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dynaco

  1. AnalogueDude

    Swap out Dynaco A25 tweeters with Advent Loudspeaker orange tweeters?

    Looking for some advice. If I want to swap out my Dynaco A25 tweeters and put in Advent Large Loudspeaker orange "egg" tweeters. Is that a simple swap out by just wiring out and in the new tweeter in the A25 cabinet or do I need to check the crossover/replace it? Thoughts? Anybody done this -...
  2. bberkom

    PAS 2 - New volume control issues

    I have been gradually restoring and tweaking a PAS 2 over the last several weeks. Replaced the can cap, swapped the rectifier for some diodes, and recapped the stock circuit. The first modification I made was removing the tone controls from the circuit, following the Audio Regenesis...
  3. thorpej

    Location of screen taps on Triode A431S output transformers?

    House is still a construction zone, meaning my garage is not usable yet, and it's driving me nuts. But if I can't build, at least I can put thought experiments to paper, so another amp is on the drawing board. I'm planning a 6550-based ultra-linear amplifier, and I'm considering using the...
    • thorpej
    • Thread
    • 6550 a431 dynaco ultra linear
    • Replies: 2
    • Forum: Tube Audio
  4. TellMeWhy

    Mystery Dynaco 3-ways- what are they?

    Hi there... Can anyone identify these (possibly early) Dynaco's please? 3 Way, no port, 8 ohm, same size (and apparently cabinets and grills) as A25XL, 4 position tweater control on the rear. Any comments or knowledge of them gratefully received. Cheers, Jon
    • TellMeWhy
    • Thread
    • a25xl dynaco vintage speakers
    • Replies: 25
    • Forum: Speakers
  5. Ned Sheats

    Misdirected and confused

    A Dynaco PAS2 repair turned into a rebuild. Seeing as I am going to make it as good as possible I looked up an article by Mr. Carole (CAE) about improving the RIaa equilization. Now I am going to ask a question. Is anyone willing to stick with me on this because what I am finding is what he...
  6. adriantsui

    PAS-3 tape output when off?

    Hi everyone, I am thinking about getting a Dyna PAS-3 as I want to make the final step in making my setup fully tube from A to Z. Currently I am using an SP-9 mkii (a tube/SS hybrid) as my preamp. When I am not intently listening to music (podcasts etc) and want to save my tubes, I have the...
  7. mique

    Dynaco a25 questions (should I service or not)!?

    I bought a beautiful pair of Dynacos on Ebay. After discussing on "solid state" forums... I bought a Luxman amp. I'm a rookie :) I had a KRK powered speakers before that, but I wanted to dig into vintage audio to get a better and warmer sound for my living room (and not paying a fortune for...
    • mique
    • Thread
    • dynaco luxman
    • Replies: 8
    • Forum: Speakers
  8. realjimjim

    Free New Big Score: Dynaco ST-70 Dynakit & Preamplifier

    We were on our way to Long Island from Virginia to visit our daughter and stopped into Philadelphia to visit my long time old buddy. As we jabbered away to catch up, the subject of guitars, amps, music came up which led to stereos. He tells me he's downsizing and going all MP3 thus he is getting...
  9. B

    Looking for Audio Amateur Jan 1983 back issue

    Hello, I'm looking for either a hard copy or good scan of the January 1983 issue of The Audio Amateur magazine article about modifying a Dynaco FM-5 tuner. I have no details of which page or even if I have the correct issue; I'm basing this on previous forum posts. Please contact me at w1icw at...
  10. musichal

    ST-70 Custom Died - Where To Start?

    Perhaps I just found why I shouldn't own a tube amp. Music was playing, at low-ish volume. My wife was standing beside the amp and I was looking at her, in conversation. There was no flash, no pop or buzz or noise of any kind. No odors. The music quit playing, the tubes faded. Won't fire...
    • musichal
    • Thread
    • custom dynaco musichal st-70 tube amp
    • Replies: 187
    • Forum: Tube Audio
  11. LoudInTn

    Another awesome find today!

    Just got home with my super sweet $20 purchase of two absolutely perfect dynacos with 5 setting knobs and perfect surrounds. I had to pry this one open because it has a loose post. They look great, can't hook em up till tomorrow though, kids are asleep :-( Thanks so much for the dynaco threads...
  12. LoudInTn

    Dynaco? If so which ones?

