Not to say the 120 was exceptional, just that the st70 wasnt either. 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. I used them with two speakers stacked on a side for years until one of the st 120s died. This entry was written by admin, posted on may 29, 20 at 3. Dynaco stereo 120 manual stereo power amplifier hifi engine. For more information about jims build and his impressions of the st35 kit, see the dynaco st 35 tube amp kit thread on the message forum. This goes for the dynaco st120 and its baby brother, the st80. The high end show 2016 in munich marks the relaunch and advanced design of the newest iteration of. I have a dynaco system consisting of pas3 preamp, fm tuner and st 35 amp my father built in 64 or 65. The transformer is free of resonances, has extended frequency response from 6 to over 60. Classic dynaco sca80q integrated amp just recapped with original box sweet. Vintage dynaco dynakit st70 stereo power amplifier. The heathkits have solid state rectification where the dynaco is tube rectified.
I eventually sold both along with a pat4 but a couple of years ago i decided to get a used st 120 to. Replacing 7199 with 6gh8 and comparing thd in a dynaco st70. 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. Dynaco st 120 upgrade info techtalk speaker building. A few months ago, i refurbished a dynaco stereo 120 audio amplifier for my. Dynaco owners please comment audiogon discussion forum. Find the right dynaco parts to restore, repair or upgrade your original dynaco vacuum tube amplifier. Delivering the sound and performance of amps costing 4 times as much. It is the very first generation of st120 amplifers that dynaco manufactured. We have decades of experience working with the dyna and hafler pieces, and continue to offer our latest. This board is a must for any serious restoration of the dynaco stereo70 to full stock condition. I have a dynaco system consisting of pas3 preamp, fm tuner and st35 amp my father built in 64 or 65.
Dynaco st 120 upgrade info techtalk speaker building, audio. The latest production dyna transformer for the st70 has a larger stack and is designed for the current 120 volt line power. Dynaco vintage tube ampllifier technical articles, upgrade, restoration and repair resources for st70, pas, sca35, st35. Developed over many years, erhard audio is the only and official seller of all these great upgrade kits, spare parts and more. If the dynaco st70 is great, then the heathkits are world class. Upgrade moduleshown installed on the photo to the left all triode fully direct coupled design cascode amplifier with split load phase splitter that preserves the musical midrange of the stock st 70 while significantly improving its bass tightness and high frequency extension over the stock board and dramatically increasing both. Vtg dynaco dynakit catalog 80 120 amp 400 mark iii iii70 iii500. Some have said it sounds overly tubey, but man i am enjoying it i am running it with a ss dynaco pat5 preamp and spica angelus speakers, and they do a good job of bringing out what detail this old, original st70 has to offer. I had this one built 10 months ago with all the upgrades best capacitors attenuation pot so you dont. I own a dynaco st120 that i had upgraded by van alstine here in minnesota. Class d replacement for dynaco st 120 years ago i purchased four dyanco a50 speakers, two pat4 preamps, and two dyancost 120 amps. I built my latino st120 amp 9 years ago and its still running strong. I recently came across dan joffes info online about the updated version for the dynaco 120, and thought it might improve the overall performance of my system, besides the fact i just love. There is a difference between the two amps besides the transformers.
The high end show 2016 in munich marks the relaunch and advanced design of the newest iteration of the dynaco stereo 70 st 70. Despite the lower impedance of the paradigm speakers, the dynaco st 35 coped with it very well. 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. Here is the completed amp, with all of the new capacitors installed. Dynaco stereo 120 repair information update my dynaco. Dynaco st 120 amplifier restoration kit repair service fix recap capacitor. View and download dynaco dynakit st35 instructions for assembly and operation manual online. The unit contains two 40 watt amplifiers on one chassis with a common power supply. The heart of the stereo 35 is the special dynaco 2565 output transformer, a patented design tailored specifically to this circuit. It is obvious the time and care that he has put into the design upgrades that this amp possesses.
Dynaco st120 restored with stainless steele chassis. Dynaco stereo 80 manual stereo power amplifier hifi engine. Follow any comments here with the rss feed for this post. This is the next step up from the original dynaco circuits. The st 35 has output transformer impedances of 8 and 16 ohms.
