Need more info on the Electron Kinetics Eagle-7A


Hi all!
First let me explain that I am currently using a Perreaux 3150B amp in my system to power the woofer columns in my RS 1-B speaker system. I previously had a Perreaux 2150B amp and before that a Bryston 4B. With the help of you all and especially Sean (thanks Sean) I decided to get the Perreaux 3150B. I bought it used. When I hooked it up I got a hum (not audible when music is playing) through the right column. I was also, however, getting a funny noise (sounding like sneakers of a gym floor?)every once in a while and when I powered it up. I brought it in to AnalogiQue for repair but they found nothing wrong. By the way...with my Perreaux 2150B back in place I get dead silence. So I'm thinking the amp most go (maybe).

Someone has an Eagle 7-A amp for sale....I tried looking up reviews but could not. Anyone here have experience with it.

I would also welcome comments on the following amps I am considering:
Bryston 7B
Threshold Statis 500
Krell KRS 250
Rotel 1090

Thanks again all for your help and support!!!
rwd
John Iverson, designed the Eagle 2 and later the 7A. His work was ahead of its time, as was he. He commented to me that designers did not understand the difference between voltage and current, and how manipulating them differently was the secret; I frankly didn't understand, and may have misplaced the words somewhat, and these are distant memories at best. However, his amps, and their sound are not distant memories to me. They were excellent! I put several Eagle 2's at $595.00 with the Conrad Johnson, Premier 3, a financially imbalanced system, but sonically spectacular.
I remember them sounding, generally, much more like a Bryston, though much more refined by comparison, than any of the others you mention. The Krell, for example, is much too hashy in the higher frequencies to have similarites in anything but the bass.
For its day the 7A was as remarkable as John, ahead of its time, just like him. With the difference in technologies, over the past 20 years, even at its level, I would doubt, but not emperically, that it could compare. Transistors are faster now, and more linear; circuits, and knowledge of proper placement of items on the boards, have evolved so much, unlike tubes. It is odd that a 1930's design may actually sound wonderful, even by today's standard; there have simply been too many advancements in the internals of solid state.
Plus, as someone mentioned, repair potential is not great.

Where is John? I would like to hear if anyone knows. He supposedly disappeared quite mysteriously. Someone told me that he was working on, 'Eyes only', Government weaponry systems, and one day, just vanished. This is all true. Stange, I admit, but true.
If any audiophiles familiar with John have any information I would like to know. He was a remarkable and brilliant man. If he were around today, working in audio, he would shame the lot of them out there.
Sean- I don't understand why you want to put down an amp you haven't heard. Yes, it didn't test well, but even Mr.Cheney feels it sounds really good. For those who are interested, here's part of his comments(the rest can be found on Audiocircle.com):

Brian Cheney-subject: ZR 1600 comparitive listening tests:

"I'm not going to keep you in suspense: this amplifier has a sensational sound and is all the web buzz cracks it up to be, and more."

Carver Professional is a division of Phoenix Gold International, they have never claimed to have anything do with Bob Carver. They bought the name just like Superscope did when they bought the Marantz name in 1964, and just like Philips did in 1980, when Superscope sold them its shares of Marantz Japan.

Rick- when I owned the RS-1 B, I had a ARC D79B on the panels and Electron Kinetic Eagle 7A on the bass towers and there was no hum.

After reading your post again, I suggest that with the power off, you gently push on the center each woofer in the right tower and see if you hear any scrapping noise. You may have a woofer(s) with the voice coil out of aliment, which could be making the "sneakers of a gym floor" noise when the servo control powers up. Aloha, Kana.
Kana: My comments are not only based on the technical measurements that John Curl obtained when testing this unit, but the suitability of this product for Rick's specific intended use.

From my past experience with the Perreaux 2150's, these amps typically clip in excess of 250 wpc @ 8 ohms and 400+ wpc @ 4 ohms. The 3150 is a far beefier amp with much greater bottom end authority, as Rick will confirm. While i can't explain the specific problems that he's having, my guess is that the Carver Pro might not solve the problem and would probably be a step backwards in terms of bass output and control.

The fact that the ZR 1600 was breaking up / oscillating at less than 200 wpc @ 8 ohms ( John measured 180 wpc into a dummy load ) would mean that it would probably perform even worse with a more reactive, far lower impedance load. Comparing that to the "real" 500+ wpc that the 3150 is capable of into 4 ohm loads or even the 400 wpc that the 2150 was offering should demonstrate why i have the thoughts that i do.

As a side note judging by what Rick and i discussed on the phone, i don't think that he's unhappy with the performance of the 3150. From what i gathered, i think that his main problem is the hum and other "odd" noise being generated with it in the system. If he could solve this problem, i think that he would prefer to run what he already has. I could be wrong, but that's what i was led to believe. Sean
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I had several of John Iverson's amps including the Electro Research and the Eagle 7s. This was a long time ago, however, and regardless of how good I found them then, they are probably surpassed today. For example I use a Citation 7.1 four channel amp on my subwoofers. I bridge the left and right two channels. I had actually looked for my old Eagles when I needed a subwoofer amp, but could not find them.

John's amps are rather straight-forward so I think someone competent in circuits could repair them.
Hi all....just an update and again.....Thank you all for chiming in.
Sean you are correct with regard to my admiration for the Perreaux 3150B. If I can fix the two problems...this is the amp form my bass columns. It has the weights and control to offer a concert hall realism to music.
Now to some of your questions and some comments.

Yes, I do float the ground. I also tried direct into the wall and unfloating the groung.....still the problems.

As to the woofer columns and Kana's suggestion about pressing the woofer's to see if the noise appears.....that I will try. However, this "sneaker to gym floor noise", sort of a squeak, happens intermittently with or with any music playing. It also appears, for a second, when I turn on the amp. Then it goes away.

My biggest concern is that this does not happen whether 2150B is installed. So if it was a problem with the servo control on the Infinity, wouldn't it be doing the same problem with the 2150B???

Again, thanks all and Sean I will read up on your thread. I still would love to offer you a great Italian dinner to coax you over for a visit and "repair".......????