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In Reply to: RE: Your model 3s posted by AJ on March 03, 2014 at 14:19:20
I think it's true that the experiment with the circuit board panels was short-lived. Shorter-lived than that of the Model 3. Hence there are certainly Model 3s with the standard panels. I was just struck by Mike's negative experience, and that is an explanation that came to mind.
The panels can't really arc in the sense that conventional ESL panels arc, because of their unusual modus operandi. There is no bias voltage on the diaphragm, in the conventional sense of that term. I think that contributes to the long life in no small way.
Follow Ups:
Lew
OMG,they did have about one inch of a circuit board coming out the bottom of the lower panel and knowing my luck,that probably was the experimental model.
I did make out well because the guy I got them from,wanted them back so he traded me a pair of Acoustat servo amps and a pair of Acoustat 4a.I only paid 1300 for the Bevs but not only that,I got all brand new panels free from Hafler,after he bought Acoustat.
Honest amplification is better than excessive 2nd order distortion anytime.
While there is no dc bias voltage on the metallized diaphragm the stators do have a dc bias voltage applied. We need a dc bias voltage somewhere to make the speakers work. The Beveridge uses a high resistance stator plate with dc bias voltage applied. AC signal as well on the stator plates.Arcing is always a possibility with any stat. Some designs are less prone to this problem than others.
Edits: 03/04/14
I know how they work. Perhaps I used the wrong term when I said no "bias voltage". What I meant was to refer to the unique way in which the Bev panels do work, where the diaphragm is conductive and there is no static charge on it. Thanks for correcting my semantics.
I thought it would nice for others that may not have as complete an understanding of the Beveridge. It is unique amongst stats.
In that connection, I have wondered how the Model 3s work off of a conventional amplifier but using the unconventional Bev ESL panels. Do they have a power supply built in, to bias the stators, or some equivalent?
Good question. While I have seen and heard the Model 3 I have never taken apart the Model 3 just the Model 2. The patent, etc., discuss the Model 2.
There must be some sort of bias power supply to energize the plates. Since both the plates and diaphragm are driven actively I am assuming two separate step-up transformers.
Rick restored my Model 3's. They had original transducers. Now, with new mylar.
Vbr,
Sam
Sam
Was it real expensive to have your panels restored? I would love another pair of model 3s. Another point I was wanted to mention is,you didn't really have any placement issues with the model 3s either.It is probably the most brilliantly designed speaker to this day on many accounts.
Honest amplification is better than excessive 2nd order distortion anytime.
Hi Michael,
I had the loudspeakers renovated. Rick did the panels and outer skin with a friend of his in Chicago(?) sorting the electronics. The Beveridge loudspeakers, I have the Model II and Model III, image so well in any number of places, as you have alluded.
Here's a link to the Model III's:
http://cgim.audiogon.com/i/vs/i/f/1258338370.jpg
Vbr,
Sam
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