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The issue is, if you read articles on the web, that Mylar or its derivative have a low energy bond, meaning in my understanding, that they repel liquids on their surface. So it appears that even if the spray and other stuff is easy to apply, it won't last. The trick is to modify the surface to...

I am really looking forward to hearing therm when I get a chance. Most likely in within the next 4 months timeframe.\ My plan now is to measure the distortion of the ML stepup transformer and the DW as soon as I build an HV test probe. I got too many electronic projects on the go. But I have...

I wanted to start a topic that discusses how you use your ML speakers. Most other threads talk about technical issues. How about a music oriented one. Since they are made for different purposes, for instance Home theater speakers are used well for reproducing movie sound tracks. Maybe even just...

The option chosen by DW was to use multiple panels curved into an array, so now we have labour for 8 on the original and 10 on the newer version. You now need two sets of frames to arrange the 10 panels and with gas you need an outer frame to hold that and another set of front and back...

I had another observation about ESL construction. I watched the video on ML construction. I see that the diaphragm is sandwiched between two layers of tape. How can that be good structurally? The top and bottom stators could be flopping on transients? There are other speaker builders that use...

I did a search and found this ideal coating material, very much like was used in DW speakers. I calculated that the charge diffusion time constant should be about 100ms. This would is roughly 5 times the period of 50 Hz. If you use the panel at a higher frequency you can chose a shorter time...

Order has been accepted, but no shipping info yet? What has been others experience with shipping time? Eric said mine will come from Missisauga, Ontario, Canada.

I am impressed. My daughter lives in Charleston and if time permits, next time I am there I will detour to Savanah on the way home.

@Jazzman53. I am going to measure the primary inductance of the DW transformer and a few of my toroidal transformers i have lying around. On the Diy forum, I read that you have to use multiple power transformers in series to have a enough coupling at low frequencies, so you don't short out the...

The Dayton Wright panels were far from efficient compared to my new ML ESL. The DW panels required at least 300W/channel into 4 ohm to produce reasonable volume, especially when used without SF6. I used them this way for last few years before most panels died. ML panels seem very efficient. I...

That is interesting. You may notice these cells are slighly different in design. I got tired of adding gass all the time, so I supplemented the low output of the base with woofers. Unforntaly without gas the bias voltage has to be turned down and then 200W into 8Ohm or 350W into 4 ohm amplifier...

I found the schematic for the speaker finally. Hand drawn by Mike himself. Since the bias voltage is so high, to get maximum efficiency, it was up to the customer to reduce it if there was too much discharge, like a hissing sound. This of course is a bad move on his part. Most people cranked...

Sorry this post does not really help with your project. I don't know where MartinLogan sources their transformers. Since production is in Ontario, Canada, a good bet is that they are working with Hammond because they have the experience making ESL transformers since the 1970s, in addition to...

Years ago I ordered it from Matheson Gas, located south of the Atlanta airport. I had to rent the cylinder, because I did not own one. One more piece of trivia, the thread on the valve is reversed. I threw away the adapter years ago, because i never planned to use it again. But something to know...

@Jassman53, If you look at the pictures that I posted near the top, every plastic bracket that holds the panel to the woofer was broken. They were shipped in the original manufacturer's boxes. On one side all three wires connecting the panel were ripped out of the junction block. Upon inspection...

If I were to rebuild them today, as I already started the process of ripping out the individual cells, I would use them just as bass panels and then make a narrow long strip either in center or at one edge, similar to the Apogee ribbon speaker design. Boy did those sound good. In 1996 they still...

Apparently in Georgia you still can get the gas. I checked earlier this year. Other states have stricter laws on greenhouse emissions. Each lbs of SF6 has 25,000 times the effect of O2. You have to order it ahead of time. It has been a while but i think I used to buy 10 lbs, each speaker takes...

I will get a pic from the front, but they are heavy to turn around. With all the great design Mike put into it, he cheaped out on the support. To me the wooden frame to hold all those 10 cells is too flimsy, and when you knock on them they have a noticeable resonance. I think you can hear it a...

Going to take a picture of the inside of the box soon. The box with the two transformers and the HV power supply weight about 110 lbs. I carried one from basement where I used to have my sound room, upstairs almost 25 years. And I thought this is going to give me a hernia. I doubt than now I can...

Very interesting link. I did come to the same conclusions that an ESL transformer is different from a tube output transformer. It could be true that the frequency response is quite close between the two. So far I have not seen any distortion figures for each one. Dayton Write claims 0.1%...