is heading to a retirement village and cant take it along. It doesnt get more classic than a dynaco stereo 70. The amplifier modules are built on high quality 2layer fr4 pc boards. Overall i am in love with the new sound of my st70. The original stereo 120 crossover distortion harmonics are down 6070 db. These amps smoked the dynaco from the beginning of the bandwith to the last and final note. In 1959, dynaco embraced the stereo revolution with the stereo 70.
This board is a must for any serious restoration of the dynaco stereo 70 to full stock condition. With production starting in 1959, by the late 1960s hundreds of thousands of dynaco stereo 70 power amplifiers were in use worldwide, more than any other stereo power amplifier. Youll get one pcb, all resistors and capacitors, two ceramic tube sockets and one matched pair two tubes of nos 6gh8a. Download the dynaco st70 manuals for free hifi manuals. This board is a must for any serious restoration of the dynaco stereo70 to full stock condition. A custom dynaco st70 kit diy audio electronics from. Introduced in 1959, the st70 was available as a kit dynakit intended for assembly by the purchaser or as a complete factorywired unit dynaco. Go a bit furtherimproved power supplies and better inputdriver stagesand a modified stereo 70 can embarrass most of whats out there in the subthou solidstate world. View and download dynaco stereo 70 owners manual online. The dynaco st70 amps were available in either factory built or in kit form. On another note it wasnt until the upgrades that i started to notice the limitations of the dynaco 70. Which dynaco st 70 mod 2channel home audio the klipsch. You could built it yourself or buy one complete but this 35 watt per channel amp changed audio. All parts needed for a complete upgraded dynaco st70 type kit except for the tubes.
Legendary dynaco st70 has been relaunched the absolute. Said to be the most popular tube amplifier ever made, the dynaco stereo 70 has been around for over thirtyfive years. The st70 used four el34 output tubes, one gz345ar4 rectifier tube, two 7199 input driver. Dynaco stereo 70 completed rebuild classic tube audio. The schematic is a technical drawing or diagram of your system, a perfect supplement to the service manual. Apr 17, 2012 but the original sound had more character. The st 70 used four el34 output tubes, one gz345ar4 rectifier tube, two 7199 input driver. The unit contains two 40 watt amplifiers on one chassis with a common power supply. Dynaco st 120 upgrade info ive got a question in to them, for some details but after spending some time on the site, im pretty sure ill go ahead w updating my dead stereo 120 as well. All the parts are through hole no surface mount parts, and the pc card is. There is a difference between the two amps besides the transformers. Tube replacement for dynaco st 70 audiogon discussion forum. Dynaco st70 tube amp, upgraded, improved, restored, ex sound, usa, fresh tubes. We have a new in box, unopened dynaco stereo 70 kit from 1963.
Find the right dynaco parts to restore, repair or upgrade your original dynaco vacuum tube amplifier. Dynaco stereo 80 manual stereo power amplifier hifi. The dynakit stereo 70 is a complete dual 35 watt power amplifier kit which offers the highest possible fidelity, at low cost and in a compact arrangement. Dynaco stereo 70 ii power amplifier manufacturers comment. My uncle had the stereo 120, pat4 preamp, fm3 tuner, and a25 loudspeakers.
Arc offered kits, to remake the st70, using only the chassis and transformers. Unfollow dynaco stereo 70 to stop getting updates on your ebay feed. The heathkits have solid state rectification where the dynaco is tube rectified. Dynaco st70 6gh8 6gh8a ecf82 driver board pcb pc3 kit dyna. Restoration manual, owners manual dynaco stereo 70 restoration manual 20 pages. Today, dynaco is best remembered for its highly regarded vacuum tube stereo amplifier, the stereo 70 st 70. In fact, the stereo 70 has gone on to have a life of its own long after the.
If one wants good high frequency performance then one must have very small output. The st70 is a great relatively inexpensive introduction to what tubes can do and it gets you about 75% to true audio nirvana that last 25% is quite a slog, cant say ive completely made it there. Dynaco pas 3 stereo tube preamp wphono new 12ax7 tubes tested 1910. Pa060s power transformer nearly twice the lamination stack size of the original, a470s output transformers, c354 choke. If the dynaco st 70 is great, then the heathkits are world class.
I built one of these about 4 years ago and foolishly sold it. The ava enhanced pure vacuum tube amplifier for your original dyna st70 chassis. The st70 series 3 marks the introduction of a third generation of vacuum tube products bearing the dynaco name. Download the dynaco st 70 manuals for free hifi manuals. Well known as the bestselling tube amp of all time, the iconic dynaco stereo 70 amplifier has been revamped and redesigned in a series 3 model in the relaunched hafler dynaco line, now under the auspices of radial engineering ltd. One of the most frequent failures in the dynaco st70 is the original quad electrolytic capacitor. Our st70 kit is one of the best stereo tube amps of all time. Dynaco is best remembered for its highly regarded vacuum tube stereo amplifier, the stereo 70 st70. The m60 mkiii c3 amp was a redesign of the dynaco mkiii. The dynaco stereo 120 was the first powerful 60 wattschannel transistorized stereo power amplifier in wide production. Many of you have requested that we develop modules to upgrade the existing dynaco design as opposed to our complete modification package.
We also offer an array of new select dynakit classic vacuum tube amplifier kits based on the. These shipped complete so everythings in there including the original mullard el34s. The underside of the dynaco st70 chassis with all parts now removed. The dynaco or dynakit stereo 70 also known as the st 70 vacuum tube amplifier was one of the most popular tube amps of its time. Soi will, one way or another, keep this little legacy going.
