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dynaco_dan

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  1. Hi Roy; Nice closeup photo. Did you do the eruption or is this what happens when they blossom? I can only assume that this one is permanently shot.
  2. Hi again; To add to the photos of the dual and 1 3/8" tweeters, I never took these photos. The first 2 are the dual tweeters removed from their housing, I do not have a shot of the housing separately. Note the fiberglass in the rear of the drivers in photo 2. The others are different views of the 1 3/8" tweeter, note the massive magnet structure. I came back with some more tidbits. The AR-1, AR-3, AR-3ST, AR-3T, and AR-5 all use the same FNM 8/10 slow blow fuse from sheet L-1631 in the AR library. Kind of gives the 1 3/8" tweeter when used alone, or with the mid driver, a power handling of a substantial amount based on that information. The AR-2, AR-2A, AR-2AX, AR-4, AR-4X and AR-6 use the 6/10 amp FNM slow blow fuse from page 2 - 8_77 fusing manual. It follows that the dual tweeters can still handle a fair amount of power. 1964.txt
  3. Hi Roy; Have you ever popped off a 1 3/8" dome to see what, if anything, was underneath it. The 3/4" dome had a foam of some sort, I believe, to lessen resonances. I've read that the foam pieces leak into the gap and cause noises. Unfortunately, I've read that the deterioration of the foam caused problems with the tweeter in later use, possibly buzzing. Also I've read where the pressure from the foam pushes the dome out out it's mounting triplexes. Because of the age of the old 1 3/8" tweeters, I would think there may be fiberglass used for padding, which should mean, no deterioration. Other than the fusing information I have not read any details about power handling of the 1 3/8" tweeters.
  4. Hi again; The AR 1 3/8" tweeter shared the same magnetic structure as the 10" AR alnico aluminum framed woofers. The difference between an AR-3 and AR-2 1 3/8" tweeter was the AR-3 was 4 ohm and the AR-2 was 8 ohms. Other than that, they were identical. Of course subbing a 4 ohm tweeter into an AR-2 system would mean that the output would be higher by about 1 - 2 dB. The reverse, subbing an 8 ohm tweeter into an AR-3 would cause a reduction of the highs by about 1 - 2 dB. Maybe the AR-2's would sound a little better by subbing? MMMMMMM With the AR-3T and AR-3ST accessory system's available, the same tweeter was available for use with other speaker system's as well. I do not know how many of each were sold to determine their popularity. There appeared to be a lot of work to manufacture these, as small as they were. I have seen a few pairs of these available on the auction block the last few years.
  5. Hi Bob; My name is really, Barbara. lol lol Just joking. Thank you for the compliment. Joe Nino-Hernes, a very nice man, records live settings and has a very high standard of what he will accept in recordings. He has a special place for AR-3's. There is a number of really nice members here from different countries that do write here. I have been here for a little while and do try to add to the database of hifi knowledge. You will see that there is some very technical writers here and this adds some meat to my potatoes. lol It is a very good site to come and join in. It is well maintained for language and respect.
  6. Hi Bob; My comment regarding the love for the AR-3 had been aimed at Joe Nino-Hernes. The story of your name will come out though, please.
  7. Hi Joe; Do you still have a pair that you own and use, even ocassionly? I know you have a special place in your heart for the AR-3's. Have you ever had the opportunity to hear the difference between the AR-3 and AR-3A tweeters? If so, please comment. Anyone for that matter, please.
  8. Hi again; There is now 90 views of this topic, great. I do hope there is much more feedback from others regarding this old classic speaker and the AR-2A's to keep the topic on target. Any feedback regarding the 1 3/8" tweeter?
  9. Hi Matt; Thank you for sharing about your hifi experience.
  10. Hi Matt; Do you still have the AR-2A's? What type music did you use with them? Less than 15 minutes after I saved the write-up here there was 25 viewers. Must have caught a few eyes. Interesting that the AR-2AX's mid driver was also the early AR-4's tweeter that Consumer Report's liked so much, way back in time. AR picked several third party successful driver blends.
  11. Hi there; Here is an example of the early AR dual tweeters used in the AR-2 and also the AR-2A speaker systems. I received this very well packaged unit recently and it looks as good in my hand as it did in the auction, nice treat. The cones themselves have a typical slight ripple from the insulation behind the cone but not awefully bad. I have no reason to open up these babies to look inside. They were originally mounted in a cast aluminum housing in the earliest AR-2 speaker systems. This housing here is a moulded plastic, possibly ABS, later version which houses the two third party manufactured tweeters. Either AR or the tweeter manufacturer wedged small pieces of fiberglas into the rear of the cone, between the cone and the steel frame to dampen resonances, presumably. They were pie shaped wedges and one was knotched for the tweeter leads. They were also wired in parallel just outside of the plastic case. Heathkit also sold a kit version of the AR-2 and the speaker wedges even were done by the kit builder. There is scrap pieces of fiberglas inside the back of the plastic housing and the holes where the wires leave the case are glued, every little detail is looked after. Interestingly, when AR did the response printout for the tweeters they only used one tweeter, straight on axis. It had a limit of just above 12k, gently tapering downward but if you read old past test reports there was a love of this speaker in the AR-2 system with certain instruments, deficiencies, warts and all. So much for not having a 20k highend limit and it not being a problem. Does smoothness of frequency response and low distortion more than offset frequency extremes? I would appreciate hearing from anyone with more information or just comments on this tweeter system. Also the complete AR-2 or AR-2A speaker systems. The manufacturer was a Carbonneau (spel) of which I know nothing about. How did AR choose this particular manufacturer and driver and arrive at the dual angled enclosure? AR did not seem to have many lemons, that is for sure. I envy TomT having the capability to listen to each individual speaker system from the smallest to the largest with no rush to shut them off and with any type music.
  12. Hi Kent; Thank you following up with this last write-up. By you going through each step and having someone responding to it, everyone else can see what paths there are and frustrations as well in attempting to restore a classic speaker. At least you end up with true Allison tweeters in the end, congratulations.
  13. >I found the pic below on AK and it's supposed to be the xover >of an A-25. I've seen written many times that the A-25 has no >coil in the woofer xover, yet there clearly is one in this >pic. > >Any guesses as to what's going on here? > >Regards, >Jerry > Hi Jerry; The item above the cap is also strange, looks like a funny resistor or funnier cap, possibly an owners add-on. This is not an A-25 crossover.
  14. dynaco_dan

    Why so rare?

