Of course you can use these for doityourself preamp projects, it will power up to 4 12ax7ecc83 or similar tubes. Dynaco vintage tube ampllifier technical articles, upgrade, restoration and repair resources for st70, pas, sca35, st35. The dynaco pas 3x 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 pas3x tube preamp whats best audio and video. Dynaco st70 series 3 advanced classic tube aplifier. Replacing the feet is quite easy if your dynaco feet are held on with screws. Dynaco pas tube preampthis preamp has been updated. Your pas 4 was designed and built entirely in the usa. Dynaco pas3 tube preamp mods and parts as of april 2015, tubes4hifi has turned over all business relating to dynaco pas preamp upgrades to erhard audio all upgrades, modifications, and various parts will be available thru the erhard audio website here. The pas 3 series ii includes as standard a true state of the art phono preamp section and full provision for tape dubbing for the home recordist. Ive been considering mustard caps, orange drops, solen, and maybe even auri caps. The newest of these is currently approximately 28 years old.
Tube phono stages, i think the pas was a little noisier than sota but quite acceptable. Im thinking of upgrading the stock coupling caps in the phono section of my dynaco pas 3 preamp. The second time around i rebuilt a pas 3, with boards supplied by ava and my own parts, the same that went in the finalized version of the pas 2. Overview dynaco, pas 3, conrad johnson pv5, blogger. You can get seriously highend sound out of your dynaco stereo 120 power amp, pat4 preamp, or sca80 integrated amp. The pas is a very pleasant preamplifier and with a sds power supply board, new coupling capacitors and tone control bypass it does a competent job. This board is a must for any serious restoration of the dynaco stereo70 to full stock condition. A classic dynaco pas3 preamp that needs a little work done on it.
Dynaco pas3 preamp troubleshooting and volume mods youtube. Either the 12x4 tube rectifier or solidstate diodes may be used. Many old stereo 120s have dead or dying amplifier modules. The least expensive is for an owner of a pas to order the ava upgrade kit. Van alstine super pas 3 preamp kit rebuilding a vintage dynaco preamp part ii italian version product. This unit had been modified to just be a phonograph preamp. I used to enjoy the sound of these preamps many years ago but a few issues have kept me from using them these days. The 3 and 3x are very similar and here is a good article on how to tell as 3 from pas 3x.
Threads started on or before 83106 are archived here. You recycle the power supply and chassis, and replace the old amplifier modules with the new. I recently bought a dynaco pas 2 from ebay and began restoration. The phono preamp zpc6 as well as the line preamp zpc5 use 2x 12ax7s each. The eico will really allow your other components to show their inner beauty. Premium pas upgrade kits to bring your old dynaco pas back to life with modern tube circuitry o fhigh quality from erhard audio, the only official supplier. This is the next step up from the original dynaco circuits. The pas is still a popular model, both in stock form or as a platform to be tweaked and modified. Our update kit for the dynaco stereo 120 lets you rescue your dynaco from demise in the dumpster and make it better than new. Protect against wind, precipitation, dust and extreme temperatures while saving energy with a tight seal around the full perimeter of the door. My pas 2 is the later model that looks just like the pas 3 and all the caps have been replaced. Threads started on or before 63006 are archived here. In 1968 after a month or so lifeguarding during the summer, i got the stereo bug to upgrade from my 15w bell mono amp and homemade subwoofer system using a 15inch electrostatic woofer powered by the old mono fisher amp, and orderd a dynaco st80 integrated ss amp, pair of ar4ax and. Phono upgrade 23 pages amplifier dynaco pwramp80 assembly manual.
Weve designed the exterior dynaco all weather m3 high performance door with a superior seal, making the door wind resistant up to 110 mph. It reduces the current load on the transformer making it run cooler. Look at the following table to get a glimpse of what they offer compact and sleek, the live cam notebook pro vf0400 is the perfect companion for the savvy traveler on the go. Dynaco pas 3 stereo tube preamp wphono new 12ax7 tubes tested 1910. People might say that is crazy, but i love this dynaco pas 3. It is a small shop that also designed and manufactures beautiful sets of boards. One to fit behind the faceplate jewel, and one to fit the plate itself. The pc board designs were done by arn roatcap in sunnyvale, california. Classic dynaco pas 3 s can be a source of many hours of entertainment, or it can be a hassle piece that hums, etc and actsup. Dec 05, 2008 the audio by van alstine version could either be based on the customers own dynaco pas, or made from new parts. Threads started on or before 43006 are archived here. Geek, who runs classicvalve, is now offering the norman koren boards for sale, calling them the norman koren pas purist mod as it eliminates the tone controls from the original pas 2 3 3x design.
