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dynaco

  1. Dynaco 01 - Top

    Dynaco 01 - Top

    2023 restoration of Dynaco Mark III mono block amplifiers.
    • cosme
    • Media item
    • dynaco mark 3 mark iii
    • Comments: 0
    • Album: Dynaco Mark III - 2023 Restoration
  2. moodyj2000

    Dynaco Mark Anything Picture Request

    My listening area is kind of a high traffic high finish area. Anything I place in there needs to be neatly installed and aesthetically pleasing (to my wife). I see a lot of Dynaco Mark III's installed by either laying out on the floor or hidden. Any pictures of these or any mono block amps...
  3. shnaggle

    Dynaco A25 recap

    A few different caps I'm finding available online: 1) Dayton 5.1uF 250V polypropylene on parts-express ($3.29/each) 2) Dayton 5.1uF 250V "precision audio" on parts-express ($5.38/each) 3) MPT 5.0uF 250V polypropylene on ebay ($3.99/pair) Just to be clear: the Dayton 5.1uF's are compatible with...
  4. J

    SCA-35, phase splitter mod

    Recently set up a SCA-35 (with efb and bypassed tone controls) and it sounded different than I remembered (or maybe the same....). Anyways, I took another look at the schematics and boards and came up with a plan. Ditch the positive feedback, balance the phase splitter and give it a new screen...
  5. Y

    Can anyone please help ID this amp?

    Picked up this beauty as my first-ish restore project in no-power, parts-only condition. Not being able to find anything similar, I'm leaning towards this being a very nice DIY build, that reminds me of a Dynaco ST70 or some version of Williamson circuit. I have a slim hope of finding a...
  6. Jason Bolt

    Dynaco A35 History

    I have a chance to get a pair of dynaco a35s. Curious what years these were produced. I have an sx1080, and sl1700mk2. Looking to keep it all late 70s. Anyone with any experience with these? Thanks!! Jason
  7. D

    THE BEST DESERVES THE BEST

    One of the best amplifier designers produced some of the best power amplifiers ever, over fifty years ago! BONGIORNO. My favorites were SAE (Scientific Audio Electronics) and GAS (Great American Sound). One of the BEST technical engineers that knows and understands these amplifiers, and is...
  8. T

    Dynaco ST-70 with Lovan modifications

    Hi to you Dynaco owners. A few years ago I purchased a ST-70 which has been highly modified by "Lovan". I have used it intermittently but it has been idle for a few months while I listened to my MC-40's. Today, I thought I would put it back "on line" and try it with a recently acquired Van...
  9. E

    Please Help ID This Amp

    I‘m hoping that some smart person can identify this amplifier and ??? The big transformers are labeled Dynaco A-440. I don’t know if this is a Dynaco unit or a custom build. There is a second unit which has 6 more big transformers in it. I’m sorry that’s the only picture of it because I just...
  10. Benz

    What was done to this Dyna PAS (1)?

    Greetings, I just picked up a nice Dyna PAS + Dynakit ST-70 combo (my first tube gear, finally). Both units have been restored but I was wondering if the experts here could help me figure out what was done to the PAS as the previous owner wasn't a tech guy and only knew it had been restored when...
    • Benz
    • Thread
    • dynaco dynakit preamp tube
    • Replies: 41
    • Forum: Tube Audio
  11. KiM3Ce

    Clinton Township MI Dyna Sony Maxell TEAC RTR

    No affiliation. TAKE COVID PRECAUTIONS! Arrange a non-contact or minimum-contact sale if you can. For online auctions -- check buyer's premium and terms. https://www.estatesales.net/MI/Clinton-Township/48038/3169461
  12. goldswimmerb

    Dynaco Stereo 150 Biasing

    Hey guys, so i was looking around on this model and saw that the stock bias value is defined as 75ma on the B+ side, I noticed that the Boak-Jung mod defined a 300ma bias at a higher rail voltage, and the stock draw value of 75ma sounds low to me, especially considering the heatsinks don't even...
  13. Tyler Prock

    Recapped better than spec pioneer sx-1010 or…

    May have the opportunity to trade my up to spec pioneer sx-1010 for a dynaco pas3, st 70, and an fm-3 plus a little cash on my end I could really care less on the tuner. So that’s not a plus to me in anyway. But I have been very curious of tube separates lately. I’m running Cornwalls with the sx...
    • Tyler Prock
    • Thread
    • advice dynaco help pioneer solid state st 70 sx-1010 tube amp
    • Replies: 3
    • Forum: Pioneer Audio
  14. Jeff Litt.

