In a vta st 70 st 120 tube amp kit, the vtatdb replaces the 3 lug terminal strip. Feb 01, 2017 dynaco has sought to preserve the considerable virtues of the original 70 while making fullest use of much better and more modern parts plus advanced circuit techniques. Triode electronics sttriode electronics st70 70 capacitor. If the page is blank click here original dynaco st70. The 6bq5 output stage is pushpull and the dynakit st35 amplifier is rated at 17. Actually the m125 is even easier to assemble than either the st 70 or st 120 amp kits. Theses are not the same manuals provided with our dynakit amplifier kits. Triode, usa customer service mf 9am4pm ct 18007743201 email us anytime. The dynaco stereo 400 is a basic power amplifier employing all silicon solid state devices. Need a bottom cover for your existing st 70 chassis. The original dynaco stereo 70 is a true classic still regarded with awe by. Read or download dynaco st 70 service manual pdf with 18 pages. Dynaco dynakitst70 below you will found our manuals on the dynaco dynakit st70. Dynaco st70 quadcap upgrade assembly, installation.
Dynaco began producing audio equipment in the mid 1950s but is now a part of the panor corporation, distributing audio and video home entertainment products from major manufacturers. Sep 06, 2014 scan of the dynaco dynakit stereo 70 st70 tube amplifier schematic from the instructions manual. Introduction thanks for your purchase of our st 70 quad electrolytic capacitor replacement board. View and download dynaco st70 instruction manual online. This site helps you to save the earth from electronic waste. View and download dynaco sca35 instruction manual online. The service manual functions as a repair guide for troubleshooting and sometimes contains tips for. The stereo 80 was the little brother of the stereo 120. When comparing old 70 with new 70, one cannot help but notice the external similarity i. It is being included here to allow the owner to experiment, and. Dynaco stereo 70 owners manual pdf download manualslib. Free downloads of original dynakit assembly manuals with full schematics and pictorials in adobe pdf format.
Dynaco stereo 70 st 70 amplifier service assembly manual original item information. It has come to our attention that an ebay seller has been offering an st 70 replica stainless steel chassis which upon closer inspection reveals that the quality and finish are extremely poor. The owners manual is used as an reference guide, instruction manual and instruction book. Copy dynaco dynakit stereo 70 st70 instructions for. Eventually most of these chassis will develop rust spots. Dynaco dynakit stereo 70 st70 tube amplifier schematic and. Solder all resistors onto the board where indicated in the parts list. Tools required before you begin you should have a few basic tools on hand to help you identify and repair the problem.
Online instruction manual with step by step build instructions. Worse, direct replacements are both expensive and offer no improvement in reliability. This manual covers 4 configurations of power supply and amplifier circuit boards. In their early years audio research built the arc st 70 c3 as a kit for the legendary dynaco st 70 and later as a factory mod. A gz34 5ar4 rectifier tube is used in the power supply. If the output tubes are old, it may be impossible to adjust the bias pots to bring the voltage up high enough. The schematic is a technical drawing or diagram of your system, a perfect supplement to the service manual. The chassis is about the same size as the st 70 st 120 but there is only the wiring for one channel instead of two channels. Copy dynaco s stereo 70 st 70 instructions for assembling operation manual. Scan of the dynaco dynakit stereo 70 st70 tube amplifier schematic from the instructions manual. Physically built as well as any amplifier out there quality and heft. Sep 06, 2014 dynaco dynakit stereo 35 st35 tube amplifier schematic.
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. If the page is blank click here original dynaco st70 manual. Dynaco st70 4xel34 sch service manual download, schematics. The ava enhanced pure vacuum tube amplifier for your original dyna st 70 chassis. The dynakit stereo 70 is a complete dual 35 watt power amplifier kit which offers the highest. The service manual functions as a repair guide for troubleshooting and sometimes contains tips for refurbishing and modifications. The dynaco pas3x stereo preamplifier is a versatile two channel control center which permits either monophonic or stereophonic reproduction from any program source rec ords, tape, microphone, radio tuner with any modern amplifier. Dynaco st 70 below you will found our manuals on the dynaco st 70.
