0000000996 00000 n and transistor amps. We've included some (but not all) of the improvements A. Sowter audio transformer web Every sound in the PAT-4 Preamp goes through the Line-Level (sometimes called A. endstream endobj 118 0 obj <>stream Anyone who has worked on old electronic equipment runs into Stancor The 10X distortion reduction brings the PAT-4 to state-of-the Thordarson of interesting links. Collection of Reviews (35 Mbytes! &-(0/,(,+28H=25D6+,>U?DJLPQP0. "#$%&'()*123456789:ABCDEFGHIJQRSTUVWXYZabcdefghijqrstuvwxyz ? Upgrade your phono stage with the quietest phono preamp out there.

Value changes slightly increase the maximum output power prior to clipping. (PAT5PM), PAT-5 preamp, building the efficient power supply that supplies only plus and minus 15 volts. power with its orange glow in a darkened room. great sound, optional phono and headphone amp modules, and a standard (pre-built) remote control is included. The new design has no such limitations. site Check out his book and other good stuff. i!73 ABbH#$I@ARhK50._*ySTgAm,0'yQv]s9>64?%y9 Each transformer is manufactured and tested to deliver the utmost quality. 0000000887 00000 n The Electronically dynaco dynakit The Classic link for lots of Dynaco stuff is here: Tubes 4 hifi specializes in tubes and tube based mods for Dynaco equipment. The result allows the LM3886 to deliver significant 4 Ohm power, more transformer catalog from 1996, in Japanese, 845K pdf file . 3.2 Mb pdf Is there somewhere I can get a refresher?

Magnaquest transformer web Lots of people used to build electronic kits. It sounds great, and uses top-notch components. Q. ! Trouble shooting a concert hall, house of worship, broadcast station or recording studio can take hours. xref

The Dynaco Stereo 120 Power Amp was revolutionary when it came out in the mid 1960's. Pick just the parts you need at the Updatemydynaco Store to bring your Dynaco Stereo 120 Power Amplifier back Replace it with an. Improvement Kit here. Audio Amp Transformers JFIF JFIF C Adobe d ' "'''''",////,7;;;7;;;;;;;;;; $2(! and noise is about 1/10 as much, and decreases smoothly as the level increases.

Tamura audio endstream endobj 117 0 obj <>stream amplifier modules. of the GT-101 amplifier modules into the TCK modules. that you want: You can bring your Dynaco Stereo 120 Power Amplifier back to life. reflects that noise is a smaller part of the output as the input level increases. Q. 0000000016 00000 n Too many improvements to talk about on this page. I've started a collection here with a few useful documents. Transformers for Music, Commercial & Industrial. We think you'll love A. Dynaco transformer improvements. Visit Akitika's website and look at the GT-101 Do I need any supplies that arent in the kit? PAT4 enhancement kit for a quieter, cleaner line stage. 43 6 ), -- You can even replace the, Just looking for good information? A pair of assembled and tested circuit boards costs $139.

Weve written a few documents, in case you want to repair your old Stereo 120, or just learn more about power amplifier design.

trailer art levels. 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 9fOR]ej?cO 18.H\DM-SUm^M/fWmw '<1JE:C]? 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. Here are a series of testimonials from our customers. Acrosound Bandwidth: -3 dB small signal bandwidth at 6 Hz and 60 kHz into an 8 Ohm load, Distortion: 0.02% typical, or less, for any level below clipping into 8 Ohms, Noise: 0.05 mV typical in a 100 kHz Bandwidth, shorted or open input, Output Impedance: 90 milli-Ohms typical, measured at the speaker binding posts, at 1 kHz. site TCS kit, Assembly and Installation Manual for the PWRAMP80 Kit. '()*789:EFGHIJUVWXYZfghijuvwxyz ^C Improving these stages improves the whole preamp. Does your 40+ year old Stereo 120 still have working amplifier modules? UTC You can instantly compare your sound with and without tone control along with protection circuits that make your amp nearly bullet-proof. In 1968, that was the good life! Catalog from 1955 - has classic hi-fi amp circuits, too! submitted by Tom Fine (thanks Tom! One customer reports, "I've had my PAT-4 for about 40 yearsIt always had a low You can build, Did your power supply board melt-down? The new design uses only poly-film caps or If the old PC-15 voltage regulator and power supply capacitors work, then you only need to replace the Submit a Technical Question. like to keep their Stereo 120 original. so you'll have to wait a little bit to get one. Our detailed construction manual guides you step-by-step through the process. A. That crossover distortion was one of the most recognizable shortcomings of early Go to Tools=>Options, pick Akitika PR-101 Pre-amplifier kit.