    Modified Dynaco Mkiii

    Hello Everyone, To start out, I have visited this forum over the last 3 years for research and information. I finally made an account to post some information about my equipment. This site has been very helpful in research and decision making on my equipment / tube selection. I have a pair of...
    • Jeff Litt.
    • Thread
    • adi ccda dynaco dynaco mk iii dynakit el34
    • Replies: 30
    • Forum: Tube Audio
  15. ADClosson

    ST-70 on the fritz

    I recently had trouble getting my fully restored ST-70 to bias properly. The left channel didn't have enough range to bring the bias within spec. It kept reading high, around 2.5 volts. This issue spontaneously resolved and I enjoyed the amp for a few weeks. Then today the left channel fizzled...
  16. zastin17

    Dynaco ST-70, 1959, Freshly Drawn Hafler Schematic :)

    https://www.dropbox.com/s/k8bo95iab6bc9vu/Schematic_Dynaco St70 Final_2021-09-28.pdf?dl=0 I like to make older Schematic nice a "pretty" for my own archiving, but I rather share it, as maybe its still helpful today High quality PDF available above. Prints out very nice! This does not take me...
    • zastin17
    • Thread
    • 1959 amp dynaco halfer schematic st-70 tube
    • Replies: 4
    • Forum: Tube Audio
  17. Fasturd

    Pair of Dynaco Mark IV buzz. SOLVED

    New to the Dynaco world. My new to me Mark IV amps have an identical buzz that is too loud to ignore. They were partially updated prior to my ownership and did not buzz at the sellers home. I do not know the make of the boards yet but they are currently running 1 Sylvania 6GH8A on each board...
    • Fasturd
    • Thread
    • 120hz 60hz 6gh8 buzz dynaco mark iv problem solved
    • Replies: 69
    • Forum: Tube Audio
  18. SKS

    Wild mods on Dynaco ST70

    Saw this posted on CL near me. https://sfbay.craigslist.org/sby/ele/d/san-jose-dynaco-dynakit-st-70-tube/7370428384.html Filter cap is bigger than the PT (cl post says 20x larger than stock). Has a giant U shaped bus bar, and a bunch of components i cant even identify. On one hand I respect...
    • SKS
    • Thread
    • dynaco st70 tube amp
    • Replies: 26
    • Forum: Tube Audio
  19. Jobby Legs

    Dynaco / Scandyna A45

    Hey guys! I've been a lurker on here for a while now and have learned a whole lot from this forum. Many thanks for sharing the knowledge, it's much appreciated! :D Since lurking, I've bought a pair of Scandyna (Dynaco) A25 which I've recapped and have paired it with a Marantz 1060. They're...
    • Jobby Legs
    • Thread
    • dynaco dynaco a25 dynaco a45 marantz marantz 1060 scandyna
    • Replies: 1
    • Forum: Speakers
  20. kcline

    Current setup in Analog Room System Heathkit, Dynaco/ARC, 45 SET

    This is my current " final" setup for this system. Each amp has its own set of speaker cables, to change amps switch speaker cables and inputs. On floor on marble stand is my 45 SET amp globe 45,s and 6J5-GT tubes with 5AR4 rectifier. Right behind is Heathkit W-3AM monoblocs, they are running...
  21. kcline

    Current Analog Room Setup 45 SET with Arcturus Blue Glass 37-A Tubes

    When I got this amp it came with a 5 pin to octal adapter so a # 76 tube could be used in place of 6J5, I thought at the time that I wish I had some blue Arcturus 76 tubes, those are very hard to find. I have a collection of blue tubes and I remembered that there was a 76 like tube the 37-A...
    • kcline
    • Thread
    • arc dynaco heathkit klisch tubes
    • Replies: 8
    • Forum: Tube Audio
  22. kcline

    Tube related items picked up yesterday.

    Dynaco SCA 35, WE CardMatic Tube Tester with man and calibration cell and cards, also but not shown Zenith Leather TO with the 1L6, hope its good. All but the WE tube tester have various issues but have notes with each what the problems are.
    • kcline
    • Thread
    • dynaco tube testers tubes western electric
    • Replies: 13
    • Forum: Tube Audio
  23. J

    Woofer for Dynaco A25

    Does anyone know of an inexpensive woofer that will fit the Dynaco A25? Apparently, this one might: https://www.parts-express.com/Dayton-Audio-DS270-8-10-Designer-Series-Woofer-295-432 But I'd just as soon not spend that much. The overall speaker diameter is 10 1/4" and the baffle opening is...
    • JLM9999
    • Thread
    • a25 dynaco woofer
    • Replies: 13
    • Forum: Speakers
  24. tahoe_snow

    Dynaco PAS2 phono low frequency filter

    I’ve been working on a Dynaco PAS2. I upgraded the power supply with a board from triode electronics. I was going to call it done as the remaining components appear to be within spec, but I’m having a problem with the phono section. In the left channel there is a very low frequency rumble. It...
  25. O

    New (old) system troubleshooting

    I'm having trouble with a new system I'm building from scratch and would very much appreciate the expert advice of other members. I thought it would be fun to create a new system for my office with all vintage components. For reference, my main system at home is a mix of contemporary and older...
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