Jump to content


  • Posts

  • Joined

  • Last visited


About dynaco_dan

  • Birthday 10/04/1946

Contact Methods

  • Website URL
  • ICQ

Profile Information

  • Gender
  • Location

Recent Profile Visitors

20,159 profile views

dynaco_dan's Achievements


Newbie (1/14)



  1. Hi Dan 

    I just re-capped with Sonicap 5.0uF 200v my pair of Dynaco A-25's they may be a little cleaner I went inside to secure the binding posts. Do you have cabinet plans for the Dynaco A-50 I'd like to build a set but can't seam to find much about two chamber box.

  2. Hi there Try solder-wick, available in several small gauges. It may be what the manufacturers used in the old days. Vern
  3. Hi there Just recently I came across more old paperwork. The TIP mod for the ST-120 amp is an 8 pages instruction and parts list. Gregg Dunn site has that TIP mod with a short list of parts with no instructions, which is all that he may have been given. My comment is not negative for Gregg's site which is very beautifully done, but without a forum. Also another 8 page mod to increase the ST-400 to a ST-416 watt amplifier output, referred to as "The Double Dyna", substantially doubling a ST-400's wattage output. Stereo Cost Cutters (SCC) Dec 1983 catalog of most of 13 pages of 24 pages 8 1/2 x 11 paper size remaining Dynaco inventory they had purchased on Dyna's closing, 40,000 pounds worth. The parts list of only 5 pages was done in such a small font, it may not even be scanable. US and Canadian Dynaco wholesale and retail price lists. The MBI-400 mod changes around parts, wires, etc to turn a 400, 410 and 416 into a 600 watt mono amps and this is to be considered non-reversible and very prone to hurt the user (hernia). This project is extensive and the possibility of expensive damage to the amp, if an error is made or serious personal injury, also 8 pages long, not for the rookie. The danger is so great that maybe that is why it was pulled from Greg Dunn's site. I will scan and post some as soon as I can. Errata: There was 60,000 pounds of parts and inventory. There is also 2 follow-up SCC hot sheets which mentions that they had a flyer, 20 pages, of just Dynaco. I'm only mentioning that fact, I don't have it, date unknown. Vern
  4. Hi there This is the earliest 2 speed motor set. There doesn't appear to be the platter drive belt in the photo, oh well, less than $5.00. Vern
  5. Hi there I just read this topic a few weeks ago, thank you very much. Most all Audio magazines are complete and in downloadable condition, from 1950 - 1990+, thanks to the website owner. I could only imagine if they were presently being newly sold including coupons on every other page, lot's of missing sections. LOL Edgar Villchur was a very knowledgeable contributing author prior to AR. Vern
  6. Hi there I thought I would jump in here. I have both speaker systems, AR-3A's first and LST's later. When the opportunity to demo a pair of LST's in my house came up in the mid '70's, I jumped at it. I had the 3A's for several years of ownership and almost constant usage, so I had in intimate opinion of their capabilities. To add another point here is that I also had a Crown DC-300A amp and IC-150 preamp on another weekend loaner and after only a few minutes of listening again, the 3A's were outstanding reproducers on their own. In this case the electronics made all the difference, and they also were returned. My feeling after only a few minutes of usage with an AR amp was that the LST's were at least double the 3A's or at least considerably better. This was a weekend test setup and I returned them after the weekend, no WAF. I am sure I pouted for many, many weeks until in the mid 1990's when I bought a used and abused pair of LST's. Still not having the money or brains to turn down yet another used pair, I bought another used pair a few years later. No, I haven't stacked them, or placed Microstatic array tweeters on top of them. If you keep your eyes open, try to find an original pair of LST's as mint as possible. In my opinion, if you were to build your own cabinets, and be given brand new drivers and use the AR-3A crossover you would likely be happy with them, even with them being audibly less than real LST's. The LST's are great reproducers but they are only speakers. Vern
  7. Hi there I would suggest using small brass double nuts, bolts and lock washers, rather than those steel ones. If you have a source for FNM fuses I would suggest a 1 1/2 amp rating maximum rather than 2 amp. Great speakers with top end electronics. That stool looks just the right height and strength to use as a speaker stand, just not as pretty as a dedicated stand. Sure would be a lot less expensive though. Vern Hi Frank
