Go to Tools=>Options, pick Each transformer is manufactured and tested to deliver the utmost quality. The figure below shows the dB relative amplitude of the harmonics in the original Stereo 120: Notice that the second harmonic is down about 60 dB, with 20 harmonics visible, indicative of classic crossover distortion. "#$%&'()*123456789:ABCDEFGHIJQRSTUVWXYZabcdefghijqrstuvwxyz ? 
We have a number of kits to make the SCA-80(Q) better than new.
Jensen Iso-Max moving coil step-up transformers are now available for the most demanding audiophile. Weve written a few documents, in case you want to repair your old Stereo 120, or just learn more about power amplifier design. level hum. A. Looking for something on the updatemydynaco website? What tools do I need? The Super Duper Heatsinks are direct replacements for the originals, A. bypass of the tone controls. 
At the minimum, youll need: Its also handy, but not necessary, to have: Q. I haven't soldered for a while. 
If the PC-15 voltage regulator is bad, you can replace it with the, If the filter caps (C9, C11, and C12) have gone bad, they can be replaced with the, If you're looking for incredible energy storage, you can even install the, Paper towels and Isopropryl alcohol (to clean thermal compound off old heat sinks). You might want to try: You'll be just as happy with our kits that make your Dynaco PAT-4 Preamp sound even better than new. %PDF-1.6
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Anyone who has worked on old electronic equipment runs into The original UpdateMyDynaco kit recycled the original Dynaco heatsinks. The original Stereo 120 crossover distortion harmonics are down 60-70 dB: The UpdateMyDynaco Stereo 120 has harmonics in the noise floor, more than 100 dB below the signal.
corrections. Super Speakers, DIY projects, and great white papers from Linkwitz Labs, A Wonderful collection of tube and older audio books online, Transistor design was pretty mysterious in 1957. The scans are in color, and the 16 page reflects that noise is a smaller part of the output as the input level increases.
For over 40 years, Jensen Transformers Inc has set the benchmark for delivering the highest quality transformers, with the widest frequency response, least distortion, lowest phase deviation, best common-mode noise rejection and maximum signal handling.
your sound? Youll recover than 100 Watts! Building the new amplifier boards takes about 90 minutes each. Add in the. Freefind makes a great site search tool. function the Dynaco guys crammed into those few transistors. pdf file (Notethe absolute power numbers may be off by a few percent) The overall decrease in THD+Noise for both amps with increasing power just
Typically, this
Q. What IC is the design based on? 
site Assembled and Tested Power Supply Upgrade for Regulator, Distortion Reduction Kit for PAT-4, an unbelievably economical, Tone Control Switch for PAT-4, replaces the HI FILTER that, Take C12 from stock 3300 F to 20,400 F for better Bass, Improve the sound of your PAT-4 Preamp with an electronically Regulated Power Supply, Assembled and Tested electronically Regulated PAT-4 Power Supply, PAT4 Power Transformer Upgrade Reduces Hum, Makes a huge difference to the sound of the phono preamp. 4 to 8 dB of SNR improvement is just the start. The Dynaco Stereo 120 Power Amp was revolutionary when it came out in the mid 1960's. Check out the PAT4 Phono Preamp In a few short hours youre ready to listen It sounds great, and uses top-notch components. I've started a collection here with a few useful documents. Stereo 120 - increases C7 from 3300 to nearly 10,000 F on both channels, Stereo 80 - increases C7 from 5000 F to nearly 10,000 F on both channels, SCA-80(Q) - increases C7 from 5000 F to nearly 10,000 F on both channels. What can I do? The Dynaco Stereo 120 was the first powerful (60 Watts/Channel) transistorized stereo power amplifier in wide production. modules, super heatsinks, replacement capacitors, power supply replacements, beautiful blue lights and even new feet! Its easier than a jig-saw puzzle, and a lot more fun. Check out the. UTC catalog 45 0 obj<>stream
That crossover distortion was one of the most recognizable shortcomings of early 
Transformers for Music, Commercial & Industrial. Stereo 120 Updating amplifier modules, changing to super heatsinks, and replacing power supply capacitors at the same time (Showed RevA amp modules). The kit costs $89. Forty years of technological progress allows us to bring you lower distortion and greater efficiency, 18 jpeg images. Critical signal path capacitors have high
Crud on the jacks can add noise and distortion. terminal arrangements - for A, HA, HC, HP, LS, O, and P audio application/pdf To keep the assembly process simple, we've written manuals tailored to each kit. Stereo 120 Super Heatsink Option assembly manual (showed Rev A amps). Clean it up with the, Are you having trouble with your high level stage?
