First, look at the symbols stamped in the plastic at the base of each. Dynaco st150 vintage stereo verstarkersounds amazing mit. Van alstine mosfet 150 modified dynaco st 150 75 watt per. Dynaco dynakit stereo 70 st70 tube amplifier schematic. Vintage hifi the website offers you the possibility to download.
Dynaco manuals, schematics and brochures hifi manuals. The early version used a bootstrapped resistor in the voltage amplifier stage. The dynaco dynakit mark iii is a monoblock amplifier with a 6an8 input stage and a pushpull kt88 output stage. Dynaco st150 restored, new wood side panels,lower res. The service manual functions as a repair guide for troubleshooting and sometimes contains tips for refurbishing and modifications. The dynaco st70 surely must represent the greatest amplification paradox of all time. This may be a factory wired unit, or if not, the assembly is the same excellent quality. These amps smoked the dynaco from the beginning of the bandwith to the last and final note. Looking for information about your vintage stereo equipment, your vintage amp. It is the very first generation of st120 amplifers that dynaco manufactured. Below you will found our manuals on the dynaco st150. Dynaco st 120 upgrade info techtalk speaker building.
Ive designed a replacement capacitor board for the st70. This site helps you to save the earth from electronic waste. Dynaco kits, pictures, specifications, diagrams, schematics. The tubes4hifi version was done in a similar manner to this.
David hafler released the dynaco st35 twochannel power tube amplifier nearly 50 years ago as a lower cost alternative to the popular st70. Dynaco st150 amplifier restoration kit repair service fix recap. The dynaco st70 series 3 tube amplifier is a modern version of the most popular stereo tube amplifier of all time upgraded for todays hifi enthusiast. This is a great sounding power amplifier for the price. Modified updated dynaco st70 stereo tube power amp,repair,no. The scan below is the dynaco dynakit mark iii tube amplifier schematic from the instructions manual.
The poor sounding electrolytic input capacitors have been replaced with better sounding 15 uf mylar film capacitors. Dynaco dynakit mark iii tube amplifier schematic and manual. Lately the reputation of the st 120 has been rehabilitated. The heart of the stereo 35 is the special dynaco 2565 output transformer, a patented design tailored specifically to this circuit. They include 24 transistors, 2 zener diodes, 16 diodes, and 2 thermal sensors. I should at least have a copy of the schematic for pc36 units if you need one.
Exact replacements for the original can capacitors are dif. At first glance, the shipping box appeared very large for what id consider a smallmedium sized amp. Dynaco st 150 power amplifier the dynaco stereo 150 is a basic two channel power amplifier employing all silicon semiconductors. The owners manual is used as an reference guide, instruction manual and instruction book. Simple 0 to 24 db gain amplifier and balanced line driver 18kb pdf.
It uses the 7199 circuit from the original it is not a redesign using the inferior 6gh8. It was arguably the best selling power amplifier of all time, and is arguably the most maligned such device as well. There is a difference between the two amps besides the transformers. The entire amplifier, except for an input network, is direct coupled. Dynaco owners please comment audiogon discussion forum. The transformer is free of resonances, has extended frequency response from 6 to over 60. Service manuals, owners manuals, schematics, diagrams, datasheets. Schematic diagram alternate ac line connections in case of difficulty service and warranty information 16 28 30. Even so, both the stereo 120 and the stereo 150 remained in production for quite a while. I decided to test things first and i may leave my yummy 2 channel as a yummy 2 channel. The st150 does not have these resistors, does not use the pc28, but the pc43.
If you want to join us and get repairing help please sign in or sign up by completing a simple electrical test or write your question to the message board without registration. Details zu dynaco st150 vintage stereo amplifier sounds amazing w manual print. Output tube changes the original triode electronics board design manual included modifications to this board and to the amplifier to allow using other output tubes in a st70. Specwise this was true, but i always found the st 150 less satisfacory overall. If the dynaco st70 is great, then the heathkits are world class. St70 power supply capacitor board this board replaces the large can capacitor in the power supply section of the dynaco st70 ampli. Review new dynaco st70 series 3 steve hoffman music.