The sound stage is never ending with a solid 3d imaging. The perfect power tube for the dynaco st70 or vintage marshall amplifiers. Triode, usa customer service mf 9am4pm ct 18007743201 email us anytime. Acme silver plated iec receptacleneotech legenburg cryod upocc internal wiringcardas internal wiring where the rectangular neotech too difficult to work. I can just sit back and pick out each person and instrument on the stage.
If the dynaco st 70 is great, then the heathkits are world class. The dynaco pas23 preamp upgrade kits we offer are the best available on the market. A few years later i stepped up to the st 120 and although some would argue the st 35 was a sweeter little amp the 120 was pretty groundbreaking in its day. We also offer an array of new select dynakit classic. Dec 14, 2016 david hafler released the dynaco st35 twochannel power tube amplifier nearly 50 years ago as a lower cost alternative to the popular st70. 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 st 70 tube stereo amplifier. All parts needed for a complete upgraded dynaco st 70 type kit except for the tubes.
When i got it from him a few years ago it came with the original klh speakers that he used with it. Speaker recommendations for dynaco st 70 2channel home. Both the zpc6 phono and zpc5 line preamps offer vastly improved circuits and performances over the original dynaco designs, with far superior sound reproduction. A customized dynaco st35 kit diy audio electronics from. Dynaco diagrams, schematics and service manuals download for free. A few years later i stepped up to the st120 and although some would argue the st35 was a sweeter little amp the 120 was pretty groundbreaking in its day. Dynaco stereo 120 manual stereo power amplifier hifi. 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. I used it for about 6 months in 1990 until i bought adcom 555 that i traded up to vtl 100 mono blocks. For those that need a little more power is the dynaco vta st 120. It uses the 7199 circuit from the original it is not a redesign using the inferior 6gh8. Comments are closed, but you can leave a trackback. The vta st 120 uses three custom wound usa made transformers and is available as a kit amp or completely wired and tested.
A customized dynaco st35 kit the st35, also known as the stereo 35, was released by dynaco in 1963. I can only say the best things about bob and the product that he produces. A very nice looking, straight dynaco st 150, this one dials in from sometime, mid production mid 1978. It is called a mosfet series d and he uses the case, connectors, power cord, switch and transformer. Class d replacement for dynaco st120 years ago i purchased four dyanco a50 speakers, two pat4 preamps, and two dyancost120 amps. Dynaco stereo 70 tube amplifier dyna st70 el34 amp dynakit good condition. I built this from a kit along with a dynaco stereo 120 power amp. In later years, the company began to produce a line of solidstate audio components, commencing in 1966 with the introduction of the stereo 120 power amplifier. I used one to replace my pair of dynaco mark ivs after performing lengthy comparative listening tests, and deciding that the smaller, cheaper st35 provided inherently superior sound. Developed over many years, erhard audio is the only and official seller of. I have done a search and did not come up with anything.
Despite the lower impedance of the paradigm speakers, the dynaco st35 coped with it very well. Restoration module this is an exact replacement for the original dynaco pc3 board fabricated from milspec materials. I have recently acquired a dynaco st 70 amp that i plan to pair with a bottlehead foreplay preamp i am going to build. You can get seriously highend sound out of your dynaco stereo 120 power amp, pat4 preamp, or. I used one to replace my pair of dynaco mark ivs after performing lengthy comparative listening tests, and deciding that the smaller, cheaper st 35 provided inherently superior sound. Dynaco st 120 upgrade info the schematic shows one lm3886 chip amp per channel. The phono preamp zpc6 as well as the line preamp zpc5 use 2x 12ax7s each. We left the old speaker output capacitors physically in place to preserve the speaker choke coils wound around them. Using biaset is a relatively safe way to set the bias on dyna amps with a digital meter, and some of the latest production dyna boards offer.
The vta st120 is quite the chameleon among power amplifiers. I used them with two speakers stacked on a side for years until one of the st120s died. The iphone desktop handset hammacher schlemmer from hammacher schlemmer. It should be noted that the dynaco st70 has output transformer impedance taps at 4, 8, and 16 ohms. All parts needed for a complete upgraded dynaco st70 type kit except for the tubes. If the power supply doesnt work, then the amplifier. Featuring 60 watts or more per channel of tube power, the amps ability to run in either triode or ultralinear mode offers more versatility than most any other amp i know of. A very nice looking, straight dynaco st150, this one dials in from sometime, mid production mid 1978. The unit contains two 60 watt amplifiers on one chassis with a common power supply. The dynaco stereo 120 was the first powerful 60 wattschannel transistorized stereo power amplifier in wide production.
