Valkyrie.... line-stage preamp..... info?? - diyAudio
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Old 6th May 2007, 09:55 PM   #1
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Default Valkyrie.... line-stage preamp..... info??

Anyone have links for this preamp?
I have built Jung's AD744/AD811 circuit found on his pages, but I wonder how this Valkyrie differs ?
The only info I've found is to order backissues from AudioXpress.
It was a project published there.

Quote:
Valkyrie. A line-stage preamplifier. Utilizes high-performance op amps in the signal path. Provides a modest voltage gain of about 5 (14dB), but can be increased.
AUDIO AMATEUR 1/1994 [Mar 1994] (v.25#1) pg. 10
Correction AUDIO AMATEUR 3/1994 [Sep 1994] (v.25#3) pg. 42
Added Info AUDIO AMATEUR 3/1994 [Sep 1994] (v.25#3) pg. 45
Correction AUDIO AMATEUR 2/1995 [Jun 1995] (v.26#2) pg. 45
Added Info AUDIO ELECTRONICS 3/1999 [Jun 1999] (v.30#3) pg.39
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Old 28th June 2007, 10:10 AM   #2
Gordy is offline Gordy  United Kingdom
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Anyone?
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Old 28th June 2007, 02:05 PM   #3
Mikett is offline Mikett  Canada
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Default Valkyrie

It is the essentially the same circuit. The Valkyrie adds buffers to the tape outputs etc and is not dual mono.
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Old 29th June 2007, 11:27 AM   #4
Gordy is offline Gordy  United Kingdom
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OK.
Many thanks.
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Old 3rd January 2015, 08:18 PM   #5
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I have follow questions concerning this:
1) Who can upload the schematic and the mentioned articles from post #1?
(maybe the Schema is according fig.7 from
http://waltjung.org/PDFs/Op_Amps_in_...ircuits_P2.pdf )
2) Which commercial line preamp uses this topology?
3) Are there measuring results at different cable loads resp. different capacity loads at the output ?
4) Are there RIAA phono stages in this basic topology?

Thank you for your help.

Only follow threads here on diyaudio I have discover to this topology:
Preamp & headphone amp designs
Balanced Line Stage vs. ad811 based preamp

Last edited by tiefbassuebertr; 3rd January 2015 at 08:34 PM.
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Old 4th January 2015, 09:01 AM   #6
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Quote:
Originally Posted by tiefbassuebertr View Post
I have follow questions concerning this:
1) Who can upload the schematic and the mentioned articles from post #1?
(maybe the Schema is according fig.7 from
http://waltjung.org/PDFs/Op_Amps_in_...ircuits_P2.pdf )
2) Which commercial line preamp uses this topology?
3) Are there measuring results at different cable loads resp. different capacity loads at the output ?
4) Are there RIAA phono stages in this basic topology?

Thank you for your help.

Only follow threads here on diyaudio I have discover to this topology:
Preamp & headphone amp designs
Balanced Line Stage vs. ad811 based preamp
an additional question rises up: who I can find a simlified schematic of the AD811?
one more URL in this case:
Jung's line drvr, use parallel AD811's?
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