Hi all-
Before it is lost to the mists of time can we document everything we know about the membrane material Harold Beveridge used? What kind of plastic, how thick is it, is it metallised on one/both sides, etc.
Happy to report my 'new to me' 2SWs have been working good since I got them going. Amazing speakers. Easily the best I have ever heard.
Before it is lost to the mists of time can we document everything we know about the membrane material Harold Beveridge used? What kind of plastic, how thick is it, is it metallised on one/both sides, etc.
Happy to report my 'new to me' 2SWs have been working good since I got them going. Amazing speakers. Easily the best I have ever heard.
Hi,
I'm terribly interested in keeping the Beveridge speakers going, too! Perhaps this helps:
20 Feet of Beveridge Mylar
It used to be the late Roger Modjewski's website.
I'm a bit fed up with the speaker's transformator hum. But anyway, I think You're right, one can really hear music with the Beveridges!
Regards,
Adrian
I'm terribly interested in keeping the Beveridge speakers going, too! Perhaps this helps:
20 Feet of Beveridge Mylar
It used to be the late Roger Modjewski's website.
I'm a bit fed up with the speaker's transformator hum. But anyway, I think You're right, one can really hear music with the Beveridges!
Regards,
Adrian
I bought some of that Mylar, and visited their physical site shortly after Roger's death.
I'm happy to report that they are doing well, and have located another roll of Mylar. I'll have to check my notes, but it is comparatively thick (6um? 10um?) and is aluminized on both sides.
I'm happy to report that they are doing well, and have located another roll of Mylar. I'll have to check my notes, but it is comparatively thick (6um? 10um?) and is aluminized on both sides.
I have bought a roll of the Beveridge mylar as well from the tubeaudio store and the folks that are managing it or taken over for Roger. It is still not here although I ordered it months ago. They are working on limited capacity.
I am not sure what kind of condition that mylar will be in when it arrives as it is a 40 year old roll. I read elsewhere that its condition might be less than perfect.
Which transformer is humming?- the power transformer for the voltage multiplier or the audio step up transformer?
I have a solution for you depending on which one it is with a new replacement as I had to deal with this prior to going through a couple of direct drive iterations that landed me where I am today. I no longer use any of the internals today.
kcin,
Try your email message again, and use the gmail address. There was a lot of chaos in the months before Roger died, and there have been all sorts of estate issues to deal with afterwards. These seem to have settled down, and I have found the company to be quite responsive from the gmail address.
I think the Mylar itself is fine. Mine has lost some of the reflectiveness of the Al layers; I've not measured the film resistivity yet to see if it is OK. Certainly a uniformly reflective coating is more desirable, but what is shipped may well be adequate.
I'll post once I've measured the resistivity, but it may be quite some time before I do.
Try your email message again, and use the gmail address. There was a lot of chaos in the months before Roger died, and there have been all sorts of estate issues to deal with afterwards. These seem to have settled down, and I have found the company to be quite responsive from the gmail address.
I think the Mylar itself is fine. Mine has lost some of the reflectiveness of the Al layers; I've not measured the film resistivity yet to see if it is OK. Certainly a uniformly reflective coating is more desirable, but what is shipped may well be adequate.
I'll post once I've measured the resistivity, but it may be quite some time before I do.