The task of updating the circuitry for the vacuum tube stereo 80, stereo 160, and pas 4 was accomplished by john nunes in san jose, california. Like dynaco and early hafler gear, audio by van alstine makes much of their equipment available in both factory assembled and kit forms. I have a couple of older dynaco pas 3 preamps around. Dynaco pas3 stereo tube preamp,phono,maximum upgrades,ex. Dynaco pas3 series ii manual vacuum tube preamplifier. How to replace volume pot in dynaco pas audiogon discussion. And like dynaco, ava equipment is a fantastic value. First is our stereo70 upgrade system on board sob a complete amplifier on pc board.
Sep 19, 2007 im thinking of upgrading the stock coupling caps in the phono section of my dynaco pas 3 preamp. Dec 08, 2004 just replaced my stock dynaco pas 2 with a pas 2 rebuilt with van alstine super pas 3 modifications. Seeking input on upgrading coupling capacitors on my. View and download dynaco pas 2 assembly instructions manual online. I now have 2 virtually brand new pas preamps with some important upgrades. Dynaco pas2 assembly instructions manual pdf download. Visit us online for more information or to download service manuals today.
Dynaco pas3x troubleshoot post by macshifi 23 oct 2017 19. Guaranteed to meet or exceed published specifications for the original dynaco unit. The dynaco pas2 3 preamp upgrade kits we offer are the best available on the market. Amplifier and power supply upgrade 36 pages amplifier dynaco pat5 assembly manual. As of april 2015, tubes4hifi has turned over all business relating to dynaco pas preamp upgrades to erhard audio. These boards will be introduced over the course of 20, as quickly. The dynaco st70 series 3 delivers the very soul of high fidelity. It sounds really, really nice with my office cornwalls and my antique sound lab av8s 8 watts. 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. Developed over many years, erhard audio is the only and official seller of all these great upgrade kits.
You will need to use one of our regulated power supply kits, details of which can be found on our power supply kits page. Dynaco pas beautiful restoration, upgrades, and repairs. Seeking input on upgrading coupling capacitors on my dynaco pas 3. Dynaco pas3 as phono preampphono stage steve hoffman. I had a dynaco pas 2 and a pas 3, and they dont even compare to the sound of the eico. The original dynaco pas 2, 3 and 3x preamplifiers include a low level amplifier board pc6 that provides the necessary amplification and equalization. I just had 2 dynaco pas tube preamps completely restored by a firm called dynaco designs. Dynaco upgrade and restoration boards from the discontinued audio regenesis product line are still available, as bare pc boards only, from d. This entry was written by admin, posted on may 29, 20 at 3. I have been to the dynaco doctor site and it is quite helpful, but i didnt see anything on the volume pot.
This kit will dramatically improve the performance and sound of your fm 3. Vintage dynaco aluminum, pas 3x stereo 12ax7 tube preamplifier preamp nice. Dynaco pas3 tube preamplifier, upgraded, with added. I run a dynaco pas 3x in my second system mcintosh 250 dynaco pas dynaco af6 tuner kef q60 speakers panasonic linear turntable and pioneer cd player. John used the tlees with his own additional mods, such as passive riaa, better power supply, etc as a phono stage. From their own published riaa response plot, and advertisements, it seems clear that dynaco expected high quality phono reproduction from the pas preamplifier. The venerable dynaco pas is perhaps the most famous stereo preamplifier of all time, much like the dynaco st70, it introduced the magical sound of tubes to thousands of audiophiles throughout the past decades. I was wondering if anyone here has done something similar. While i have a couple of st70s a pas 3, pas 2x and an fm 3 that i am trying to find the time to do some upgrades modifications to, the gear i use the most is surprisingly a st120pat4 with a technics st7300 tuner running through a stacked pair of a25a10s. For those wondering about the mods to this unit, they were factory mods done by one of the designers. Some of you may recall the trevor lees mod for the famous dyna preamp. The update kit consists of new amplifier modules that you build.
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. New stuffed board dynaco pas preamp pc5a line level. Dynaco tube amplifier technical articles and upgrades st70. John used a highly modified dynaco pas 3x for years. Follow any comments here with the rss feed for this post.
All upgrades, modifications, and various parts will be available thru the erhard audio website here. Large exterior high performance door dynaco all weather m3. Here you will find all the boards you need to restore your small dynaco amplifiers, and upgrade them with new power supply boards, which include the popular efb modification that provides greater power output, lower distortion, and extended tube life. Dynaco pas3 stereo tube preamp,phono,maximum upgrades,ex sound,quiet, see pics. This small clever pc module monitors and controls the bias setting in every one. This kit provides 6 3300 uf capacitors that you arrange in a dynaco dynamite capacitor triple. For guitar you could build a fender front end clone. Pas 3, part i saw the stock dynaco pas 3 run for may hours.
