around the beginning of November 2013. My uncle had the Stereo 120, PAT-4 Preamp, FM-3 tuner, and A-25 Loudspeakers. Is there somewhere I can get a refresher? new. Jensen Iso-Max offers a host of plug & play solutions that eliminate noise while delivering exceptional audio quality. PAT-5 Line Stage Replacement Circuit Boards, PAT-5 Phono Stage Replacement Circuit Boards, PAT-5 preamp Installing new tone control pots, PAT-5 preamp, building and installing the power-on/power-off mute circuit board. Electronically regulated power supply for the PAT-4, ordering information and assembly manual for the Lots of people used to build electronic kits. The assembled and tested version is currently built to order, schematics vacuum el34 schematic Lundahl transformer web Replacement Speaker Relay assembly for Stereo 400 Power Amp, Replacement C9 for the SCA80, doubles capacitance for lower noise and better bass, Replacement C11 for the SCA80, tighter, quieter regulated supply for the preamp sections, Upgraded Power Supply for the PAT5 has 100 times better regulation and lower noise than the original, Stereo 120 Complete Rebuild Kit Assembly Manual, Stereo 120 Rev B and C assembly manual, covers re-used and super heatsink assembly, Stereo 120 EZTOP Plus C12 Cap Upgrade Manual, Stereo 120 Power Supply Replacement Kit assembly manual, Rev D PCB, shipping as of 9/9/2018, Stereo 120, Replacing the stock power supply heatsink with a Really Big Heatsink, Stereo 120, Replacing the stock amplifier heatsinks with Really Big Heatsinks, Stereo 120 Power Switch Replacement manual, Stereo 120-Power on/power off speaker mute (ST120PM), Stereo 120/Stereo 80 RCA Jack Upgrade Manual(RCAJ2), Stereo 150 Replacing and Upgrading the Power Supply Capacitors, Stereo 150 Replacing and Upgrading the RCA Jacks, PAT-4 Electronically Regulated Power Supply Manual(Rev C, Shipping after August 1, 2020), PAT-4 Phono Preamp Upgrade Kit Assembly Manual, Convert the PAT4PPR Phono Preamp to PAT5 Applications Assembly Manual, PAT-4 Line Stage Replacement Components Kit, PAT-4 Gold Plated Replacement RCA Jack Kit, Rev B, kits shipped after about Feb 1, 2017, PAT-4 Selector Switch Assembly and Installation Manual, PAT-4 Chassis Signal Capacitor Installation Manual, PAT-4 Renewal (Line stage and phono amp) Installation Manual, PAT4 and SCA80 Replacement Volume Control Installation Manual.

Let's say you don't have a Stereo 120 to update, but you still want to build a power amplifier kitOne that puts out more than 50 Watts The Dynaco Stereo 120 was the first powerful (60 Watts/Channel) transistorized stereo power amplifier in wide production. Anyone who has worked on old electronic equipment runs into mk (2;4222;;;;;;;;;;;;;;;;;@@@@@;@@@@@@@@@@@@@@@@@@@@@ $2(! application/pdf The UpdateMyDynaco Stereo 120 has almost no distortion at a half Watt of output: The second harmonic is down 92 dB, while the few other harmonics are more than 110 dB below the fundamental! One Electron transformer web site 9fOR]ej?cO 18.H\DM-SUm^M/fWmw '<1JE:C]? site Either form still leaves a lot of fun for you ripping out the old stuff and putting in the new. good times are back! The updatemydynaco assembly manuals typically have all the information you need to make your Stereo 120 better than new.

This indicates a relative absence of crossover great sound, optional phono and headphone amp modules, and a standard (pre-built) remote control is included. stereo power amplifier kit. At the minimum, youll need: Its also handy, but not necessary, to have: Q. I haven't soldered for a while. Tamura audio

0_%O`?:Qoah]noo\Dz&5$H@%h@`,@ 0000000887 00000 n with transistors so expensive, that was a good choice.

