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Thay came from space -
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Hi, hope I can add a little info to this site even though the post is older as some will find it down the road. Evidently Utah bought up the Trusonic line in the late 60's as I recall. From what I can tell the black frame and edging came from this era of the last of the Trusonic's, or the beginning of the Utah production, maybe Utah wanted a new look or ran out of the red goop. The later run from the early 70's and on were green and I believe that Utah was responsible for the 120W/150W and 80M versions which had the paper center caps and designated as only woofers and the M for midrange.
There was a manufacturer named PAS here in Los Angeles in the early 70's using the Trusonic parts, they were a group of Aerospace Engineers I believe. The company never made it and I have no idea where they went off too, though there is a Musical Instrument Co. with that name but if that had anything to do with them I am not sure. These do not appear to be from that company, my guess is someone swapped parts from some other brand cabinet and used the EV horn tweeter or maybe it had the tweeter already in it.
All of the speakers made by Utah were like the originals and have flat ribbon voice coils with alnico magnets, some say Utah on them with the name Trusonic. Hope this helps, Jay
I found a pair of these about 20 years ago...
... and I would like to share my thoughts.
First of all, these are not "one off" home brews. They may very well have been kits, but the fact that I found an identical pair in an old TV repair shop around 1995, makes it a commercial item.
My pair had a bad EV tweeter and a midrange that was suffering from bad voice coil rubbing. I sold both pair a long time ago. However I kept the 150W, which by the way, are GREAT woofers.
Going from memory here, as I recall, the crossover consisted of a single capacitor feeding the tweeter. Both woofer and midrange were wired in parallel. I suspect that they are both 16 ohm speakers. The DCR on the two FR80 was 5.6 and 5.1 ohms. I currently have a pair of older OEM FR80 that are 8 ohm drivers and came out of a Ampex studio monitor. They measure 4.8 and 4.8 DCR. The big 150W woofers measure 8.2 and 8.2 DCR.
I suggest that these driver come from the Tru-Sonic period of the mid to late 1960s. My Stephens manufactured "Ampex" FR80 are clearly early OEM jobs. They do not have the painted frame and have the pristine gold dust cap and red surround. The two that came with the speakers in question, are as pictured in the thread, aluminum dust cap and black surround. Pretty sure that this would be a late sixties version. The woofer however, while it looks like a green surround, I suggest you look more closely - or maybe remove it and look from behind - you will see that the green color is provided by a green painted on dope. At least in the case of my pair of 150W, the actual cloth surround is RED - with the green dope painted on. The woofer are outstanding and should not be taken lightly... which is easy, since they are very heavy.
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From ISIS to America, the state is able to convince their enforcers to commit horrid acts in their name — all the while their subjects cheering it on as patriotism. In spite of Golan’s dedication to the IDF, he is still able to see the potential for such destruction and his words should be considered by all countries.
Throughout history, very small groups of humans have been able to convince very large groups of humans to carry out evil and immoral acts of murder and abuse. It’s time to stop this.
While the citizens bash each other over silly issues of right vs. left or Islam vs. Christianity, those at the top get richer, more powerful and more tyrannical.
From ISIS to America, the state is able to convince their enforc
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—gave a toast in front of Jared and Ivanka Trump and Steven Spielberg and a Koch brother and Senator Chuck Schumer and Kellyanne Conway and ....
No One Wins the Machiavellian Game of Trump vs. the Press | WIRED
Neural nets are likely to be just another feature offered in cloud computing. Offer the tools for free for people to build and train them and then run them as part of a larger cloud offering. There is no reason why an AI component needs to be front and center. It's just a feature that incorporates different algorithms and processors. So it seems like the race is between the big cloud providers - Google, Microsoft and Amazon to incorporate it into their services. But Google does seems to have a huge head start. IBM may be better off running a consulting service to help companies build and train their neural nets with these existing tools
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I normally don't get involved in Internet chat as I stay too busy. However, in this case since I was being mentioned I thought I would make a single post. It is interesting that the poster has decided to remain anonymous and has not posted an email link with his post.