They include 46 transistors, 47 diodes, 2 silicon controlled rectifiers, and 4 integrated circuits. Free dynaco diagrams, schematics, service manuals schematics. This is the size transformer we are using in our test st 70 and weve had no issues with using this size. Below you will found our manuals on the dynaco dynakit st 70. Arc st70 restoration analog engineering associates. The st 70 series 3 builds upon the proven design philosophies of the original david haflerdesigned stereo. Eico st 70 has a couple of plain dumb glitches introduced by the manufacturer, but all the major mods for them are well described on the net and are fun to implement. For more information please see our dynaco page blank board means just that, you supply the parts.
Dynaco amp schematics to assist you with your amplifier repairs and modifications. This is the 26 pages manual for dynaco st 120 service manual. The ultimate 70 is a ava circuit set for the dyna st 70 chassis that goes far beyond the original dynaco design. Pa060s power transformer nearly twice the lamination stack size of the original, a470s output transformers, c354 choke. The dynaco st 70 series 3 which is, without question, the most successful tube amplifier of all time, has been redesigned and relaunched.
Dynaco dynakit stereo 70 instructions for assembly pdf. Dynaco st 70 stereo 70 stereo 120 stereo 35 pat4 sca35 pas pas3x pas3x. It discusses most of the typical and a few atypical problems that may be encountered with the restoration of the. In a stock st 70 the board replaces lugs 5, 6 and 7 of the 7 lug terminal strip. Dynaco sca35 schematic user manuals and owners guides. Make sure to have the banded end as marked on the pcb board banded end facing edge of board 3. Dynaco stereo 70 series 2 pdf manual and electrical. Dynaco stereo 70 hifi engine owners and service manuals. This is the 22 pages manual for dynaco sca 35 owners manual.
Service manuals, owners manuals, schematics, diagrams, datasheets, brochures online for. Please note that it will be sold on a first come, first served basis. All parts needed for a complete upgraded dynaco st 70 type kit except for the tubes. To view this site, you must enable javascript or upgrade to a javascriptcapable browser. This manual covers the replacement of the stock c12, a 3300 f capacitor, with a total of 20,400 f. You can get seriously highend sound out of your dynaco stereo 120 power amp, pat4 preamp, or sca80 integrated amp. Dynaco stereo 70 stereo power amplifier kit manual hifi. Over the years, we have received may requests asking for service and upgrade help with the longoutofproduction dynaco st 70 vacuum tube power amplifier. Dynaco dynakit mark iii tube amplifier schematic and manual. Jun 28, 2016 the assembly manual for the vta st 70 is written in detail for the beginner just like the original dynaco st 70 assembly manual. Introduction this document provides a step by step instruction for rebuilding and restoring the dynaco stereo 70 power amplifier.
At some point in their production run dynaco began supplying the factorywired versions with a smaller sized manual mine is large 8x10, rivets instead of screws in places, spannerscrews on the bottom plate, a cage over the circuit board, and a sticker on the back. Dynaco st70 below you will found our manuals on the dynaco st70. The vtatdr may also be easily retrofitted to any vta st 70 st 120 tube amp kit. The dynaco st 70 series 3 tube amplifier is 35 watts per channel and switchable between both 4 and 8 ohm outputs, with classa pushpull stereo topography, that has long been characterized as a robust, reliable design of exceptional value. View and download dynaco dynakit stereo 70 instructions for assembly online. Dynaco had two types of pa 060 power transformers they used. It uses a patented circuit of outstanding performance characteristics, along with top quality parts, including the new dynaco superfidelity a470 transformers the finest available. The tubes4hifi version was done in a similar manner to this. As with the st 70 and st 120 amp kits, the assembly manual is written in detail for the beginner. Sds labs and triodeelectronics power supply boards. Service manuals, schematics, eproms for electrical technicians.
