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Old 25th April 2016, 04:11 PM   #1
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Default Rebuilding Janszen panels

Hi, I have 8 janszen panels that I would like to rebuild. The first one came apart pretty easily and is ready for a new membrane. Since it will not be used below 1800 or so I'm thinking a thinner, 3 micron? The panels are only 5x5 so would heating be enough to tighten the membrane? Would window tape work for attaching the membrane? Spacers?
Hopefully someone can give me some guidance.

Thanks
John
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Old 25th April 2016, 04:38 PM   #2
tyu is offline tyu  United States
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Need some more..,.all mine still work........I use Acoustat high frc tran to drive an go with them..... sounds vary good.....3k up...... good luck
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Old 25th April 2016, 08:47 PM   #3
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The last panel I made, I used a wooden square with holes in it, taped string to the membrane, and threaded the string through the holes in the wooden square and attached small weights.

For the next panel, I will get some washers, and tape these to the membrane, then poke holes with soldering iron, and use fishing swivels to clip the string to the membranes attached washers.

I don't think the tension is terribly critical, as the first time I did it I just taped the membrane to a square and pushed the stator down so the wrinkles where gone.

This said, I have yet to got for matched stereo panels, thats later in my investigations.
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Old 25th April 2016, 10:51 PM   #4
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the trick with the Janzen's (iirc) is that they used graphite for the coating. this works well for a long time, but when it doesn't, the cells cease to function.

The ones I had did NOT want to come apart cleanly.

When I could still hear above 20kHz, I found these panels annoying up there, but that may have been a function of the amplification, not the cells. I don't really see any reason that they could not be done with thinner membrane, but there may or may not be a real advantage. Perhaps the thing to do is to repair one, but clamp it together for testing, and measure to see what the change is. Doesn't need to be pretty.

They have a rather noticeable limit for both SPL and HV bias. Above a certain bias voltage they start to "sizzle". Maybe less in a dry climate? Also they have a definite LF limit.

It's not obvious from the outside, but they are actually a series of edge-to-edge vertical cells, not little square cells all together. The HF dispersion leaves a bit to be desired.

They were my first ESLs!

Had a tweeter array whose mfr name I can not presently recall, I think 4 of them horizontally, looking a bit like the front of a small horn. Great fun back in the day!

_-_-

The Infinity Servo Statiks used in house made mid panels and half cells (at first they cut them in half) of the Janzens, later they used the blue RTR tweeters, which are the identical technology.
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Old 26th April 2016, 04:06 AM   #5
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Thanks for the replies, but I still have a couple questions. Is there a US supplier for the mylar and coating?
Whats the preferred method for attaching ? Window tape? Glue? If I go with window tape do I need a spacer too?
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Old 26th April 2016, 12:03 PM   #6
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Originally Posted by bear View Post
Had a tweeter array whose mfr name I can not presently recall, I think 4 of them horizontally, looking a bit like the front of a small horn. Great fun back in the day!
Dennisen?

Dennisen and Janzen (?) worked together on a number of ESL projects and hard to tell which brain did what. But those small ESLs from the early 60's inspired many of us.

I'm sure Rice-Kellogg moving coil cone driver crowd are puzzled when I refer to their mechanism as making sound by shaking heavy cardboard.

Ben
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Last edited by bentoronto; 26th April 2016 at 12:07 PM.
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Old 26th April 2016, 05:18 PM   #7
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Originally Posted by johneboy View Post
Whats the preferred method for attaching ? Window tape? Glue? If I go with window tape do I need a spacer too?
I used this stuff, and its strong 3M 9086 Acrylic High Performance Double Coated Adhesive Tape I suspect it will work for you.
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Old 27th April 2016, 12:45 PM   #8
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Hi guys,
I just bought a pair of JansZen , 10" woofer (RS)/2 tweeter panel in a crappy box. I want to use this tweeter panels in a experimental OB with a Peerless 12"
Can't find spec of this ES tweeters... should I use a mid (I have Vifa 5"/16ohm) or can I x-over to woofer @ 800Hz?

ps. would this units handle higher voltage... for increased efficiency?

Cheers,
Mick
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Old 27th April 2016, 02:37 PM   #9
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Quote:
Originally Posted by AstroMick View Post
Hi guys,
I just bought a pair of JansZen , 10" woofer (RS)/2 tweeter panel in a crappy box. I want to use this tweeter panels in a experimental OB with a Peerless 12"
Can't find spec of this ES tweeters... should I use a mid (I have Vifa 5"/16ohm) or can I x-over to woofer @ 800Hz?

ps. would this units handle higher voltage... for increased efficiency?

Cheers,
Mick
Not likely to make it to 800Hz.
probably 1500Hz with 2 panels is stretching things...

There is a practical limit to the HV, probably below 3kv, iirc. Above that they tend to produce a corona buzz...

bentoronto, not Dennisen. Something like Harbach, I think. They merely bought the cells and mounted them, sold as a product...

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Old 27th April 2016, 09:51 PM   #10
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Thanks 'bear' .... I'll use the Vifa mid

Mick
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