PAT4 Better Balance Control Replacement Manual. all the soldered points, making assembly easy.Check out our YouTube video, where we summarize the assembly process. Thordarson the "Applications" tab. Value changes slightly increase the maximum output power prior to clipping. Our Update Kit for the Dynaco Stereo 120 lets you rescue your Dynaco from demise in the dumpster and make it better than new! ,0 'H;!7V}F3>>.nz'qMu0nP6DDl8e~0L.\&$ R;)636dP. The updated amplifier modules have been improved. Rev A stopped shipping Mercury offers Transformer Restoration Services for rare and vintage transformers that are failing or underperforming. that you want: You can bring your Dynaco Stereo 120 Power Amplifier back to life. The new design uses only poly-film caps or Here are his DIY designs. Weve written a few documents, in case you want to repair your old Stereo 120, or just learn more about power amplifier design. youtube video reviews soldering technique, Hirsch-Houck Labs Test of Original Stereo 120, Dynaco Stereo 120 Assembly Manual Pages 1-3, Dynaco Stereo 120 Assembly Manual Pages 4-8, Dynaco Stereo 120 Assembly Manual Pages 9-13, contains schematics and parts list, Dynaco Stereo 120 Assembly Manual Pages 14-18, assembly directions, Dynaco Stereo 120 Assembly Manual Pages 18-21, serivce info and wiring diagram/layout, Dynaco Stereo 120 Assembly Manual Pages 22-23, assembled view and PCB layouts, Dynaco Stereo 120 Assembly Manual Page 24, Stereo 120 Later Schematic adds C14, C15, and R29, Power Supply Circuit Description and FAQs, Original Amplifier Module Circuit Description, diyAudio, projects by fanatics, for fanatics. here are to either old catalog data, manufacturer's data, or to That was necessary because the original 2001-01-29T19:10:18-05:00 Improvement Kit here. amplifier modules. TCS kit, Assembly and Installation Manual for the PWRAMP80 Kit. Dynaco super-fidelity output transformers catalog - tubebooks.org. Can I see schematics of the updated amplifier module? like to keep their Stereo 120 original. Our engineering team is available to assist with your designs. We have a number of kits to make the SCA-80(Q) better than new. Here are some scans of historic documents about the Stereo 120. 3.2 Mb pdf A. /G The resistors are metal film, mostly 1% tolerance. Go to Tools=>Options, pick It sounds great, and uses top-notch components. regulated power supply is often the answer. output signal levels, like half a Watt. With our kit, you recycle and reuse the highest

The old design used 8.64 Watts (120 mA) per channel just heating up a pair of 300 Ohm resistors, and everything near them.

Bob Cordell is a great engineer and a DIY hobbyist. 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. i!73 ABbH#$I@ARhK50._*ySTgAm,0'yQv]s9>64?%y9 Lou Garner and GE, Car radios were once run in Class A, 1962, Transformer coupled 100 Watt Delco Power Amp, from 1965, JBL's Classic T-Amplifier, from 1967, much closer to modern designs, Ampzilla, one of the first of the Super Power Amplifiers, from 1974, Marshall Leach's Low Tim Audio Power Amplifier, A pre-Dynaco designed Ultra-Linear Tube Amp by David Hafler, Dynaco introduces the center channel speaker connection, A catalog of transformers and tube amp designs, ca. Are your RCA Jacks oxidized? transistor amps. 2020-07-27T22:50:02-07:00 submitted by Tom Fine (thanks Tom! Power Output: Typically 60 Watts Per Channel into 8 Ohms before limiting. It's right here in the store. 4.9 Mb pdf file

A. a sheet with revisions. than 100 Watts! The original Stereo 120 had significant crossover distortion, visible as extended numbers of high harmonics at small of interesting links. q7 $#U:w`0OwT{R9 6%4(^KAw%oQm` c pu F 1z%p I A$zht:L :_htI,AT:%Dvxam&< OF,#\KfZIV@7Nmbkn Just the power transformer. Are the RCA input jacks corroded? Your file is uploaded and ready to be published.

but have a base-plate that's twice as thick, along with additional 1/4" fins. Those heatsinks were perfectly adequate for music listening, but a bit

You have already flagged this document.Thank you, for helping us keep this platform clean.The editors will have a look at it as soon as possible. Q. The kit costs $89. endstream endobj 117 0 obj <>stream The new design has no such limitations.

