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11-16-2007, 12:31 PM
#1

diamondsouled

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Acrosound Archive

I have created a yahoo group
specifically for archiving information on Acrosound products. Anyone with
schematics, manuals, or whatever, if you could up-load what you have to:http://tech.groups.yahoo.com/group/acrosound/?yguid=200332169

... it would be greatly appreciated. I have made it a moderated group to
eliminate spam so you will have to join to upload or download
information.
Any pictures or history would be appreciated as
well.

Thanks

Larry Rowe

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11-16-2007, 12:35 PM
#2

hjames

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Hi Larry - Ok, I'll bite -
what is Acrosound - some kind of regional product?

Originally Posted by diamondsouled

I have created a yahoo group specifically for archiving
information on Acrosound products.

Thanks

Larry Rowe

2ch - Oppo981, JoLida502, AA DDE3 DAC, UREI
809A, VonS VR4
HT7- XDA-2, BDP93, B&K amps, Vandy 3A, 2Ce, VCC1,
TF600 & JBL 4641

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11-16-2007, 12:40 PM
#3

speakerdave

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Originally Posted by hjames

Hi Larry - Ok, I'll bite - what is Acrosound - some
kind of regional product?

Outstanding transformers
and power amps, the amps so collectible they've virtually disappeared from
the market. Founded by David Hafler, who later went on the create Dynaco.
OK?

Article on Hafler at Stereophile:

http://www.stereophile.com/news/11661/

I can't
find anything on the power amps, so maybe I'm misremembering. Back in the
seventies (when you were still chasing butterflies, I 'spects) I had a
beautiful little 6bq5 power amp (gold and pale green) which I incautiously
resold; it seems to me it was Acrosound. I also seem to remember an
Acrosound power amp cropping up on ebay a while ago; I think it disappeared
before the auction could finish.

Yes. It was the Acrosound 20-20.
Here's a bad photo cribbed from the internet of one that looks beat and
bowdlerized; one of the output tranformers had been replaced with something
else:

David

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11-16-2007, 12:50 PM
#4

hjames

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Thanks Dave -
I had a
friend with a Dynaco 400 amp but never knew the preceding gear's story.

2ch - Oppo981, JoLida502, AA DDE3 DAC, UREI
809A, VonS VR4
HT7- XDA-2, BDP93, B&K amps, Vandy 3A, 2Ce, VCC1,
TF600 & JBL 4641

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11-16-2007, 01:06 PM
#5

speakerdave

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Originally Posted by hjames

Thanks Dave -
I had a friend with a Dynaco 400 amp
but never knew the preceding gear's story.

That
deservedly well-regarded amp was drawn by another audio legend, James
Bongiorno, who later founded The Great American Sound Company (Ampzilla et.
al.).

David

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11-16-2007, 04:27 PM
#6

diamondsouled

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Originally Posted by hjames

Hi Larry - Ok, I'll bite - what is Acrosound - some
kind of regional product?

It was regional at one
time, they were built in Philadelphia the home of Dynaco and many other fine
audio products.

I own a pair of Ultralinear II monoblocks as well as
a S1001 preamp.

Lar

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11-16-2007, 05:41 PM
#7

speakerdave

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Nice--very nice. Are they
EL34?

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11-16-2007, 06:01 PM
#8

diamondsouled

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Originally Posted by speakerdave

Nice--very nice. Are they
EL34?

They can run on either EL34s or KT88-6550s.

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11-17-2007, 01:54 PM
#9

10
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More literature at
hifilit.com

http://www.hifilit.com/hifilit/Acrosound/acrosound.htm

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11-17-2007, 01:55 PM
#10

diamondsouled

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Originally Posted by speakerdave

Nice--very nice. Are they
EL34?

Here's the first page of the Sams Photofact
which tells you how to rebias for KT88-6550:

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11-17-2007, 10:19 PM
#11

Hoerninger

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Based on ACROSOUND:

http://www.jogis-roehrenbude.de/Leserbriefe/Jochen-Wankmiller-Acrosound/Acro_6-50.htm

___________
Peter

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11-18-2007, 12:37 PM
#12

diamondsouled

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Nice amp Peter!!

I've
become interested in using the 6SN7 as a driver tube.

Is the design
based on David Hafler's Acrosound Ultralinear designs. What transformers are
being used? I know that Sowter makes an Acrosound TO-350 remake transformer
is that what is being used?

http://www.sowter.co.uk/

Cheers

Larry

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11-18-2007, 01:04 PM
#13

Hoerninger

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Larry,

it is the work
of Jochen Wankmiller, he made his own transformers as far as I have
understood. I have no time for DIY right now.
http://www.jogis-roehrenbude.de/Leserbriefe/Jochen-Wankmiller-Acrosound/Acro_6-50.htm
Translation (Hope it works)
__________
Peter

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