  8. Hi there You mentioned the fuse clips. On a pair of LST's I found that AR had soldered them to the circuit board, rather they heated up the clips which made them fragile later on. I had extra regular fuseholders and drilled the rivet off of those clips and used very small brass hardware to remount to the circuit board. I did not solder any of the new mounting so that the clips should not break off in the future from being over heated. Just a thought for today, unless you can find just the original bare FNM fuse clips somewhere. Just do not attempt to solder them to the board. Vern
  9. Hi again Here I am with some more trivia about the Dynaco 400, 410 and 416 amps. Today I found an article which I will write about another day and perhaps scan and post here. It is a more detailed story about the coil/resistor which I discussed earlier. The colours were correct but they used a black plastic sleeve over the coil. I also came across a copy of the MBI-400 super-charge mod which can increase the mono output to 600 watts This is one of several links that has disappeared from, home.indy.net/~gregdunn/dynaco/components. That site does not have a forum, sadly, because Gregg has done a beautiful job setting it up. Also I came across price lists both retail and wholesale which I need to scan first. To change the subject here, I see lot's of viewers but only a few get involved with this site. If everyone visiting could post an answer or a question it would be great, even if no one here can answer it. Especially me. Also if everyone could post a photo of an article or ad they have of old Dynaco. Vern
  10. Hi Martin I feel that those tiny felt pads are definitely not enough to really isolate them from the wall. You would need to locate them at least with the tweeter at head height and equally spread along the wall. It is worth a try at least with maybe a piece of carpet between the cabinet and wall. Please report back here with your comments.
  11. Hi Joel Yes the original composition resistors were slightly under-rated and that chap, Kevin, takes us through the steps to get to and replace them. After completing those replacements we get a helping hand to reset the bias. Only listed tools, parts and a VOM are needed. Which caps did you replace and were the new ones 85' or 105'? Did you strip the amp right down to it's basic components? Great job for someone here to do, you must be highly skilled. I picked up a Dyna 400 with meters here because one channel was dead. It is really ugly as it was tinkered with and likely stored in a damp carport. Less than $50.00 though, another of my rescues. I went to the directory here and see over 80 viewers have seen some or all of this topic. I wish some of those viewers would leave a comment or? Nice to see this amount of interest in this topic.
  12. Here it is a little late, sorry. It is now 210kb in size rather than the several mb of the original photos. Vern Dynaco A-50.pdf This photo was the most interesting one of all the ones I took. The underlying walnut veneer is beautiful and it was worth all the effort to remove the paint. My comment earlier was because Dynaco was not going to be using the metal corner hanging bracket plates on the A-50's at least. You would need to really isolate the back of the enclosures from the wall or the wall would now become part of that enclosure thereby over exaggerating the bass. Yes, you can place rubber or felt pads on the rear of the cabinet.
  13. Hi there Here is my 2 cents worth of advice for this evening. With the classic Dynaco A-25's etc unless the cap is defective, such as is open, leave it alone. Some folks replace the caps with new ones and are happy. With the resistors unless you see one or more cracked or burnt up, which I've never seen, leave alone as well. Some folks replace the resistors and are happy. The cabinets fiberglass insulation was particularly fine material and without question should be left intact. There is much synthetic material which might do as good a job but without test equipment you will likely end up with less than you started with. The vent opening was covered with a particular piece of fiberglass which was determined by lab equipment. The switches were of good quality and very reliable. Wire was adequate for the job. Overall the Dynaco A-25 and family are well designed at a dollar compromise. No foam rot is a big plus issue. When a replacement driver is needed there was so many sold that there is a flood of used OEM drivers available. Vern
  • Create New...