The mk iii was set up to handle 6550s and kt88s no more suggestion of using el34s was in the owners manual. Since acquiring the legendary hafler and dynaco brands in 2014, radial engineering has been carefully working on the dynaco st70 series 3 tube amplifier, in an effort to create a truly worthy successor of one of the most. Pas 3, part i saw the stock dynaco pas 3 run for may hours. Also, remember that the mk iii s as in all the other dynaco stuff was designed when the. The first is based out of a concern that was addressed on the sds audio labs page, the capacitors in the mkiii power supply are not rated at a high enough voltage for the power transformer. The sound then was remarkably detailed at low volume, but stressed when pushed harder. Vintage dyanaco mark iii dynakit mk3 monoblock amplifier kt2. Your dynakit mark iii is a complete 60 watt power amplifier. Dynaco mark iii restoration and modification hudson valley hifi. If you own an old dynaco pas2 3 3x and have been wondering what you can do to improve the sound and breathe new life into the preamp, youve come to the right place. Modifications for the dynaco tm mkiii mono power amplifier.
That research sparked a phenomenal thread with contributions by mark, rick, and craig which not only discussed upgrades to the dynaco s but became a lesson on tube amp design, electronics and more. Whether you are looking for replacement bulbs, lighting solutions, towing accessories, audiovideo upgrades or portable appliances, we have just. Dynaco st70 tube amp, upgraded, improved, restored, ex sound, usa. Designed specifically for the original or new dynakit st70, mark iiiii and. Developed over many years, erhard audio is the only and official seller of all these great upgrade kits, spare parts and more. Dynaco dynakit amplifier part 2 how does the mark iii. It uses classa pushpull stereo topography that has long been characterized as a robust, reliable design of exceptional value. Our offerings have the most requested upgrades we sell, built right in. Dynaco mark iii in the march 2001 issue of audio xpress there was an article titled the cure for the common dynaco mkiii. The scan below is the dynaco dynakit mark iii tube amplifier schematic from the instructions manual. How to upgrade a dynaco mark iii a pictorial 2channel. The board uses a cascoded 12au7 into a long tailed pair phase inverter. Dynaco amps were some of the most popular hifi amps ever sold.
The other compelling option i have been looking at is a pair of mc30s. I was fortunate to get a pair of the 60 watt mk iii amps that were factory built. What preamp are you using with your dynaco mk iiis audiokarma. We have merged dynaco designs and the fm3 zone into a single site. Threads started on or before 83106 are archived here. Van parts and accessories van specialties is your number one local shop for all types of van parts and accessories.
Notice we have used the term failsafe bias, this is referring to the way the bias and balance pots are wired to deliver the required bias voltages. Many old stereo 120s have dead or dying amplifier modules. Pair of vintage dynaco mark iii dynakit mk3 monoblock amplifiers kt. Dynaco dynakit amplifier part 2 how does the mark iii operate with kt88 6550 6an8 gz34. The st70 series 3 tube amplifier is 35 wattsperchannel and switchable between both 4 and 8 ohm outputs. Of course there are some deviations from the original design that i will be pursuing. Our st70 kit is one of the best stereo tube amps of all time. Dynaco mark iii mk iii mono block amplifier for sale. The dynakit bbcu1, bias balance control upgrade is a simple and effective circuit.
Rio is a 50 ohm, sw resistor, used rather than the choke shown on the hookup diagram notes for sunn amplifiers. The original workmanship was good and they didnt need a whole lot of work. Dynaco dynakit mark iii mk 3 chassis with bottom kt2. The capacitors in the power supply are not rated at a high enough voltage for the power. Breaking down the components needed and options around them for a restoration of a pair of dynaco mark iii amplifiers.
The dynaco st70 series 3 tube amplifier is now finally. The update kit consists of new amplifier modules that you build. When the mk iii was introduced to drive the power hungry ar 3 speakers, the mk iiis transformer added a 4 ohm tap, changed the rectifier tube to the gz345ar4 which did not sag as much as the 5u4gb, and added a choke under the hood. Dynaco mark iii mk 3 restoration part 1 bg066 youtube. Complete restoration ready for another 30 years of service. Triode electronics sells a nice cap upgrade board for the dynaco mk iii sds labs mk3 capacitor board, blank with instructions. The dyna mkiii has a basic design flaw that none of the other dynaco products have. A high end design with off the shelf parts is far superior to a mediocre design with high end parts. Visit the akitika store if youd like to buy the submodules from a gt101 for your own special projects. They cost about three times as much as the dynaco option and have half the power. Dyna 70ab upgrade with auto bias for the dynaco st70 amp.