This video describes the installation of the complete rebuild kit into a dynaco stereo 120 power amplifier. Pa060s power transformer nearly twice the lamination stack size of the original, a470s output transformers, c354 choke. The vta st120 uses three custom wound usa made transformers and is available as a kit amp or completely wired and tested. Dynaco stereo 120 power amp instructions for assembly operation. Specwise this was true, but i always found the st 150 less satisfacory overall. I own a dynaco st 120 that i had upgraded by van alstine here in minnesota. For more information about jims build and his impressions of the st35 kit, see the dynaco st35 tube amp kit thread on the message forum. Its the baby brother of the dynaco st70 and tends to be overlooked by many vintage amplifier aficionados. I thought my spicas would need more power, but they are sounding suprisingly good for the 35 watts going to them. Unfollow dynaco st120 to stop getting updates on your ebay feed. I have a st400 that i cannot find the trouble but it was a much more powerful amplifier. The dynaco st35 power amplifier has been the center of my music system since i discovered it in 1982. The dynaco stereo 120 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 fm5 or af6, which have their own volume controls.
I had this one built 10 months ago with all the upgrades best capacitors attenuation pot so you dont necessarily need a pre amp sounds. We also had to repair the power switch circuit as one side of the switch had gone open. My uncle had the stereo 120, pat4 preamp, fm3 tuner, and a25 loudspeakers. The later dynaco stereo 150 had a more conventional circuit and was touted as a big upgrade. The dynaco st 35 power amplifier has been the center of my music system since i discovered it in 1982. New dynakit st70 advice steve hoffman music forums. Unfollow dynaco st 120 to stop getting updates on your ebay feed. Installation of the efbtm bias circuit in a dynaco. For those that need a little more power is the dynaco vta st120. Theres no go figure with the st120s performance re the st70i had one to compare to, the box stock 120 was better in highs and low extension. It should be noted that the dynaco st 70 has output transformer impedance taps at 4, 8, and 16 ohms. When i powered it up,not surprisingly, given his engineering background all the dynaco bits worked, but did not sound very good through those speakers. I recently came across dan joffes info online about the updated version for the dynaco 120, and thought it might improve the overall performance of my system, besides the fact i just love building electronic kits. Make your dynaco stereo 120 power amplifier better than new with these kits.
I eventually sold both along with a pat4 but a couple of years ago i decided to get a used st120 to. It uses octal tubes, which are right in line with the lovely classic sound of the dynaco. Including our custom made transformers, which are made to original specs right here in the usa. We hope this web page and the hints it offers could make it easier. Dynaco dynakit stereo 35 st35 tube amplifier schematic and. The st 120 was dave obrians favorite amp to test at the mcintosh clinics, because it truly demonstrated the huge difference between an amp with conservative specs and one with optimistic specs it measured horribly, and as often as not, didnt come close to meeting its published specs. These amps smoked the dynaco from the beginning of the bandwith to the last and final note. Photos of a dynaco st35 tube amplifier kit from dynakitparts which was put together by jim wisconsin, usa. Dynaco vintage amplifiers and tube amps for sale ebay. 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.
Schneider record player green mod turn table love the timeless style, how can. I would like to pool the tremendous knowledge base here as i am interested in. The vta st 120 is a 60 watt per channel amplifier built on the same st 70 stainless steel chassis as the amp pictured above. It can sing in romantic voice or with full twentyfirst century accuracy.
Lately the reputation of the st 120 has been rehabilitated. The vta st120 is a 60 watt per channel amplifier built on the same st70 stainless steel chassis as the amp pictured above. Bob latino vta st120 sold garage sale the klipsch audio. I used it for about 6 months in 1990 until i bought adcom 555. Dynaco vintage tube ampllifier technical articles, upgrade, restoration and repair resources for st 70, pas, sca35, st 35. David hafler released the dynaco st35 twochannel power tube amplifier nearly 50 years ago as a lower cost alternative to the popular st70. The st35 has output transformer impedances of 8 and 16 ohms. This may be a factory wired unit, or if not, the assembly is the same excellent quality. Dyna and hafler solid state amplifier rebuilds audio by. In 1985 i was given a dynaco 120 amp, which i have used up til now. Dynaco tube amplifier technical articles and upgrades st70.
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