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Old 2nd April 2003, 09:50 AM   #1
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Question BOAK Power supply

Hello,

I've built a set of power ams which sound ok. Now somebody told me that a BOAK power supply can improve the sound further.
Does anyone know this design or has a usefull link or schematic ???

I searched the net for an hour or so but have not found anything yet.
So.... if anyone has anything.. let me know

Grtz,
Nick
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Old 2nd April 2003, 10:03 AM   #2
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This supply was in an old Audio Amateur. If I remember correctly it was a robust emitter follower regulator. Bill
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Old 2nd April 2003, 04:48 PM   #3
slydwz is offline slydwz  United States
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I believe it was in Issue 2 of 1980, with an update by Walt Jung in a 1981 issue. I have them packed away at home. I'll see if I can dig them out tonight. Stay tuned.
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Old 3rd April 2003, 10:56 AM   #4
slydwz is offline slydwz  United States
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Actually issues 1/80 and 2/81. I'll send you an e-mail.
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Old 3rd April 2003, 12:38 PM   #5
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Default any comments on the boak regulator

Does anyone have any experience with this regulator? It was suggested for the A-40 & ST-150...I am curious if anyone tried it and what they think of it.

It seemed like it required a pretty high input voltage compared to the regulated output...or is this ratio pretty normal?

Also...does anyone have a clean picture of the artwork for the board? I don't think the boards are available from Old Colony at this time.

thanx
rt
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Old 3rd April 2003, 01:09 PM   #6
slydwz is offline slydwz  United States
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Default Re: any comments on the boak regulator

Quote:
Originally posted by 1/137
Does anyone have any experience with this regulator? It was suggested for the A-40 & ST-150...I am curious if anyone tried it and what they think of it.

It seemed like it required a pretty high input voltage compared to the regulated output...or is this ratio pretty normal?

Also...does anyone have a clean picture of the artwork for the board? I don't think the boards are available from Old Colony at this time.

thanx
rt
Send me an e-mail and I'll send you a pic from the article.
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Old 4th April 2003, 11:03 AM   #7
slydwz is offline slydwz  United States
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The check's in the mail, fellas. Except for Nick, your server rejected due to size of the attachments. I tried compression and sending them individually but was still prevented. If you have an alternate path, please forward to me and I'll resend. Or if you prefer, send me your address and I'll make photocopies and we can do it the old fashioned way.
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Old 4th April 2003, 11:15 AM   #8
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Great! Thank you for the file.
rt
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Old 23rd August 2003, 04:04 AM   #9
Mikett is offline Mikett  Canada
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In case you have not built the PS yet. Here are some comments.

In 1982 I added a Boak/Jung regulator to my Leach Low TIM power amps I had built. This amp was compared to another Leach that had 500VA toroids. Mine had a 350 VA standard transformer and the RS boost transformers that the articles used. The other amp was of superior build quality and also used flat copper conductors like some are using today. All amps were monoblocks or dual monos.

The difference in the amps was immediate and not at all subtle. The bass was more dynamic and solid, giving the sense that there was unlimited power. It seemed as though we had gotten new speakers and if anything the article is conservative in what was to be expected. The soundstage was also more three dimensional and open.

Will it do it in your amp. Don't know. We listened to a similarly modified ST150 and it was not even close to the sound of the Leaches. Maybe the Leach amp was better.

My friend immediately added regulators to his as well. However, he also doubted what should have been of little benefit and modifed another of his Leach's front end by cascoding. The regulated amp still sounded better by a long shot.

It is not a cheap option. My friend also took the time to design a board that combined the boak regulator with Jung's preregulator. These were used in all of my amps.
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Old 22nd February 2005, 09:04 PM   #10
LBHajdu is offline LBHajdu  United States
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I would also like to see the BOAK power supply / regulator. As I am looking for a regulator powerful enough to regulate the leach amp I am building. Could someone post it or e-mail it to me (LBHajdu@optonline.net).
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