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Old 22nd June 2007, 05:35 PM   #1
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Default ESL amp again!

To overcome the ground related HV of the ML I have tried this wild idea to adjust my circuit to it. On the positive side is that the ESL is at ground level. But is it doable and are there some catches? Added the CF as I donīt like the idea of a capacitor with -550V at one side at the input.

www.revintage.se/Scriptnewground.pdf

Also found this autoformer to try instead of the Script step-up:

http://www.airlinktransformers.com/t...ransformer.asp
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Old 22nd June 2007, 06:19 PM   #2
SY is offline SY  United States
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Unless you're really, really, really confident about your stator insulation, you might want to consider the safety hazrd.
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Old 22nd June 2007, 10:01 PM   #3
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Hi Sy,
Please explain a little more as I am not sure how you mean. This way of grounding is completely new to me.
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Old 22nd June 2007, 10:11 PM   #4
SY is offline SY  United States
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My apologies, I misread your schematic. This is actually almost exactly the way I ran mine, as I've described in some other posts.
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Old 22nd June 2007, 10:59 PM   #5
316a is offline 316a  England
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Hi ,
I don't like parallelling any more than 2 valves , go 'up' a valve instead ? What range are your panels going to be used for ? I used a mains toroid connected as an autoformer and ran the diaphragm from a negative bias voltage in a semi direct drive setup . 7236 on each channel in push pull , running at 220V/50mA per side and a 3A/108A DHT on the input with 1/2 6BL7 concertina per channel . Transformer was a cheap 60VA Talema 115+115:36+36 . Sounded very nice , mind you I was only driving small >1kHz treble panels . Unfortunately the diapragm went on one channel after about 1 week's use . Amp is at present a christmas tree and I'm now into horns

cheers

316a
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