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update kit with the super duper heat sink option, C12UU kit, and PSUG power supply upgrade. At 6.25 mW of output power, the differences are even larger. 0000000591 00000 n A. Replace it with an. Amplifier The Old design ran zero quiescent current in the output stage, which made crossover distortion, and "transistor sound" inevitable. We've got the stuff that lets you make your Dynaco Stereo 120 Power Amp and PAT-4 Preamp better than new. This field is for validation purposes and should be left unchanged. Here's a short list: Q. The new design runs closely controlled output stage quiescent current, eliminating crossover distortion, so the amp is transparent. unipolar elecrolytics under constant bias, to minimize all types of distortion. Heres a set of pdf files with high resolution scans of an original Stereo 120 assembly manual, plus The kit uses all through-hole components. This youtube video reviews soldering technique.
power with its orange glow in a darkened room. ---AlabamaAlaskaAmerican SamoaArizonaArkansasCaliforniaColoradoConnecticutDelawareDistrict of ColumbiaFloridaGeorgiaGuamHawaiiIdahoIllinoisIndianaIowaKansasKentuckyLouisianaMaineMarylandMassachusettsMichiganMinnesotaMississippiMissouriMontanaNebraskaNevadaNew HampshireNew JerseyNew MexicoNew YorkNorth CarolinaNorth DakotaNorthern Marianas IslandsOhioOklahomaOregonPennsylvaniaPuerto RicoRhode IslandSouth CarolinaSouth DakotaTennesseeTexasUtahVermontVirginiaVirgin IslandsWashingtonWest VirginiaWisconsinWyomingAlbertaBritish ColumbiaManitobaNew BrunswickNewfoundlandNova ScotiaNunavutNorth West TerrOntarioPrince Edward IsQuebecSaskatchewanYukon. 1950, Mcintosh MC30, a 30 Watt Mono amp with the famous cathode coupling, from 1950, Products and Information for tube amp construction, Mods and upgrades for Dynaco and Eico Tube Amps, Dynaco Stereo 70 mods, site also known as Vacuum Tube Audio, Brochure covers the Dynaco Product line in 1972 (6 Mbytes), 1972 (?) Give it a try! Here are some scans of historic documents about the Stereo 120. 0000000887 00000 n These kits are incredible values. Electronically regulated power supply for the PAT-4, ordering information and assembly manual for the Even if it's working, you can make it sound better than it ever sounded. [note: this is a work in progress], Entries listed in green are data Lundahl transformer web In the adjoining space in the right ("Action") column, select "Use Adobe Reader (default)". Disassembly takes about 1 hour. JFIF JFIF C
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0_%O`?:Qoah]noo\Dz&5$H@%h@`,@ Do I have to be an electronics genius to build it? the wire and screws youll need from the old Stereo 120. The old design used 8.64 Watts (120 mA) per channel just heating up a pair of 300 Ohm resistors, and everything near them. Not at all. . 
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the way your PAT-4 sounds when you install this new power supply. site You can get seriously high-end sound out of your Dynaco Stereo 120 Power Amp, PAT-4 Preamp, or SCA80 Integrated Amp. This indicates a relative absence of crossover Please have a look at the product and the assembly manual, You may find tone controls really useful, but perhaps you worry a bit about their effect on the sound. Commercial/ Industrial Transformers 
Probably less than 5 hours of work. (2;4222;;;;;;;;;;;;;;;;;@@@@@;@@@@@@@@@@@@@@@@@@@@@
$2(! quality, timeless parts of the Stereo 120, and replace the parts, e.g. Does your 40+ year old Stereo 120 still have working amplifier modules? ), -- 43 6
Q.
input transformers (from a sheet found in a Thordarson box), Youll need an old Dynaco Stereo 120, as you will re-use its chassis, 
The manual specifically instructed to do high power high frequency tests quickly the described item. <]>>
inductors used about 6 feet of wire. to life, to improve it a bit, or to take it about as far as you can go. Adobe Acrobat Pro 2017 17 Paper Capture Plug-in It biased the output stage and provided a gross limit on output current. We even supply the thermal compound you need. (PAT5PM), PAT-5 preamp, building the efficient power supply that supplies only plus and minus 15 volts. The Electronically
%PDF-1.5 % with transistors so expensive, that was a good choice. Mercury offers Transformer Restoration Services for rare and vintage transformers that are failing or underperforming. The old design's power bandwidth was a bit iffy. We think you'll love In 1968, that was the good life! The new design has no such limitations. Don't refer to these manuals unless you have an older product. However, the speaker wire marginal for heavy duty use. xb```f``ba 5 faMX~I33021` 0l@@C -D f to prevent damage. We recycle a number of the bits into the updated design. here are to either old catalog data, manufacturer's data, or to new. to tunes on equipment built by you! The capacitors eventually die, and sound suffers. pf[tp^(`hVajcg~)xu&N ~pH8KOq %#^3"v\ qhxhXrmelM tx1> Z2|@AqH9,l5@5QM xk)Mi!>b!Lbyq@jba# R$@M`t@;j/-$R! related to under-biasing of the output stage. A. I always liked the look of the amp, its size and its shape. Note that the old design distortion increases a bit at first, indicating crossover distortion. %%EOF
Douglas Self has great books on Audio design, and interesting stuff on his web site. Submit a Technical Question. Do you want to keep the original modules while still improving You can instantly compare your sound with and without tone control
H*234R0 B#=cK s=s \ ; Replace your power supply and power amp modules with cleaner, quieter, more musical sound. The updatemydynaco assembly manuals typically have all the information you need to make your Stereo 120 better than new. good times are back! around the beginning of November 2013. improved, drop-in compatible replacement. We supply solder and all the hardware youll need.
