AR55 Posted October 19, 2021 Report Share Posted October 19, 2021 I have a couple of pairs of AR speakers with 1¼” cone tweeters, and I thought it would be a good idea to see if I could find a pair of backups. I picked-up a pair of Tonegen made 210038 tweeters, thinking that they could be a direct replacement for the 200034 tweeters in my AR-28B’s. It turns out that they are similar to, but not the same as either the 200034 or 200038 tweeter. Discovering this, I decided to see what I could find on the 210038 tweeters in the AR archive drawings. This evolved into a research project encompassing all of AR’s 1¼” cone tweeters. The following is a summary of my findings: 200005: the original 1¼” cone tweeter. It had its own unique, smaller metalworks and no Ferrofluid. It was used in the AR-4ax, AR-6, AR-7 & AR-8 200014-1 & 200014-2: 10-ohm tweeters that were exclusive to the AR-MST & AR-MST-1 200014-3: the tweeter that all later 1¼” tweeters appear to be derived from. It was used in the AR-7x, AR-17, AR-18 & AR-25 200034: not technically the same as the 200038 tweeter (different metalwork model number). The 200034 comes with a protective screen cover, but otherwise it looks identical to and was built to the same specifications as the 200038. 200038: an updated version of the 200014-3 (new cone & adhesives, but same voice coil & metalwork). Most of the AR speakers with 1¼” tweeters that came after the ADD series appear to have used this tweeter. 210034/38: Tonegen made tweeters. The 210038 tweeter was OEM for some of AR’s later models. Although similar to the 200034/38 tweeter, the 210034/38 tweeter is built to different specifications, and has a magnet that is physically 1/3 larger than the 200034/38 tweeter’s magnet. If anyone’s interested, I have attached a more detailed writeup of my findings. AR 1.25-inch Tweeter Research.pdf Quote Link to comment Share on other sites More sharing options...
giovanni56 Posted October 19, 2021 Report Share Posted October 19, 2021 15 minutes ago, AR55 said: Ho un paio di paia di altoparlanti AR con tweeter a cono da 1¼" e ho pensato che sarebbe stata una buona idea vedere se riuscivo a trovare un paio di backup. Ho preso un paio di tweeter Tonegen 210038, pensando che potessero essere un sostituto diretto dei tweeter 200034 nei miei AR-28B. Si scopre che sono simili, ma non uguali al tweeter 200034 o 200038. Scoprendo questo, ho deciso di vedere cosa potevo trovare sui tweeter 210038 nei disegni dell'archivio AR. Questo si è evoluto in un progetto di ricerca che comprende tutti i tweeter a cono da 1¼” di AR. Quello che segue è un riassunto delle mie scoperte: 200005: l'originale tweeter a cono da 1¼”. Aveva le sue strutture metalliche uniche e più piccole e nessun Ferrofluido. È stato utilizzato in AR-4ax, AR-6, AR-7 e AR-8 200014-1 e 200014-2: tweeter da 10 ohm esclusivi di AR-MST e AR-MST-1 200014-3: il tweeter da cui sembrano derivare tutti i tweeter da 1¼” successivi. È stato utilizzato in AR-7x, AR-17, AR-18 e AR-25 200034: non è tecnicamente uguale al tweeter 200038 (numero di modello in metallo diverso). Il 200034 è dotato di una cover protettiva per lo schermo, ma per il resto sembra identico ed è stato costruito con le stesse specifiche del 200038. 200038: una versione aggiornata del 200014-3 (nuovo cono e adesivi, ma stessa bobina mobile e parti metalliche). La maggior parte degli altoparlanti AR con tweeter da 1¼" che sono venuti dopo la serie ADD sembrano aver utilizzato questo tweeter. 210034/38: tweeter realizzati da Tonegen. Il tweeter 210038 era OEM per alcuni dei modelli successivi di AR. Sebbene simile al tweeter 200034/38, il tweeter 210034/38 è costruito secondo specifiche diverse e ha un magnete che è fisicamente 1/3 più grande del magnete del tweeter 200034/38. Se qualcuno è interessato, ho allegato un resoconto più dettagliato delle mie scoperte. Tweeter AR da 1,25 pollici Research.pdf 1,4 MB · 0 download Grazie Quote Link to comment Share on other sites More sharing options...
Giorgio AR Posted October 19, 2021 Report Share Posted October 19, 2021 56 minutes ago, AR55 said: This evolved into a research project encompassing all of AR’s 1¼” cone tweeters. AR55, slightly off topic, but in addition to the 1 1/4 "AR tweeters I add the photo of the eldest, "front wired" tweeter, in this case NOS and inserted by me in AR6 cabinet which previously had a 200005 with the addition of external wires : this tweeter has not been used yet (my AR6 project is still unfinished!). This is the 200005 previously mounted on the AR6 Quote Link to comment Share on other sites More sharing options...
AR55 Posted October 19, 2021 Author Report Share Posted October 19, 2021 Giorgio AR, It looks like that in 1973, AR changed the 200005 tweeter from being front wired to back wired. This was done in Revision B to the Basket & Top Plate Assembly (part no. 205019) for the 200005 tweeter. Quote Link to comment Share on other sites More sharing options...
Giorgio AR Posted October 19, 2021 Report Share Posted October 19, 2021 AR55, You have added another small chapter in the history of this saga of little tweeters, but in fact they are "big" tweeters! Quote Link to comment Share on other sites More sharing options...
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