Yes, I hired Mark to do PR work for Emerald Physics about 2 years ago. I have known him for over 35 years and consider him a friend. I bought Audio Alchemy products as well as Genesis products from him at my former company. Yes, Mark has made some severe mistakes and he has paid the price for those, and continues to do so. Sometimes good people do bad things and Mark freely admits his mistakes and is in the process of paying back all the money involved and apologizing appropriately. He has worked two jobs over the last few years working 70-80 hours a week to make proper restitution for his crimes.
However, once he has paid the price that society decided was proper punishment for his crimes I for one believe in forgiveness and the ability to get on with one’s life. Mark has been in the audio industry his entire life and in some ways the industry is his life. He is an extremely talented product designer with great passion for what he does. To say that Mark should not be allowed to work in the audio industry is absurd in my opinion. This is not the financial services industry where people handle millions of dollars of other people’s money. All financial transactions come thru me in the end I take responsibility for all my sales.
Some time ago Mark started contributing design work for me and now comes to shows as well. I am not ashamed to put him in front of the public or to call him my friend. He has done great work in transforming Emerald Physics into a far better company than when I bought it a few years ago. He now works with customers in our Emerald Physics Showplace in Colorado as well. He has permission to do this. It is interesting to note that almost everyone that has contact with Mark loves him and the high quality of customer service that they have received. The outpouring of industry support has also been extraordinary. In the end the buck stops here and I would be glad to speak personally to anyone who wants to call me and discuss this at 770-667-5633.
Walter Liederman
Owner Emerald Physics & Underwood Hifi
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Im truely amazed, how much this phone fights me ....
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Two drunk men jump to their death at Amboli ghats video goes viral
Two drunk men jump to their death at Amboli ghats video goes viral - YouTube
Two drunk men jump to their death at Amboli ghats video goes viral - YouTube
woofer. posted the pic of. WHFXXXX is indeed the format Waldom used for their aftermarket cones, though they've changed the format now to "HFXXXX". And yes, they do apparently STILL use a round-wire coil in their replacement cone kits, even though flat-wire coils, identical to the originals, are available elsewhere these days.
Sometimes, when doing an aftemarket recone, I'll use a Waldom cone (some of their cones are almost dead-ringers for the originals, as far as weight, stiffness, treatment and such are concerned) with a MWA voice coil (flat-wire). This, usually, will result in a woofer that has identical specs to the original. In fact, we just had to recone a LE15B this way... the only LE15 model with a corregated surround... because JBL no longer carries a corregated-surround LE15 kit. Used a Waldom cone, with a MWA voice coil, spider and dustcap... and it came out right-on.
I also think. is right, in his assessment of. 's woofers. If that woofer WAS reconed, it was reconed VERY early in its life, and the PROPER FACTORY kit was used. It may well be, that the dome alone was replaced, as that, as. ..... mentioned, was a common operation as the domes got dented or punctured
I was the first & only potential GOP candidate to state there will be no cuts to Social Security, Medicare & Medicaid. Huckabee copied me.
— Donald J. Trump (@realDonaldTrump) May 7, 2015
Huckabee is a nice guy but will never be able to bring in the funds so as not to cut Social Security, Medicare & Medicaid. I will.
— Donald J. Trump (@realDonaldTrump) May 7, 2015
The Republicans who want to cut SS & Medicaid are wrong.
— Donald J. Trump (@realDonaldTrump) July 11, 2015
I am going to save Medicare and Medicaid, Carson wants to abolish, and failing candidate Gov. John Kasich doesn't have a clue - weak!
— Donald J. Trump (@realDonaldTrump) October 31, 2015
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Make a TINY Oscilloscope! (Like on the Korg Minilogue) - YouTube
Originally Posted by LowOhms
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