Dynaco st 120 upgrades for windows

In addition to the upgraded chassis, the st120 also sports larger transformers than the original dynaco amps, allowing for higher power. Improved replacement power transformer for dynaco st70. If you want to join us and get repairing help please sign in or sign up by completing a simple electrical test. 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. Finally pulled the trigger on a bob latino dynaco st120. You can buy a kit from djoffe with new pc boards that converts the st120 to a lm3886 ic amp, akita company but i think his 38 solid no. Vta dynaco st120 tube amplifier tekton design lore impulse speakers. Therefore applying the same circuit that we developed for the stereo 70 to the mark 3 resulted in a dramatic improvement over the stock amplifier topology. The phones were discarded and all the dynaco stuff went on ebay. This dynaco st70 driver board pc3 has been developed and designed to be a dropin replacement for dynaco 7199 board. Hello again, am glad that the feedback i am getting from many of you indicates that you are happy with the information and ideas i have been describing. 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.

Dynaco stereo 120 solid state power amplifier update kits, power amplifier design and troubleshooting. This dynaco dates from 1968 and was built as a kit. This was due to its power supply transformer, and the. It had several problems and was a fairly challenging repair job. Classic dynaco sca80q integrated amp just recapped with original box sweet. Our famous original dyna st70 rebuild plans by frank van. Dynaco stereo 120 solid state amplifier repair journal. Dynaco st 120 upgrade info techtalk speaker building, audio. Finally pulled the trigger on a bob latino dynaco st120 new emotiva forums v. Vintage dynaco dynakit st70 stereo power amplifier. Dorey design group ddg dorey design group is a fullservice web design, open source programming, and marketing firm located in portland, or. For those that need a little more power is the dynaco vta st120. I have a dynaco system consisting of pas3 preamp, fm tuner and st35 amp my father built in 64 or 65.

Hard to find parts including dynakit original dropin replacement components typically ship within 24 hours of ordering. Honestly, far better sound exists today than the pat4st120 at a modest price. Dynaco tube amplifier technical articles and upgrades st. One by one, the major amplifier manufacturers have acceded to the pressures of the marketplace and introduced solidstate models, whether or not these happened to sound as good as their previous tubetype units. Dynacos st70 series 3 stereo tube amplifier produces 35 watts per channel stereo and switchable between both 4 and 8 ohm outputs.

Many old stereo 120 s have dead or dying amplifier modules. Dynaco was one of the last of the hold outs, preferring, according to their advertisements, to wait until they could produce a solidstate unit that was at least as good as their. This entry was written by admin, posted on may 29, 20 at 3. Dynaco st70 series 3 stereo integrated tube amplifier. Unfollow dynaco st120 to stop getting updates on your ebay feed. Dynaco st70 6gh8 6gh8a ecf82 driver board pcb pc3 kit.

If it were me, i would retire at least one of the pat4st120 pairs and buy what i think is the modern incarnation of the dynaco value concept. Heres a new mod that really does improve performance, and has the documentation to prove it. The heathkits have solid state rectification where the dynaco is tube rectified. No ones heard it yet, so hard to have any opinions. Some of you have complained that you want more meat technical information on audio equipment. Dynaco st120 amplifier replacementupgrade feet us ebay logo. If the dynaco st70 is great, then the heathkits are world class. Fastforward to today, and the repair of my jbl 4408 studio monitors. Did the cap upgrades and am having him wire and test it along with supplying his standard tube compliment. Continuing my quest for quality music, i ordered a dynaco vta st120 tube amplifier kit from bob latino at. I thought my spicas would need more power, but they are sounding suprisingly good for the 35 watts going to them. Download the dynaco st150 manuals for free hifi manuals.

If he had to pick one over another i am not sure which one would win. Pa060 s dynaco st70 upgrade power transformer replacement. Rather than fix it i purchased an nad c355bee thanks to the excellent recommendations here around 2008 and since it had. The unit contains two 60 watt amplifiers on one chassis with a common power supply. Lately the reputation of the st 120 has been rehabilitated. 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. There is a difference between the two amps besides the transformers. Triode, usa customer service mf 9am4pm ct 18007743201 email us anytime. This may be a factory wired unit, or if not, the assembly is the same excellent quality. I got to know him when i was selling my st120 on ebay a few months ago and had a problem with me using a phrase like tube amp in. I was wondering about buying a st120 and doing a upgrade on it to make it better. Class d replacement for dynaco st120 years ago i purchased four dyanco a50 speakers, two pat4 preamps, and two dyancost120 amps. No modifications required, wires have identical color coding as the original unit.

I used them with two speakers stacked on a side for years until one of the st120s died. We also offer an array of new select dynakit classic. The dynaco stereo 120 is an all silicon transistor basic. Hey sal, i dont know if this would help, but a guy who goes by tuninfork on ebay rebuildsmods st120s. Find great deals on ebay for dynaco 120 and dynaco 80. When i got it from him a few years ago it came with the original klh speakers that he used with it. I eventually sold both along with a pat4 but a couple of years ago i decided to get a used st120 to. 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 have the st 80 power transformer, but he suggested it might be marginal for the 120 upgrade. Dynaco st70 tube amp, upgraded, improved, restored, ex sound, usa. Reviving a dynaco stereo 120 for the studio jim kerkhoff. 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 stereo 120 solid state amplifier repair journal by chad hauris, retro electronics and audio lab, midland, tx. Now available for those that need a little more power is the dynaco vta st120.

Dynaco st120 pc15 power supply semiconductor kit us ebay logo. The schematic shows one lm3886 chip amp per channel. You recycle the power supply and chassis, and replace the old amplifier modules with the new. The owners manual is used as an reference guide, instruction manual and instruction book. It is labelled dynaco a division of panor corp from 1994. The heathkit aa1800 is similar, but designed by prof mwleach of georgia tech. Think the popular mods to your dynaco sca35st35 achieve its best performance.

