ASR COLLECTOR preamp (German)

brianco · 7th December 2009, 07:07 PM

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

tiefbassuebertr · 7th December 2009, 07:14 PM

I also need a schematic of this device to investigate the possibilities of sound quality enhancing

brianco · 7th December 2009, 10:51 PM

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.

lumanauw · 8th December 2009, 12:26 AM

Hope this can help you.

analog_sa · 8th December 2009, 05:41 AM

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?

tiefbassuebertr · 8th December 2009, 09:01 AM

Quote:

Originally Posted by lumanauw

Hope this can help you.

brianco · 8th December 2009, 09:35 AM

Quote:

Originally Posted by lumanauw

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

jacco vermeulen · 8th December 2009, 09:48 AM

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)

Zen Mod · 09:57 AM

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 .....

jacco vermeulen · 8th December 2009, 10:01 AM

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)

7th December 2009, 07:07 PM	#1
brianco diyAudio Member Join Date: Aug 2005 Location: Scottish Borders - Kelso; on the famous Tweed River!	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

8th December 2009, 09:48 AM	#8
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao	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) __________________ Not so much,.......if it says "ZM" in the corner.

8th December 2009, 09:50 AM	#9
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	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 ..... __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb Last edited by Zen Mod; 8th December 2009 at 09:57 AM.

8th December 2009, 10:01 AM	#10
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao	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) __________________ Not so much,.......if it says "ZM" in the corner.

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7th December 2009, 07:14 PM	#2
tiefbassuebertr diyAudio Member Join Date: Jul 2005 Location: D-55629 Schwarzerden	I also need a schematic of this device to investigate the possibilities of sound quality enhancing

7th December 2009, 10:51 PM	#3
brianco diyAudio Member Join Date: Aug 2005 Location: Scottish Borders - Kelso; on the famous Tweed River!	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.

8th December 2009, 05:41 AM	#5
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	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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