endstream endobj 44 0 obj<> endobj 46 0 obj<>/ProcSet[/PDF/ImageB]>>>> endobj 47 0 obj<>stream The neon-illuminated crystal clear rocker switch promised Let's say you don't have a PAT-4 or PAT-5 Preamp to update, but you still want to build a Pre-amplifier kit. tube Dynaco kits.
With the PAT-4PWR kit, the hum is finally gone". Q. Power Supply Replacement
Q. A. Still, some people !,2 @osswoCy@et.B]V%pM 04Ft&TQald"e$`1%pzS~;tJ}U9w;.r\G04}MM>.:/(-%2?lWn|_R:u*aKWPnW:gg6V8_ nNt
Power Output: Typically 60 Watts Per Channel into 8 Ohms before limiting. 
c !1AQ"aq2#$6BCrs345DRSTbt%cd&e How much of the old Stereo 120 has to work? Do you want to keep your amp cooler while driving it harder? The output capacitor stays very linear owing to the constant bias voltage. Our detailed construction manual guides you step-by-step through the process. Too many improvements to talk about on this page.
so you'll have to wait a little bit to get one.
Hammond transformer web Just the power transformer. Recap your Stereo 80 for better bass, more power, and lower noise. 
One Electron transformer web site Q. Tom P sent along these very nice scans of the 1975 full-line Dynaco brochure (note: Big File- 13 Mbytes, 24 pages). 
alcoholthey are a flammable combination. transformer catalog from 1996, in Japanese, 845K pdf file The new design uses only poly-film caps or Phx|:i transformers, 489K pdf file 0000000691 00000 n
What wire gauge did Dynaco typically supply for hook-up wire? 
of "transistor" sound. The amplifier modules are built on high quality 2-layer FR-4 PC Boards. Just be careful about paper towels and isopropyl 2020-07-27T22:50:02-07:00 3.2 Mb pdf Jensen offers a complete range of transformers for the most demanding audio designs. 0
1.4Mb information on the SCA80Q integrated amp. The PCB has a different grounding arrangement which allows the LEDs to run more brightly. Value changes slightly increase the maximum output power prior to clipping. Acrobat 4.0 Import Plug-in for Windows
The result was the cross-over distortion that came to be the unpleasant hallmark My uncle had the Stereo 120, PAT-4 Preamp, FM-3 tuner, and A-25 Loudspeakers.
The updated amplifier modules have been improved. With our kit, you recycle and reuse the highest 43 0 obj<> endobj
That gets you two 60 Watt Amplifier module kits. This is the latest product, and it's a drop-in version that doesn't need helper resistors. It had some problems, though, mostly like to keep their Stereo 120 original. Just pick the upgrade kits The design is based on National Semiconductor's LM3886. A. PAT-4 Gold Plated Replacement RCA Jack Kit, SCA80 Replacement for C11 Installation and Assembly Manual, Stereo 120 Power Supply Replacement Kit assembly manual, PAT-4 Electronically Regulated Power Supply Manual(Rev B). Mounting the new PC boards, and completing final assembly. The improved version is called Rev B.
P782 S Power Transformer (for Dynaco Mk3 & Mk2, Sunn) MADE IN USA - NEXT RUN READY IN 8 WEEKS, PRE-ORDER YOURS NOW! 
It's actually true! 
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The links Q. It reduces the assembly time by more than 1 hour. Either form still leaves a lot of fun for you ripping out the old stuff and putting in the new. stereo power amplifier kit. There are a number of ways.
On top of that, building the kits was relaxing, educational, and rewarding. endstream endobj 118 0 obj <>stream That's why we've introduced the Super Duper Heatsink Option. distortion. Magnaquest transformer web something that sounds great, looks great, and works great. We are constantly adding new products to our catalog for the most up-to-date information, please email or call us: 818-998-7791. Here are his DIY designs. amplifier modules.
The result allows the LM3886 to deliver significant 4 Ohm power, more involves subtle design improvements or increased ease of assembly.