The kit seems well thought out and seems to be a bargain to me. Following is the frequency response of a professionally upgraded st70 with the. Dynaco stereo 70 series ii amplifier manual keywords. Our offerings have the most requested upgrades we sell, built right in. May 09, 2016 dynaco senior engineer dan fraser explains. Introduced in 1959, the st 70 was available as a kit dynakit intended for assembly by the purchaser or as a complete factorywired unit dynaco. The dynaco st70 surely must represent the greatest amplification paradox of all time. It was introduced in 1959 and was sold until mid1990. For a generation who adored it, there have been those in following generations who are quite vocal about it, to the point that the only. Why start with an amp you have to mod, when ours comes fully loaded.
Introduced in 1959, the st 70 was available as a kit dynakit intended for assembly by the purchaser or as a complete factorywired unit. They also manufactured other tube and solid state amplifiers, preamplifiers, radio tuners and. I am really just talking about the feasibility of throwing another whole run of upgrades into the dynaco stereo st 70, which he just upgraded. All parts needed for a complete upgraded dynaco st 70 type kit except for the tubes. Our famous original dyna st70 rebuild plans by frank van alstine.
Comments are closed, but you can leave a trackback. Including our custom made transformers, which are made to original specs right here in the usa. The dynaco st 70 surely must represent the greatest amplification paradox of all time. Below you will found our manuals on the dynaco st70. To add confusion to all of this, over the years the power transformer also changed. The tubes4hifi recreates the chassis exactly as it was aside. They sounded great, to my amazement though, my dynaco stereo 70 produced a deeper soundstage and had a bit more midrange clarity. It just does not put out enough punch and power for the klf 30s. The dynaco or dynakit stereo 70 also known as the st70 vacuum tube amplifier was one of the most popular tube amps of its time. Jun 28, 2016 dynaco is best remembered for its highly regarded vacuum tube stereo amplifier, the stereo 70 st 70. The dynaco stereo 80 is an all silicon transistor basic power amplifier for use with separate preamplifiers such as the dynaco pat4 or pat5 or for use with tape recorders or tuners such as the dynaco fm5 which have their own volume controls. And in the 1990s, about 25 years after their heyday, there were still many thousands in use internationally. Legendary dynaco st70 has been relaunched the absolute sound.
Updatemydynaco makes audiophile kits that make your dynaco stereo 120 power. Stereo 70 owners manual full stereo 70 repair guide. Dynaco stereo 70 manuals manuals and user guides for dynaco stereo 70. After all, every major audiophile publication in the world has rated the st. The easiest way to repair and restore these amps is start from the bare chassis and rewire the. The pc board has been carefully routed and optimized with advanced circuit. Dont get me wrong, the mcintosh 240 is a wonderful amp with a superior build quality and measures better than the dynaco at the frequency extremes. It uses the 7199 circuit from the original it is not a redesign using the inferior 6gh8. In addition, we offer an array of new select dynakit classic vacuum tube. I have to say i enjoyed the upgraded sound more than the stock sound, which i found a bit too warm and fuzzy along the edges.
Hard to find parts including dynakit original dropin replacement components typically ship within 24 hours of ordering. The phono preamp upgrade kit increases signal to noise ratio by between 4 and 8. Unfollow dynaco st70 to stop getting updates on your ebay feed. This dynaco st 70 driver board pc3 has been developed and designed to be a dropin replacement for dynaco 7199 board. Here at dynakit you will find the right parts to restore, repair or upgrade your original dynaco vacuum tube amplifier. You can get seriously highend sound out of your dynaco stereo 120 power amp, pat4 preamp, or sca80 integrated amp. Dynaco stereo 80 manual stereo power amplifier hifi engine. In fact, there are tens of thousands of the original dynaco tube amplifiers still in use around the world. It uses a patented circuit of outstanding performance characteristics, along with top quality parts, including the new dynaco superfidelity a470 transformers the finest available. The owners manual is used as an reference guide, instruction manual and instruction book. It follows the original wire hole layout, but it was modified to use widely available 6gh8 6gh8a 6kd8 ecf82 tubes instead of the obsolete and hard to find 7199 tubes. Most were kits and 90% of the ones i have seen were assembled by amateurs that did a terrible job of wiring and soldering.
We have 3 dynaco stereo 70 manuals available for free pdf download. The early dynaco logo said dynakit stereo 70 on the chassis and cage. Everything driver, bias supply, quad cap, filters is included. Dynaco st 120 upgrade info techtalk speaker building. The venerable dynaco stereo 70 by dan schmalle from valve issue 3, march 1994. Imagine what wed have had, back then, if hafler and johnson had formed a company. Improve, renew, restore and repair your dynaco stereo 120, stereo 80, stereo 400, pat4, pat5, fm5 or af6 tuner, or sca80q highend sound on a budget. This kit will replace the original dynaco driver circuit and printed circuit board, using the excellent sounding 6sn7 triode. Btw, one of my clients is the owner to all the acrosound dynaco iron tooling, papers, patents magnequests mike lafevre who i have talk with. First is our stereo70 upgrade system on board sob a complete amplifier on pc board. Dynaco st70 series 3 advanced classic tube amplifier ruckkehr. We like to think of the st70 series 3 as the update that david hafler would have made if he were alive today.
If the dynaco st70 is great, then the heathkits are world class. The stereo 80 was the little brother of the stereo 120. You could built it yourself or buy one complete but this 35 watt per channel amp changed audio forever. You also requested a simple and reliable power supply module.
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