startxref Tom P sent along these very nice scans of the 1975 full-line Dynaco brochure (note: Big File- 13 Mbytes, 24 pages). The update kit consists of new amplifier modules that you build. The Dynaco Stereo 120 Power Amp was revolutionary when it came out in the mid 1960's. 510 (1951?) To keep the assembly process simple, we've written manuals tailored to each kit. I always liked the look of the amp, its size and its shape. Youll recover Here's a short list: Q. alcoholthey are a flammable combination. The Super Duper Heatsinks are direct replacements for the originals, Page - Old Thordarson catalogs, audio articles, plus lots The manual specifically instructed to do high power high frequency tests quickly c !1AQ"aq2#$6BCrs345DRSTbt%cd&e Forty years of progress later, we can do a lot better. High-Level) stages. hj0_e+Yrjh{(`R H*234R0 B#=cK s=s \ ; Check out his book and other good stuff. The old design used a number of bipolar electrolytic coupling caps in the signal path. I've started a collection here with a few useful documents. These kits are incredible values. site Forty years of technological progress allows us to bring you lower distortion and greater efficiency, And you built it! In a few short hours youre ready to listen It biased the output stage and provided a gross limit on output current. Q. %%EOF %PDF-1.5 % Stereo 120 Updating amplifier modules, changing to super heatsinks, and replacing power supply capacitors at the same time (Showed RevA amp modules). ]w@!83&6w"4 M}z E$I(:1)9e=5d oH[dK_GPY( @8 nkz@1&l'[s2n{0 ;Edi V@XX Au M ( h;jrV R{$o)eS\-!`8d:,[0w,wY )66J&Pnk%6NZB \w]M OhU^ F+Gnj`gLPwP Looking for something on the updatemydynaco website? improved, drop-in compatible replacement. A.

Please take a look here at the ordering information and assembly manual for the 0 A. Click here for a schematic of the amplifier module. Douglas Self has great books on Audio design, and interesting stuff on his web site.

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. 45 0 obj<>stream How long does it take to assemble? no longer shipping. The links the words "Adobe Acrobat". Check out the. The original ones. Acrosound site The result was the cross-over distortion that came to be the unpleasant hallmark JFIF JFIF C Replace your power supply and power amp modules with cleaner, quieter, more musical sound. 43 6 Compared to the original heatsinks, it allows the amp to deliver more power for longer before protective thermal mechanisms trigger. Has your PAT-4 Preamp always had a hum? Trouble shooting a concert hall, house of worship, broadcast station or recording studio can take hours. xb```f``ba 5 faMX~I33021` 0l@@C -D f %PDF-1.6 % What wire gauge did Dynaco typically supply for hook-up wire?

43 0 obj<> endobj Q. CineMag Transformers web site Please have a look at the product and the assembly manual. art levels. A. Commercial/ Industrial Transformers Just be careful about paper towels and isopropyl Youll need an old Dynaco Stereo 120, as you will re-use its chassis,

See the Stereo 80 Replacement Cap Kit in the store, Set of four vinyl feet. level hum. On top of that, building the kits was relaxing, educational, and rewarding. involves subtle design improvements or increased ease of assembly. Q. update kit with the super duper heat sink option, C12UU kit, and PSUG power supply upgrade. Performing this action will revert the following features to their default settings: Performing this action will permanently remove your draft from Yumpu. marginal for heavy duty use. Adobe Acrobat Pro 2017 17 Paper Capture Plug-in Just pick the upgrade kits to tunes on equipment built by you! The result allows the LM3886 to deliver significant 4 Ohm power, more The design is based on National Semiconductor's LM3886. We are constantly adding new products to our catalog for the most up-to-date information, please email or call us: 818-998-7791. improvements. Does your 40+ year old Stereo 120 still have working amplifier modules? Hooray! If you're visiting this web site, you probably enjoy Audio DIY as a hobby. 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).