Dynaco dynakit stereo 35 st35 tube amplifier schematic. Restoration module this is an exact replacement for the original dynaco pc3 board fabricated from milspec materials. Dynaco stereo 120 repair information update my dynaco. Thoughts on updating dynaco st120 audiokarma home audio. True on the power consumptions, my speakers do use 1 watt, as at 2 watts the neighbors windows rattle, quickly followed by their banging on my door. Seems to work but there is a noticeable hum present when its powered up.

Below you will found our manuals on the dynaco st150. Are you looking for a dynaco amp to have upgraded or would you. Update my dynaco akitika gt101 22nd november 2012, 02. First of all, we could see that the speaker output capacitors were bulging at the top and appeared bad. The stereo 120 contains two 60 watt amplifiers on one chassis with a common power supply. Comments are closed, but you can leave a trackback. Theres probably been more written about the dynaco st70 than about any other single piece of hifi gear, and the marketplace is probably have been more full of variations on that circuit than just about anything else on the market over the years from the early audio research amp to the van alstines to the sonic frontiers to the current bob. Dynaco vintage amplifiers and tube amps for sale ebay. 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 dynaco dynakit stereo 35 st35 tube amplifier kit. Later added a pat4 and st120, along with ar tt and ar4x.

All these fast transistors could oscillate, so do the part of the tip mod that involves putting 1020. Here at dynakit you will find the right parts to restore, repair or upgrade your original dynaco vacuum tube amplifier. Super excited to see how it does with my xsp1 gen2 and my tektons and. Follow any comments here with the rss feed for this post. Find the right dynaco parts to restore, repair or upgrade your original dynaco vacuum tube amplifier. The 400410416 was designed by james bongiorno, he also designed models for gas, marantz, sae. 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. 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. Kathys estate sales since the early 1970s providing clients with the highest level of service available throughout the portland metropolitan area eurotubes we are into tubes. Dynaco st 120 upgrade info techtalk speaker building. Ive built many complex electronic kits over my lifetime, and although its been many years since ive built anything, i still have the necessary soldering skills and tools to do so. I am really just talking about the feasibility of throwing another whole run of upgrades into the dynaco stereo st70, which he just upgraded. 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.

Dynaco st 120 upgrade info daniel at updatemydynaco supplied it, as i wrote, he was very helpful. The vta st120 uses three custom wound usa made transformers and is available as a kit amp or completely wired and tested. Btw, one of my clients is the owner to all the acrosounddynaco iron tooling, papers, patents magnequests mike lafevre who i have talk with. The dynaco st35 was a very special amplifier because of its very small size, and fantastic sound which it produced in spite of its small size. It will open a the small photo as a 480x640 window. The vta st120 is a 60 watt per channel amplifier built on the same st70 stainless steel chassis as the amp pictured above. Specwise this was true, but i always found the st 150 less satisfacory overall. Dynaco stereo 120 manual stereo power amplifier hifi. Convert your st35 from cathode bias to enhanced fixed bias for increased output power, lower distortion and extended tube life. You can get seriously highend sound out of your dynaco stereo 120 power amp, pat4 preamp, or sca80 integrated amp. This page contains everything i know about the dynaco stereo 120 power amplifier. The circuit is identical to our upgrade circuit for the st70 cascode gain stage direct.

Our update kit for the dynaco stereo 120 lets you rescue your dynaco from demise in the dumpster and make it better than new. As i removed the dynaco parts i couldnt help thinking of assembling the amp over 45 years ago and its subsequent history. In 1985 i was given a dynaco 120 amp, which i have used up til now. These amps smoked the dynaco from the beginning of the bandwith to the last and final note. They still have upgrades to dynaco gear, but all they use of the st120 is the chassis. But my diver cones did the weird in and out action at turn onoff the very first time the amp was powered up in ernest. Make your dynaco stereo 120 power amplifier better than new with these kits. A very nice looking, straight dynaco st150, this one dials in from sometime, mid production mid 1978.

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. The money would be better spent in another amp altogether. The update kit consists of new amplifier modules that you build. My first stereo was a kitbuilt dynaco st35 amp, a klh tuner and some phones. Dynaco owners please comment audiogon discussion forum. The original dynaco 6an8 design we believe was inferior to the 7199 driver used in the stereo 70. But what dynaco really put in there, and sent out if you bought replacements from them by the dynaco part number, were transistors in the same case but. David hafler and ed laurent founded the dyna company later dynaco with the intention of not only producing transformers, but highquality audio circuitry. The kit seems well thought out and seems to be a bargain to me. In addition, we offer an array of new select dynakit classic vacuum tube.

Additionally, the vta chassis uses nonmagnetic stainless steel chassis plates and screws. Compare the height of the core to the one in your dynaco. Although the st120 chassis has identical dimensions, it is made of heavier gauge metal 16ga vta vs. 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. The later dynaco stereo 150 had a more conventional circuit and was touted as a big upgrade. They also manufactured other tube and solid state amplifiers, preamplifiers, radio tuners and. It uses the 7199 circuit from the original it is not a redesign using the inferior 6gh8.

Photos of a dynaco st35 tube amplifier kit from dynakitparts which was put together by jim wisconsin, usa. The company was incorporated in october 1955, with business premises located at 617 n. This is exactly onehalf the weight of a dynaco st70. And in the 1990s, about 25 years after their heyday, there were still many thousands in use internationally. This board is a must for any serious restoration of the dynaco stereo70 to full stock condition. Replaces all the capacitors, resistors and rectifier diodes associated with the power supply.