ESL amp again!

revintage · 22nd June 2007, 05:35 PM

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 don´t 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

SY · 22nd June 2007, 06:19 PM

Unless you're really, really, really confident about your stator insulation, you might want to consider the safety hazrd.

revintage · 22nd June 2007, 10:01 PM

Hi Sy,
Please explain a little more as I am not sure how you mean. This way of grounding is completely new to me.

SY · 22nd June 2007, 10:11 PM

My apologies, I misread your schematic. This is actually almost exactly the way I ran mine, as I've described in some other posts.

316a · 22nd June 2007, 10:59 PM

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

22nd June 2007, 05:35 PM	#1
revintage diyAudio Member Join Date: May 2007 Location: Eskilstuna, Sweden	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 don´t 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 __________________ Brgds Lars

22nd June 2007, 06:19 PM	#2
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Unless you're really, really, really confident about your stator insulation, you might want to consider the safety hazrd. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

22nd June 2007, 10:01 PM	#3
revintage diyAudio Member Join Date: May 2007 Location: Eskilstuna, Sweden	Hi Sy, Please explain a little more as I am not sure how you mean. This way of grounding is completely new to me. __________________ Brgds Lars

22nd June 2007, 10:11 PM	#4
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	My apologies, I misread your schematic. This is actually almost exactly the way I ran mine, as I've described in some other posts. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

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22nd June 2007, 10:59 PM	#5
316a diyAudio Member Join Date: Dec 2002 Location: West London	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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