Then dynaco came out with a transformer with a notably higher stack, about 1 34 44. Download the dynaco dynakitst70 manuals for free hifi. Tubes 4 hifi is also known as vacuum tube audio our best known product is the vta st70 pcb modification for the dynaco st 70 amplifier, that first appeared in a glass audio magazine article in 1989. They completely did away with the factory dynaco circuitry in the st 70, using only the chassis and transformers from the original amplifier the result was a stellar amplifier unique in tube amp history. You will require adobe acrobat pdf reader to view these schematics. Dynaco stereo 70 st 70 amplifier service assembly manual original sign in to check out check out as guest. Dynaco stereo 70 stereo power amplifier kit manual hifi engine. The sonic upgrade will be immediately noticed from a stock dynaco st70 type amp. The el34 output stage is pushpull and the dynakit st70 amplifier is rated at 35 watts per channel. Including our custom made transformers, which are made to original specs right here in the usa. Service manuals, owners manuals, schematics, diagrams, datasheets, brochures online for free download and free to your amplifier, receiver, tape, cd, tuner, turntable and recorder. Review and measurements of dynaco st 70 audio science.
Stereo 120 had an electronically regulated power supply and larger power transformer. It has been designed to replace the original dynaco quad 4 section aluminum electrolytic capacitor. The pa 060 transformer used in the very early kits had a very low stack about 1 25. The dynakit stereo 70 is a complete dual 35 watt power amplifier kit which offers the highest possible fidelity, at low cost and in a compact arrangement. Stereo 70 owners manual full stereo 70 repair guide. We are very familiar with laser cutting of stainless steel. Output tube changes the original triode electronics board design manual included modifications to this board and to the amplifier to allow using other output tubes in a st 70. To view this site, you must enable javascript or upgrade to a.
Download the dynaco st70 manuals for free hifi manuals. Please obtain the items outlined in the following list. Some controls and terminals functions and positions are confusing, to say the least, but what do you expect from the 60s technology, when no quality ergonomics or user. This preamplifier design is most renowned for its low noise and low distortion, and it provides striking simplic.
One of the most frequent failures in the dynaco st 70 is the original quad electrolytic capacitor. Chassis the original st 70 chassis was made of 18 gauge nickel plated regular steel. Triode electronics dynaco st70 tube amp service manual. Make offer dynaco stereo 70 st 70 amplifier service assembly manual original. View and download dynaco stereo 70 owners manual online. Dynaco stereo 400 hifi engine owners and service manuals. It has been said that only 5% of the st 70s were factorywired the rest being kits.
This copy has some minor cover and edge wear, but otherwise in good condition. Power supply amplifier modules upgrade kit dynaco dynaco c12dd updatemydynaco dynaco c12ud. St 70 capacitor board installation instructions populating pcb board 1. Dynaco st 35 schematic service manual dynaco st 70 ii schematic owners manual. Visit us online for more information or to download service manuals today. Dynaco dynakit stereo 70 st70 tube amplifier schematic.
Dynaco manuals hifi engine owners and service manuals. Scan of the dynaco dynakit stereo 35 st35 tube amplifier schematic from the instructions manual. The measured specifications show that the stereo 70 is an amplifier of unequalled performance, and its listening quality is also unrivalled by any regardless of price. You can purchase any of our products here from these web pages, making payment with a credit card through paypal, or sending us a money order. Mcintosh schematic dynaco 1964 stereo 70 pas 2 fm 1 tube ad 1 page tuner amplifier articles deemed by a difference of no more than 2 % deviation from the xformer with loadand withoutnt. Dynacodynakitpreampom pdf dynacodynakitst70om pdf dynacofm1 ownersmanual pdf dynacofm3ownersmanual pdf dynacofm3schematic. Vancouver, bc dynaco a division of radial engineering ltd. Hafler perfecting high fidelity audio for over 60 years.
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