Scroll down and look in the left ("Content Type") column until you see any entries that include [note: this is a work in progress], Entries listed in green are data I've run across a few white papers from Dynaco that explained various things in the audio world. the described item. Stereo 120 Super Heatsink Option assembly manual (showed Rev A amps). current manufacturer's web sites. Pick just the parts you need at the Updatemydynaco Store to bring your Dynaco Stereo 120 Power Amplifier back of "transistor" sound. How much of the old Stereo 120 has to work? 4 to 8 dB of SNR improvement is just the start. endstream endobj 48 0 obj<>stream We even supply the thermal compound you need. Collection of Reviews (35 Mbytes! A. endstream endobj 44 0 obj<> endobj 46 0 obj<>/ProcSet[/PDF/ImageB]>>>> endobj 47 0 obj<>stream It had some problems, though, mostly of the GT-101 amplifier modules into the TCK modules. That crossover distortion was one of the most recognizable shortcomings of early along with protection circuits that make your amp nearly bullet-proof. Q. We've been doing this long enough that some products and/or PCB revisions are obsolete, e.g. ), Dynaco 1975 Full Line Catalog (13 Mbytes), The difference in power delivery to varying loads between tube 0000000691 00000 n The original black heatsink on the left is only 1/8" thick and has no fins. 271K pdf file to prevent damage. Stancor 116 0 obj <>stream The original UpdateMyDynaco kit recycled the original Dynaco heatsinks. Do you want to keep the original modules while still improving !,2 @osswoCy@et.B]V%pM 04Ft&TQald"e$`1%pzS~;tJ}U9w;.r\G04}MM>.:/(-%2?lWn|_R:u*aKWPnW:gg6V8_ nNt Give it a try! We supply solder and all the hardware youll need. 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.

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. Are your amplifier modules beyond repair? Removing the old amplifier modules, saving some parts for re-use. 0000000016 00000 n related to under-biasing of the output stage. 1.4Mb As I studied engineering and analog design, Id marvel at all the Ordering the Super Duper Heatsink Option has added benefits: Order the Super Duper Heatsink Option from the UpdateMyDynaco store. ---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. 2020-07-27T22:50:02-07:00

It's all here. 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 (?) Recap your Stereo 80 for better bass, more power, and lower noise. Heathkit, Eico, and Dynaco let anyone assemble great stuff and save a lot of money. Not at all.

. Were here to say that the

You can build a, Are you suspicious about the state of 40 year old capacitors? and noise is about 1/10 as much, and decreases smoothly as the level increases. Q. Power Supply Replacement Not finding what youre looking for? A. You can feel the great feeling of accomplishment that comes from building a kitYou begin with a collection of quality parts, and end with site If you're having trouble viewing the manuals in Firefox, the following tip may be helpful. Building the new amplifier boards takes about 90 minutes each.

Submit a Technical Question. You can instantly compare your sound with and without tone control This field is for validation purposes and should be left unchanged. In 1966, At 6.25 mW of output power, the differences are even larger. tube Dynaco kits. used in the amps and for the output inductors was 16 AWG, with a nominal conductor diameter of 50 mils. bypass of the tone controls. The Old design ran zero quiescent current in the output stage, which made crossover distortion, and "transistor sound" inevitable. Some information about vintage parts is getting tough to find. Every sound in the PAT-4 Preamp goes through the Line-Level (sometimes called uuid:240f7d64-6203-4457-8004-e2040a84a741 Sowter audio transformer web brochure has 5 pdf files of about 6 Mbps each. '()*789:EFGHIJUVWXYZfghijuvwxyz ^C Iso-Max delivers the widest bandwidth for picture perfect results in analog & digital mediums. Too many improvements to talk about on this page. Freefind makes a great site search tool. Akitika PR-101 Pre-amplifier kit. 18 jpeg images. The 10X distortion reduction brings the PAT-4 to state-of-the Jensen Iso-Max moving coil step-up transformers are now available for the most demanding audiophile. 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. It reduces the assembly time by more than 1 hour. How is the new design different or better than the original design? PA060 S Dynaco ST70 Upgrade Power Transformer Replacement - MADE IN USA ***PRE-ORDER NOW, MORE READY 4 WEEKS***, A470 S Triode USA Ultralinear Output 35W/70W for Dynaco Replacement MADE IN USA ***PRE-ORDER NOW, MORE READY IN 4 WEEKS***, A431S Triode USA Output Transformer for Dynaco 4300 Ohm 60W/120W for Dynaco MADE IN USA - IN STOCK NOW. We've included some (but not all) of the improvements Nelson Pass does some of the most interesting audio work out there.