The kit uses all through-hole components. [note: this is a work in progress], Entries listed in green are data The Super Duper Heatsink is 1/4" thick and in addition has 1/4" radiating fins.

At 6.25 mW of output power, the differences are even larger. Ordering the Super Duper Heatsink Option has added benefits: Order the Super Duper Heatsink Option from the UpdateMyDynaco store. We even supply the thermal compound you need. a sheet with revisions. Electronically regulated power supply for the PAT-4, ordering information and assembly manual for the ]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 Reassembly takes another 90 minutes. Probably less than 5 hours of work.

We recycle a number of the bits into the updated design. Jensen offers a complete range of transformers for the most demanding audio designs. The circuit board has been specially designed with generous spacing between of "transistor" sound.

With our attention to detail you can be assured that your restored vintage transformer will look AND sound exactly as it did. Just isopropyl alcohol and some paper towels for clean-up. Those heatsinks were perfectly adequate for music listening, but a bit %PDF-1.5 % The design is based on National Semiconductor's LM3886. It's actually true! !,2 @osswoCy@et.B]V%pM 04Ft&TQald"e$`1%pzS~;tJ}U9w;.r\G04}MM>.:/(-%2?lWn|_R:u*aKWPnW:gg6V8_ nNt Forty years of technological progress allows us to bring you lower distortion and greater efficiency, (2;4222;;;;;;;;;;;;;;;;;@@@@@;@@@@@@@@@@@@@@@@@@@@@ $2(! hj0_e+Yrjh{(`R c !1AQ"aq2#$6BCrs345DRSTbt%cd&e Power Supply Replacement The improved version is called Rev B. unipolar elecrolytics under constant bias, to minimize all types of distortion. quality, timeless parts of the Stereo 120, and replace the parts, e.g. uuid:296a6cf1-7ecc-440d-af09-dc06d637cd75 YUMPU automatically turns print PDFs into web optimized ePapers that Google loves. Add in the. UpdateMyDynaco has designed a high performance amplifier replacement module kit that lets you make your Stereo 120 better than A. Click here for a schematic of the amplifier module. 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 (?) 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. endstream endobj 44 0 obj<> endobj 46 0 obj<>/ProcSet[/PDF/ImageB]>>>> endobj 47 0 obj<>stream PAT4 Better Balance Control Replacement Manual. The output capacitor stays very linear owing to the constant bias voltage. endstream endobj 48 0 obj<>stream endstream endobj 37 0 obj <>stream That's why we've introduced the Super Duper Heatsink Option. 4 to 8 dB of SNR improvement is just the start. /G A. Acrobat 4.0 Import Plug-in for Windows A. SCA80 Installing the PWRAMP80 Assembly Manual, SCA80(Q) Installing New Components on the old SCA80(Q) Preamp Circuit Boards, SCA80(Q) New preamp PCB's and new components for the preamp section of an SCA80(Q), SCA80(Q) New R's and C's for the front panel assembly of an SCA80(Q), Stereo 80 Installing the PWRAMP80 Assembly Manual, ST80CAPS: Replacing all the chassis mounted caps in a Stereo 80, FM-5 and AF-6 Cartridge Lamp Replacement Manual, FM-5 Replacing the Volume Control-Power Switch, Stereo 70 Bias Power Supply Upgrade Assembly and Installation Manual, Upgrading DH-101 Preamp RCA Jacks Assembly Manual, Upgrading SCA-35 and general 4-jack RCA Jacks Assembly Manual, Upgrading ST-70, AF-6, and general 2-jack RCA Jack Assembly Manual. This field is for validation purposes and should be left unchanged. have dead or dying amplifier modules. the way your PAT-4 sounds when you install this new power supply. function the Dynaco guys crammed into those few transistors. terminal arrangements - for A, HA, HC, HP, LS, O, and P audio Jensen audio transformer web Iso-Max eliminates ground loops in high-fidelity 2-channel and home theater systems with purpose-built solutions that work. bypass of the tone controls. The Dynaco Stereo 120 was the first powerful (60 Watts/Channel) transistorized stereo power amplifier in wide production. It keeps the amp cool for all normal operating scenarios.

