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-   -   ASR COLLECTOR preamp (German) (http://www.diyaudio.com/forums/solid-state/156371-asr-collector-preamp-german.html)

brianco 7th December 2009 07:07 PM

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

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

2 Attachment(s)
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 (Post 2005536)
Hope this can help you.

:worship::worship::worship::worship::worship:

brianco 8th December 2009 09:35 AM

Quote:

Originally Posted by lumanauw (Post 2005536)
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 8th December 2009 09:50 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 ..... :rofl:

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)


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