I rebuilt two dynaco pas preamps with ava rebuild kits. A totally renovated pas of purist persuasion outfitted with a 12au7 design and a rca orthophonic phono stage from the old 1950s rca tube manual completes the electronics. I have a new audio taper pot on the shelf, but he would have to turn his pas 3 off for about an hour, which doesnt seem likely. While a totally new design,the series ii has in common with its illustrious predecessor the original pas 3x the same striking simplicity of operation, conservative design, fullfeatured operation, spartan beauty, and dyna tradition of value. These replacement feet fit pretty much all the dynaco equipment. When i took the dynaco pas 3 out of my system and put the eico in, it was like night and day. Replacement power supply rev e hardware 18 pages amplifier dynaco sca80 manual. This kind of flexibility and full featured styling is without parallel in affordable vacuum tube preamps. Developed over many years, erhard audio is the only and official.
Both the zpc6 phono and zpc5 line preamps offer vastly improved circuits and performances over the original dynaco designs, with far superior sound reproduction. For a manageable background, read radiomuseum and this article titled the most important preamp in the world. Introduction both solid state and vacuum tube designs regardless of price. We provide the best audio products money can buy at a price anyone can afford. I even have a bunch of little pamphlets with various mods in a box someplace. Threads started on or before 123105 are archived here. Pa211 power transformer dyna pas for dynaco replacement made. A high end design with off the shelf parts is far superior to a mediocre design with high end parts. You will need to use rev e or later of the updatemydynaco upgraded power supply for the pat5. I know there are some audio comapnies that do the upgrades. We have merged dynaco designs and the fm3 zone into a single site. By combining outstanding output transformers with simple but effective circuitry, they deliver audible performance that is comparable to some of todays highly regarded amps and preamps costing much more. Its flexibility and fullfeatured styling is without parallel in affordable preamps.
It uses the 7199 circuit from the original it is not a redesign using the inferior 6gh8. The dynaco pas 2, for those who are unaware, is a pre amp kit introduced by dynaco in 1960 to compliment the stereo 70 st70 that came the year before 1959 and other various other power amplifiers in the companys lineup. Sds labs capacitor board for dynaco pas, with parts. Staring at the innards, i saw both pc boards pc5 and pc6 were affixed to the chassis by 4 screws, bolts and washers. Developed over many years, erhard audio is the only and official seller of all these great upgrade kits, spare parts and more.
If you care to sharpen your electronics skills, getting a used one and completely upgrading it to modern parts can make a dramatic improvement in overall sound. Its mounting holes and connections points are identical to the dynaco pc3 making installation and wiring a snap. From what i read, these boards are a much more modern sounding design, with more detail and clarity than the stock boards. The sound then was remarkably detailed at low volume, but stressed when pushed harder. Finally, a precision engineered reproduction pas chassis plus an array of exact fit components worthy of your next diy project. Dynaco tube amplifier technical articles and upgrades st. Test dynaco pas 3 pas 2 preamplifier and hafler dh200. Background as with many things dynaco, there is an incredible amount of info available on the internet. Threads started on or before 22806 are archived here.
Dynaco pas 2 w van alstine mods the klipsch audio community. Make your dynaco stereo 120 power amplifier better than new with these kits. This is a high quality kit for your pas preamp that allows enough space for better quality rca cables to be used and a new switch to replace the tired, old, noisy, space consuming switch currently residing in your preamp. Rated at 35wpc, the new series 3 s updates and upgrades include the use of more advanced engineering and higherquality modern parts.
Dynaco pas 3 preamp 2channel home audio the klipsch. In this classa pushpull design, 12au7 dual triode tubes are used in the front end instead of 7199 pentodes. Most of the controls were bypassed, but i never used them anyway. I tried to tackle the biggest problems using parts i had around. Dynaco pas 3, part ii letter from nyc 84 2018 10 revised mar 11, 2018. The dynaco pas23 preamp upgrade kits we offer are the best available on the market.
As such, the individual parts can be wildly out of specification or beginning to fail. Dynaco pas3x modifications amplifierspreamplifiers us. Some of the earlier units do not follow the riaa curve and were tweaked. Comments are closed, but you can leave a trackback.
Make offer dynaco st 70 tube amp with upgrades and mods. I replaced the cheesy rca outs with cardas w rhodium flashing and did the same for the mkiiis, which also now have. We offer three 3 faceplate versions for your original or new dynakit pas chassis. Dynaco pas3 preamp modifications larger schematic opens in a new tab if youre more ambitious and would like to really do things the right way, check out my friend norman korens detailed analysis and redesign of this preamp. John used a highly modified dynaco pas3x for years. I ordered a 100k ohm volume control with loudness tap, new polypropylene capacitors and metal film resistors plus a new modern function switch that is much smaller than the oem switch which had been removed. He bought 7 amplifier modules, 3 power supply regulators, and 3 power transformers.
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