    Hey guys I just got offered these speakers on the cheap and was wondering which model they might be and what I should offer for them? Any advice on them at all is much appreciated since I will go pick them up or not tomorrow based on public opinion.
  13. Ron Joiner

    Dynaco SCA-80Q I thought my troubles were over

    SCA-80Q Blown Resistor (5) by Ron Joiner posted Sep 13, 2016 at 10:51 AMSCA-80Q Blown Resistor (4) by Ron Joiner posted Sep 13, 2016 at 10:51 AMThis past spring I resurrected this old integrated amp from the basement. It immediately developed a loud hum. I addressed this by replacing many of the...
    • Ron Joiner
    • Thread
    • capacitor dynaco power amp repair resistor sca-80q
    • Replies: 4
    • Forum: Solid State
  14. pantoramasan

    Any opinions on Cooling fans for Tube Amps?

    I want a very quiet fan for my tube amps. So far everything I tried does not offer the whisper quite I would like. Anyone have a link to good quality quiet fans? Thanks!
  15. gdmoore28

    Help Identifying a Tube Amp

    The short backstory: My old WWII electrician friend recently passed away. He was the only other person in our small southern town who was a fellow audio enthusiast. Before he died, he sold me all of his NOS Altec and University speaker components. Last week, I finally received his two tube amps...
  16. gvocale

    Dynaco ST-70 / Mark III / Mark IV - Which board to accept 12ax7?

    I came in possession of a Dynaco ST-70, a Mark IV and two Mark III. I am considering modding these amps, currently using their stock boards, with input boards which would allow me to use 12ax7 and 12au7. I have in fact a good collection of old ones of those and I would like to use them. I...
  17. kve777

    Van Alstine MOSFET Amp Info Wanted

    I picked up this "Dynaco Mystery Amp" from a fellow AK'er recently and found the boards are VanAlsine PC-489, and the outputs are Hitachi 2SK134 and 2SJ49 MOSFET's, but can't seem to find out anything more about it, like a model # or specs. Apparently it's about 55 WPC or so, based on the output...
  18. TravAndAlex

    Dynakit ST-35 - quiet static (popping noise) in one channel. Help!

    Hi. I'm hoping you can help me. I have a Dynakit ST-35 kit that I've used daily for a couple years. I love it! Unfortunately, today I noticed that one channel has an occasional static noise (quiet popping sort of noise). I tried disconnecting the pre-amp and I swapped tubes left to right...
    • TravAndAlex
    • Thread
    • dynaco dynakit st-35 troubleshooting tube amp
    • Replies: 101
    • Forum: Tube Audio
  19. James Harco

    If you had your choice.

    I need some advice. Apparently I suffer from "audio gear acquisition syndrome". That said? i'm shopping for another amp. My options are Hafler 200, Adcom 535, Adcom 545, and lastly a Dynaco 410 (wish it was the 400, love the blue light dial kit). All are about the same price given how far I...
  20. bighitbomber

    Dynaco A25xl Restoration - Pics are free!

    Good day Audiokarma! Since I have found this forum, I have learned alot from you all and probably have found one of the friendliest forums around! Since I am a vintage newbie and have not yet learned enough to share knowledge, the least I can do is share my experience with you all! I had...
    • bighitbomber
    • Thread
    • dynaco dynaco a25xl restoration speaker stand
    • Replies: 41
    • Forum: Speakers
  21. Ron Joiner

    Dynaco SCA-80Q distortion on one side

    I have had this amp a while and decided to eliminate the hum by replacing the C9 and the C11, which I have completed. All the voltages are within specs. No more hum, great! However, I am getting distortion on one side which may have been there before I started the upgrade (perhaps I didn't...
  22. J

    My DYNA PAT5 preamp repair thread

    This thread will document my repairs to the PAT5 Pre-amplifier as a spinoff of my other AMP thread http://audiokarma.org/forums/index.php?threads/st70-7199-6gh8a-amplitude-vs-frequency.694384/ This is my solid state preamp for the ST70. Which naturally, doesn't work correctly. My other is the...
  23. primosounds

    Converting a PP EL34 cathode biased amp to fixed bias, what changes?

    I have a PP el34 amp with Dynaco A420 output transformers. These are UL OPTs as it is installed in the amp. B+ currently is 420vdc, with 4 individually biased output tubes. I have installed, but not implemented, a negative bias supply which can supply -88vdc. The front end consists of a 6sn7...
  24. S

    Help: Dynaco PAS 3 Hum

    Hi, First time post here and thanks in advance for your time. I use a PAS3 preamp in a couple of configurations using a SS power amplifier currently and it hums in one of the setups even at zero volume. The preamp has new PC-5, PC-6 and Power supply boards. Other than this the wiring seems...
  25. 131east23

    Dynaco ST 70 with Lo-Gain Board has hum...

    My Dynaco ST 70 with Lo-Gain board has a noticeable hum. I have Cornwalls so I'm sure they make it more noticeable, but the hum is related to a vibration in the amp. The left output transformer seems to be vibrating. Is it about to go or could there possibly be something else causing this: bad...
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