ASR COLLECTOR preamp (German) - diyAudio
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Old 7th December 2009, 07:07 PM   #1
brianco is offline brianco  Ireland
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Default ASR COLLECTOR preamp (German)

I have a German made 'ASR Collector' preamplifier with fully load adjustable MC & MM phono section and also a line outline capability. It has an external mains supply power supply (in a separate rack mount enclosure). It appears to be an 1980s design from its use of Toshiba JFETS.

It is beautifully made using high quality components throughout and performs well.

Can anyone post here (or PM me) with a schematic for this obviously highend and costly preamp. If so I will be very grateful indeed.

I would also like to know of any 'tweeks' which are standard for this preamp. Again I will be pleased for any information as until very recently ASR is a maker which has been virtually unknown in the UK.

Thanks again,

Brian
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Old 7th December 2009, 07:14 PM   #2
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I also need a schematic of this device to investigate the possibilities of sound quality enhancing
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Old 7th December 2009, 10:51 PM   #3
brianco is offline brianco  Ireland
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IF someone sends me the schematic I will ask if I can forward you a copy.

What is your opinion of this preamp? It seems to me to be very good for its age.
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Old 8th December 2009, 12:26 AM   #4
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Hope this can help you.
Attached Images
File Type: jpg SH2 Collector 88-91 02.jpg (163.7 KB, 456 views)
File Type: jpg SH02 Collector 88-91 02.jpg (130.4 KB, 436 views)
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Old 8th December 2009, 05:41 AM   #5
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Very cool Lumanauw, thanks.
I have never seen servos where the integration is entirely "passive". Any advantages to this apart from the possiblity to use non unity gain stable opamps?
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Old 8th December 2009, 09:01 AM   #6
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Quote:
Originally Posted by lumanauw View Post
Hope this can help you.
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Old 8th December 2009, 09:35 AM   #7
brianco is offline brianco  Ireland
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Quote:
Originally Posted by lumanauw View Post
Hope this can help you.
YES, lumanauw, they most certainly DO help!!!

And from me most extreme thanks!!!!!

Anyone got any opinions on this preamp???

Good luck,

Brian
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Old 8th December 2009, 09:48 AM   #8
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In case anyone would like to see some pics of the thing : http://www.asraudio.de/Dpdf/HistDBasColl.pdf

Only preamp model i've encountered that can directly drive a K1000. (7.5-8W in 8 output stage)
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Old 8th December 2009, 09:50 AM   #9
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nice one

at first - quick- look I see possibility to swap double diff bjts with jfets ....

maybe some other tweak ..... - nice cap multipliers , for each channel separately ;

anyone willing to take some pics , and write something about exact physical layout ?

edit :

I see that Jaccovitty is always smarter than I am ....... even if that's easy task .....
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Last edited by Zen Mod; 8th December 2009 at 09:57 AM.
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Old 8th December 2009, 10:01 AM   #10
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That's because i'm the other half-wit.

(the 8W output remark refers to the last Collector model, runs on 24V rails and 2-pair MOSFET output stage)
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