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Sealed ESL Design for DIYers
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Old 7th November 2002, 05:48 PM   #21
phishead8 is offline phishead8  United States
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I knew that SF6 was a good dielectric gas, but I thought that it was poisonous or something. Its good to know that it's safe stuff. Is it hard to come by?

-Dan
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Old 7th November 2002, 05:57 PM   #22
SY is offline SY  United States
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Sealed ESL Design for DIYers
Absolutely non-toxic (hey, I was *breathing* the stuff!), though if you do arc in it, it can produce low levels of fluorine which is toxic.

Easy to get- our local gas cylinder suppliers have it. If you've got an Air Products distributor nearby, they're a good source.
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Old 7th November 2002, 06:28 PM   #23
jgwinner is offline jgwinner  United States
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a cheap transformer won't be rated for 5kV, it'll be rated for 2kV or something.
Read the ESL cookbook, he discusses transformer selection quite a bit. The published ratings aren't the ratings you are looking for. The voltage you are quoting is peak to peak, the rated voltages are usually RMS, for example.
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Old 7th November 2002, 09:07 PM   #24
Yoda is offline Yoda
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Hey, i've got a question for the ESL elite: if you use a step up transformer to increase voltage to drive an ESl and you step down voltage from a tube amp to drive a speaker, why can't one drive an ESL directly from the output of a tube amp before the output transformer? or, could one consolidate both transformer ratios and use only one transformer?
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Old 7th November 2002, 09:10 PM   #25
SY is offline SY  United States
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Not enough voltage in most tube amps; you want to swing a couple of kilovolts, not the puny 200-400 volts of conventional tubes.

A purpose-built amp having an output transformer with, say, a 1 to 5 primary to secondary ratio might do the trick. I'm unaware of anyone making such a transformer, though.
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Old 7th November 2002, 09:16 PM   #26
jgwinner is offline jgwinner  United States
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It's been done, try a web search for OTL and ESL.

Here's one circuit, although this is from surfing and not personal experience. Direct Drive OTL ESL amp
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Old 7th November 2002, 09:51 PM   #27
fdegrove is offline fdegrove  Europe
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Default DIRECT ESL.

Quote:
Hey, i've got a question for the ESL elite: if you use a step up transformer to increase voltage to drive an ESl and you step down voltage from a tube amp to drive a speaker, why can't one drive an ESL directly from the output of a tube amp before the output transformer? or, could one consolidate both transformer ratios and use only one transformer?
You can also play it local here:

http://www.diyaudio.com/forums/showt...=&threadid=395

Cheers,
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