Stereo cassette player 150w audio amplifier circuit. The later dynaco stereo 150 had a more conventional circuit and was touted as a big upgrade. The entire amplifier, except for an input network, is. It is being included here to allow the owner to experiment, and. Legendary dynaco st70 has been relaunched the absolute. Dynaco st 150 power amplifier highperformancestereo. The measured specifications show that the stereo 70 is an amplifier of unequalled performance, and its listening quality is also unrivalled by any regardless of price. Im not the original owner but have played it for about 14hrs so far. You can build a point to point 3886 amp for peanuts and have just as good an amp since that is where the power comes from. Download the dynaco st150 manuals for free hifi manuals. The dynaco stereo 150 is a basic two channel power amplifier employing all. In addition, we offer an array of new select dynakit classic vacuum tube. Ozren bilan room acoustics audio site links audiologs. The original dynaco stereo 70 is a true classic that is still regarded with awe by audio enthusiasts worldwide.
Service manuals, schematics, eproms for electrical technicians. I believe model st150 although i dont see that on it anywhere. It is labelled dynaco a division of panor corp from 1994. Scan of the dynaco dynakit stereo 70 st70 tube amplifier schematic from the instructions manual. Dynaco sca 50 dynaco 4dimensional amplifier they look the same. Dynaco stereo 150 manual stereo power amplifier hifi engine. Not rusty or dinged up badly but one of the wood sides chewed up in a corner. View and download dynaco dynakit st35 instructions for assembly and operation manual online. Dynaco diagrams, schematics and service manuals download for free.
If the page is blank click here original dynaco st70 manual. Q1 2n3904 r4 150 r2 4700 r1 4700 c2 150p c1 5 ac 1 v1 sine0 0. This board is a must for any serious restoration of the dynaco stereo70 to full stock condition. Items must be returned in original, asshipped condition with all original packaging and no signs of use. I have a st400 that i cannot find the trouble but it was a much more powerful amplifier.
Dynaco st150 vintage stereo amplifier sounds amazing w manual print. Van alstine mosfet 150 modified dynaco st 150 power amp approximately 75w channel. Dynaco stereo 150 manual stereo power amplifier hifi. Dynaco vintage hifi service manuals available youtube. Absolute sound labs preformed the restoration of the unit. Ignored for years by many tube enthusiasts, due to modest power output, its become a hot item since the start of the new millennium, with new releases of complete amplifiers, clone boards, transformers, tubes and other parts. They would go into early secondary breakdown and cause all sorts of issues with st150, qsa300, st400 and st410 amps. A very nice looking, straight dynaco st150, this one dials in from sometime, mid production mid 1978. The following was done during the restoration to the unit corrected defective right channel set offset to factory specs set bias to factory specs 4 power resistors replaced 6 capacitors replaced lamps and fuses installed 4 to3 replaced replaced rca inputs. The later version used a current source, as is the custom with most. Dynaco solid state amps steve hoffman music forums. This board replaces the large can capacitor in the power supply section of the dynaco st70 amplifier.
The biggest collection of dynaco manuals and schematics. Dynaco stereo 35 tube amplifier for sale us audio mart. The output circuitry is of the full complementary symmetry design. 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. The el34 output stage is pushpull and the dynakit st70 amplifier is rated at 35 watts per channel.
Up for auction is a fully restored dynaco st150, factory wired, amplifier. The six outputs for the dvda player panasonic rp82 will be routed to my hk amp and two dynaco amps to see what they sound like. The heathkits have solid state rectification where the dynaco is tube rectified. Exact replacements for the original can capacitors are difficult. 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. Visit us online for more information or to download service manuals today. The stereo 150 was a modern style power amplifier that would eventually take the place of the stereo 120. Upgrade component installation on the dynakit st35, part 3. Main issue was loud hissing, crackling and popping thru the speakers even at low listening levels. Restoration module this is an exact replacement for the original dynaco pc3 board fabricated from milspec materials. In fact, there are tens of thousands of the original dynaco tube amplifiers still in use around the world. I opened the shipping box and i find a boxwithinabox.
Hard to find parts including dynakit original dropin replacement components typically ship within 24 hours of ordering. Dynaco stereo 70 st70 amplifier service assembly manual. Triode, usa customer service mf 9am4pm ct 18007743201 email us anytime. Here at dynakit you will find the right parts to restore, repair or upgrade your original dynaco vacuum tube amplifier. The friendly fedex deliverer dropped off a new dynaco st70 series 3 at my home yesterday. Dynaco double boxed the amp, which is a good thing since there is less of a chance of damage. Dynaco st 120 upgrade info the schematic shows one lm3886 chip amp per channel. The dynaco stereo 150 is a basic two channel power amplifier employing all silicon semiconductors.
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