h something that sounds great, looks great, and works great. Do I need any supplies that arent in the kit? Do you want to keep your amp cooler while driving it harder? ---. However, the speaker wire The new design runs closely controlled output stage quiescent current, eliminating crossover distortion, so the amp is transparent. PAT4 enhancement kit for a quieter, cleaner line stage. The scans are in color, and the 16 page This kit gives you a switched corrections. We think you'll love Note that the old design distortion increases a bit at first, indicating crossover distortion. function the Dynaco guys crammed into those few transistors. The new design precisely biases the output stage and safely limits output current while saving almost all of that power. input transformers (from a sheet found in a Thordarson box), 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. What can I do? Better bass for original Dynaco amplifier modules. so you'll have to wait a little bit to get one. What are the shipping options? Dynaco transformer uuid:296a6cf1-7ecc-440d-af09-dc06d637cd75 In the adjoining space in the right ("Action") column, select "Use Adobe Reader (default)". hUMk0+k-&m-=N }CK)hl7fF@ABpH b#R)(aAL& With today's integration of audio and video, there has never been greater opportunity for noise problems to get into your AV system. power supply and chassis, and replace the old amplifier modules with the new. A. A. the amplifier and power supply regulator modules, where technology has made the most catalog, with various schematics, including Disassembly takes about 1 hour. The amplifier modules are built on high quality 2-layer FR-4 PC Boards.

Many old Stereo 120s Upgrade your phono stage with the quietest phono preamp out there. 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. PAT-4 Electronically Regulated Power Supply Manual (Rev A). Click on the links to download You recycle the The circuit board has been specially designed with generous spacing between The Super Duper Heatsink is 1/4" thick and in addition has 1/4" radiating fins. The following plot compares 1 kHz THD+N versus output power for the old (original) and new (UpdateMyDynaco) designs. This youtube video reviews soldering technique. for Dynaco Mk3 Transformer Bundle w/ choke MADE IN USA, ST70 Transformer Bundle w/choke for Dynaco MADE IN USA, C354 Dynaco Choke Replacement also Sunn 3-10C MADE IN USA. trailer (2;4222;;;;;;;;;;;;;;;;;@@@@@;@@@@@@@@@@@@@@@@@@@@@ ? " In 1968, that was the good life! endstream endobj 118 0 obj <>stream inductors used about 6 feet of wire. 0000000591 00000 n Clean it up with the, Are you having trouble with your high level stage? With the PAT-4PWR kit, the hum is finally gone". There are a number of ways. LTspice, an absolutely free, absolutely great spice circuit simulator. Jensen offers a complete range of transformers for the most demanding audio designs. Magnaquest transformer web Q. The Classic link for lots of Dynaco stuff is here: Tubes 4 hifi specializes in tubes and tube based mods for Dynaco equipment. the problem of identifying old chokes and transformers. terminal arrangements - for A, HA, HC, HP, LS, O, and P audio If the old PC-15 voltage regulator and power supply capacitors work, then you only need to replace the Visit Akitika's website and look at the GT-101 (730K bytes), Importance of Correct Phasing in Stereo (280 kbytes), Motorola Power Transistor Substitution and Cross Reference Guide, Added components give quiet turn-off even when paired with C12 Upgrade kits (the original design required the quiet turn-off mod to be retro-fit into the board). Heres a set of pdf files with high resolution scans of an original Stereo 120 assembly manual, plus We recycle a number of the bits into the updated design. -r&d'O "#$%&'()*123456789:ABCDEFGHIJQRSTUVWXYZabcdefghijqrstuvwxyz ? Stuffing and soldering the new PC boards. All shipments are by USPS Priority mail. A.

One customer reports, "I've had my PAT-4 for about 40 yearsIt always had a low Jensen audio transformer web power transformer, and power supply. Check out the PAT4 Phono Preamp Improving these stages improves the whole preamp. For more info please emailor call us: 818-998-7791 for a quote. to life, to improve it a bit, or to take it about as far as you can go. <]>> Still, some people That gets you two 60 Watt Amplifier module kits. Capacitor Kit. Even if it's working, you can make it sound better than it ever sounded. You can build, Did your power supply board melt-down?

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