Mark3mark2 upgrade driver board with parts one dynaco mark 3 mark 2 upgrade board with parts and instructions. Downloadour comprehensive installation manual to see for yourself just how easy it is. Recently we had an original owner pair of dynaco mark iii amplifiers. Tubes 4 hifi is also known as vacuum tube audio our best known product is the vta st70 pcb modification for the dynaco st70 amplifier, that first appeared in a glass audio magazine article in 1989. And like dynaco, ava equipment is a fantastic value. The 12au7s have lower gain then the tubes used on tubes4hifi, but i think now the tube4hifi amp can be order with a lower gain version now.
Why start with an amp you have to mod, when ours comes fully loaded. Dynaco mkiii mods diy canuck audio mart hifi and audio. 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. After building slightly modernized variants of the dynaco st35 and st70, i felt that the mk iii was the next logical step. Dorey design group ddg dorey design group is a fullservice web design, open source programming, and marketing firm located in portland, or. Hard to find parts including dynakit original dropin replacement components typically ship within 24 hours of ordering. Dynaco mark vi schematic owners manual dynaco fm 1 schematic owners manual dynaco pam 1 schematic owners manual dynaco pas 2 schematic owners manual dynaco pas 3 schematic dynaco pas 3 series ii schematic owners manual dynaco pas 3x schematic owners manual dynaco pas 4 schematic owners manual. This kit is designed to totally rebuild any of the dynaco tube preamplifiers.
Dynaco dynakit mark iii tube amplifier schematic and manual. Will use gold jacks compatible with the jbls and the phase. I cant recall if it was a mark iii or a mark iv, but i saw one with half a farad, that is, 470,000 mfd. The other benefit of the dynaco is that at 60 watts, i could use them with a pair of paradigm studio 100s i have in storage if i didnt like them better than the fisher.
The mark iii s used a different tube set in the driver and i think thats the primary difference. A pair of custom dynaco mk iii monoblock amplifiers. Like dynaco and early hafler gear, audio by van alstine makes much of their equipment available in both factory assembled and kit forms. I havent made any crazy mods to the pas 3, just required mods to upgrade. The dynaco dynakit mark iii amplifier is rated at 60 watts. Get the best deal for dynaco vintage amplifiers and tube amps from the largest online selection at. You may also purchase the board and parts as a kit. Dynaco mk iv monoblocks curcio update modules ebay. Update my dynaco store everything you need to update your stereo 120, sca80q, stereo 80, pat4, pat5, fm5, or af6, and now the gt102 power amplifier kit. The dynaco st70 series 3 delivers the very soul of high fidelity. In addition, we offer an array of new select dynakit classic vacuum tube. The basic modification consists of replacing the driver board, performing easily done minor modifications revising a few connections to the output tubes, and installing to the power.
There was a nigher power amp the mark vi, but it wasnt widely available. Dynaco st70 series 3 tube power amplifier the absolute. Dynaco vintage amplifiers and tube amps for sale ebay. Get the best deals on dynaco vintage amplifiers and tube amps when you shop the largest online selection at.
Modifications for the dynaco tm mkiii mono power amplifier basic features. We provide the best audio products money can buy at a price anyone can afford. Here at dynakit you will find the right parts to restore, repair or upgrade your original dynaco vacuum tube amplifier. My dynaco mkiiis are the dynakitparts version and i use the high gain tubes4hifi driver boards which use three 12at7s. Our update kit for the dynaco stereo 120 lets you rescue your dynaco from demise in the dumpster and make it better than new. Hotrodding dynaco mark iii tube amps clevelands forever. Dynaco pc 3 board original for st70 amplifier repaired upgrades and tested. Replacement input jacks, output binding posts and other useful items for your dynaco can be found on our parts page. Well worth using if you are going to use the amp for bass. Dynaco pas 3, part ii letter from nyc 84 2018 10 revised mar 11, 2018. Dynakit mk iii dynaco mark 3 tube amp kt88z treasure gz34 mullard serviced. Kara chaffee described a modification for the mark iii which replaced the 6an8 driver. Replacement tubes for your dynaco may be found on our tube page.
The van alstine super pas 3 i built in 1990 still worked fine as did my old. Dyna 416 pc28 boards or parts machine, charles218, swap meet. You recycle the power supply and chassis, and replace the old amplifier modules with the new. I ordered the boards and components as a kit and sourced the coupling capacitors from mouser. The dynaco mark iii is the highest power amplifier that was widely sold under the dyna name. That was in the days where a 4700 450v electrolytic was the size of a soup can. Also going to replace the single tube pc board with the troide electronic dual tube upgrade board. Dynaco mark iii restoration and modification hudson. The dynaco dynakit mark iii is a monoblock amplifier with a 6an8 input stage and a pushpull kt88 output stage. Their popular models include the stereo 70, stereo 35, mark iii, and mark iv. The triode board can use any common tubes, and i think that is what makes it a good design. On the original dynaco circuit, if the bias pot wiper. Recently we had an original owner pair of dynaco mark iii amplifiers brought to us for restoration and modification.
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