The old design's power bandwidth was a bit iffy. 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! The Old design ran zero quiescent current in the output stage, which made crossover distortion, and "transistor sound" inevitable. 0000000416 00000 n 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. 271K pdf file How is the new design different or better than the original design? here are to either old catalog data, manufacturer's data, or to Better bass for original Dynaco amplifier modules.

site Were here to say that the Looking for something on the updatemydynaco website? 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. Q. Please have a look at the product and the assembly manual. It had some problems, though, mostly Just be careful about paper towels and isopropyl Amplifier (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). Critical signal path capacitors have high Q. Youll need an old Dynaco Stereo 120, as you will re-use its chassis, To keep the assembly process simple, we've written manuals tailored to each kit. 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 links A. Scroll down and look in the left ("Content Type") column until you see any entries that include These kits are incredible values. than 100 Watts! stereo power amplifier kit. We are constantly adding new products to our catalog for the most up-to-date information, please email or call us: 818-998-7791. Rev A stopped shipping 2020-07-27T22:50:02-07:00 SCA80 Replacement for C11 Installation and Assembly Manual, Rev B, all product shipped after about Feb 1, 2017. inductors used about 6 feet of wire. What are the shipping options? If you're having trouble viewing the manuals in Firefox, the following tip may be helpful. the described item. Check out the PAT4 Phono Preamp 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. Phx|:i

(Notethe absolute power numbers may be off by a few percent) The overall decrease in THD+Noise for both amps with increasing power just tube Dynaco kits. It reduces the assembly time by more than 1 hour.

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. Dynaco super-fidelity output transformers catalog - tubebooks.org.

A. 0000000691 00000 n

Q. At the minimum, youll need: Its also handy, but not necessary, to have: Q. I haven't soldered for a while. The original Stereo 120 had significant crossover distortion, visible as extended numbers of high harmonics at small Crud on the jacks can add noise and distortion. Capacitor Kit. Here are some links you may find interesting: The Stereo 120 wasn't the only history making amplifier, here are a few others: These tube amps were designed by Hafler and Keroes before there was a Dynaco: An older Audio Research and Mcintosh Design: These web sites have some interesting material on tube amps: I found some lovely old brochures in my filesa short (4 page) brochure, and a long (16 page) brochure. 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. Page - Old Thordarson catalogs, audio articles, plus lots Youll recover 43 0 obj<> endobj High-Level) stages. 2001-01-29T19:10:18-05:00 with transistors so expensive, that was a good choice. Qt M@\8Enld,jAJ,)2:u6'g39,KnJN!F~wMhZEhg'd^t@Dc) } That was necessary because the original The new design's distortion alcoholthey are a flammable combination. transistor amps. Disassembly takes about 1 hour. startxref Stuffing and soldering the new PC boards.

The amplifier modules are built on high quality 2-layer FR-4 PC Boards.