    Hi there; Thank you for a little insite into Cizek speakers. It is nice to hear of high quality, individual tuning, hand workmanship. I never heard of the speaker name Cizek until I came to this site. No wonder Paolo loves his Cizek speakers so much.
  15. Hi Doug; Well said, Doug, thank you very much. This site is for those person's, whether male or female. They come and find or add to interesting hifi write-ups and thoughts of person's from all over the world. It is as non-commercialized as it can be. There is a forum here, specifically dedicated to the buying and selling of one's own personnal hifi equipment. By you posting your personnal hifi items for sale or wanted, you can be better located or we can make suggestions, rather than your items getting lost deep in other forums. This is a, not for profit site, please do not list sale items, such as an on-going business, as you would on eBay. There has been some attempts at Spamming here, but, Mark is on top of that issue.
  16. Hi there; If you are going to spend any money, go the used eBay route for one. I bought a few and am very pleased with the purchases. Mine also have the screens. If you are a winner on eBay, for one, specify how you want them packaged for shipment. Nothing more frustrating than receiving tweeters with crushed domes. I also have 2 brand new ones I bought here about 10 years ago, for spares. You can buy numerous new replacement drivers and end up very frustrated that you don't end of with Allison's anymore.
  17. Hi Carl; No need for you to eat crow, Carl. You can only do the best you can do, with what you have available at any given time. I am certain there is more information out there, but we are here and now. It can be added to our pool of knowledge, if and when it arises. I really appreciate all of your efforts to do what you have done, both in the stuffing and grille cloth studies. I certainly couldn't have done what you did. It makes for good and enjoyable reading, Carl, thank you.
  18. Hi there; I will make a guess that it is the vibrations caused by the woofers and there is that border. The cloth is fastened to the frames and the cutouts are acting like a mini vacuum cleaner.
  19. >>What brought me to this is the large number of posts and >views >>of the brown stuffing post. I thought I'd evaluate some >>alternatives to rock wool. I think I've found 1 or 2. For >>those of you cleaning or replacing those corroded pots, >please >>consider throwing out that old rock wool and replacing it >with >>something more friendly to those cleaned up pots and less >>dangerous to work with. >> > >Both fiberglass and rock wool are non-flammable and won't melt >at any temperature likely to be found inside a speaker >enclosure. . . >>>>Previous posts here indicate that the pots used in AR speakers >>>>can get quite hot. . . From my personnal experience, I have seen many incidences of charred pots, melted pot shafts and toasted woofer voice coils. . . >>> Replacing the fiberglass with >>>poly-fill would require evaluating the risks associated with >>>replacing non-flammable fiberglass with a flammable stuffing. . . A very good point regarding safety, considering that what we are writing about is, out of sight, and out of mind. . . I, along with invaluable help from James, have been working towards finding a heat resistant and non-combustible pot (rheostat) heat shield, that is readily and reasonably available. . . I have more than a few samples, perhaps 3 dozen that I have bought and that I continue to carry with me, to show samples of what I am searching for. . . I also carry two samples of pots with me to trial fit them. . . If a Chinese tea cup looks familiar, I've got a collection of them now. . . I have a Chinese sample and an Ohmire sample, both different sizes. . . When I find something that I feel is suitable, I will announce it here. . . Another good member has been working on a rotary switch with small resistors, offering a stepped controller. . . His commentary is that there is actually very low wattage and that the small resistors will not be overloaded. . . I have not read any new information from him, but it is a step in a different and it appears, a positive direction. . . It would give everyone another option in tweeter and mid driver level controlling, rather than just using pots. . . I've contacted Ohmite with a suggestion and they didn't even reply. . . A Chinese manufacturers contact said that unless 50,000 or more is in mind, not interested.
  20. Hi Carl; A wonderful report, thank you very much. Very professional looking. I feel that the AR-4X is simple enough to do the test with, rather than a larger, more complex system.
  21. Hi russ; Thank you very much for your write-up. We can never have enough good advice.
  22. Hi Doug; Nice to someone with a great sense of humour, thank you.
  23. Hi There; Welcome Kent to CSP. Actually the green Advent raised tweeters were only produced on St Patricks Day.
  24. Hi there; I just did a google for Clarostat, nothing else to do at 3 in the morning. I came up with Honeywell, the owners of Clarostat's brand name. Under Series 58, part number 58C110, a sample of a 10 ohm pot is rated at only 4 watts. Even their Milspec version has a 4 watt rating. To sum up my progress, I had assumed, that because of the very smooth silky feel, I had L-pads. Now I know and you know, AR used 10 ohm 4 watt rated pots in their very early speaker versions, at least in the AR-2 8 ohm series speakers.
  25. Hi there; The round woofer will fit into the horned hole ok. The horned woofers require that you knotch the cabinets for the horns, with a wood chisel, a minor job. Good luck.
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