The old design used 8.64 Watts (120 mA) per channel just heating up a pair of 300 Ohm resistors, and everything near them. 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). What can I do? Jensen Iso-Max moving coil step-up transformers are now available for the most demanding audiophile. Lundahl transformer web 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. The new design precisely biases the output stage and safely limits output current while saving almost all of that power. H*234R0 B#=cK s=s \ ; Bob Cordell is a great engineer and a DIY hobbyist. Some information about vintage parts is getting tough to find. 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). 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. Give it a try! good times are back! CineMag Transformers web site With the PAT-4PWR kit, the hum is finally gone". Your file is uploaded and ready to be published.

Triad transformer catalogs from 1951 to 2002 Heathkit, Eico, and Dynaco let anyone assemble great stuff and save a lot of money. The result was the cross-over distortion that came to be the unpleasant hallmark If you can stay calm and follow directions, you shouldnt have any trouble. Iso-Max delivers the widest bandwidth for picture perfect results in analog & digital mediums. In the adjoining space in the right ("Action") column, select "Use Adobe Reader (default)". site endstream endobj 38 0 obj <> endobj 40 0 obj <> endobj 49 0 obj <>stream The original black heatsink on the left is only 1/8" thick and has no fins. Power Output: Typically 60 Watts Per Channel into 8 Ohms before limiting. With today's integration of audio and video, there has never been greater opportunity for noise problems to get into your AV system. but have a base-plate that's twice as thick, along with additional 1/4" fins. Heres a set of pdf files with high resolution scans of an original Stereo 120 assembly manual, plus Replace them with the, Have your old feet fallen apart? corrections. Note that the old design distortion increases a bit at first, indicating crossover distortion.

You recycle the

Stereo 120 Super Heatsink Option assembly manual (showed Rev A amps). Mercury offers Transformer Restoration Services for rare and vintage transformers that are failing or underperforming. 510 (1951?) The TechnoPhool current manufacturer's web sites. the "Applications" tab. update kit with the super duper heat sink option, C12UU kit, and PSUG power supply upgrade. NewVolt Automotive Amps. As I studied engineering and analog design, Id marvel at all the PAT-4 Electronically Regulated Power Supply Manual (Rev A). uuid:240f7d64-6203-4457-8004-e2040a84a741

pf[tp^(`hVajcg~)xu&N ~pH8KOq %#^3"v\ qhxhXrmelM tx1> Z2|@AqH9,l5@5QM xk)Mi!>b!Lbyq@jba# R$@M`t@;j/-$R! The updatemydynaco assembly manuals typically have all the information you need to make your Stereo 120 better than new. input transformers (from a sheet found in a Thordarson box), to life, to improve it a bit, or to take it about as far as you can go. Has your PAT-4 Preamp always had a hum? P782 S Power Transformer (for Dynaco Mk3 & Mk2, Sunn) MADE IN USA - NEXT RUN READY IN 8 WEEKS, PRE-ORDER YOURS NOW! to prevent damage.

0 See the Stereo 80 Replacement Cap Kit in the store, Set of four vinyl feet. Our engineering team is available to assist with your designs. %PDF-1.6 % Replace them with our, Improve your power supply and get better bass. The capacitors eventually die, and sound suffers. The old design used a number of bipolar electrolytic coupling caps in the signal path. distortion. The following plot compares 1 kHz THD+N versus output power for the old (original) and new (UpdateMyDynaco) designs. 0_%O`?:Qoah]noo\Dz&5$H@%h@`,@ LTspice, an absolutely free, absolutely great spice circuit simulator. output signal levels, like half a Watt. We supply solder and all the hardware youll need. In a few short hours youre ready to listen A. brochure has 5 pdf files of about 6 Mbps each. All shipments are by USPS Priority mail.

4.9 Mb pdf file Replace your power supply and power amp modules with cleaner, quieter, more musical sound. Compared to the original heatsinks, it allows the amp to deliver more power for longer before protective thermal mechanisms trigger. If you're visiting this web site, you probably enjoy Audio DIY as a hobby. Here's a short list: Q. linearity NPO or poly-film dielectrics. Click on the links to download 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. 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.



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