Discrete OPAMP - Page 3

tomat · 15th September 2008, 05:45 PM

Hi
i'm interest to order ,how is the way ? ,i was sent you email about two days ago but not get a reply.
can you tell me the difference of new SUN with the older version? and the MOON also

thanks

audio-gd · 16th September 2008, 12:36 AM

I will reply every email,
It seem I have not received your email.
When I received your email, my mailbox will send a reply email automatic, and I will send another reply in 24 hours.

About SUN(version 2),We thought about some customers feedbacks , then we have in allusion to adjust the circuits and parts*, improve and made OPA-SUN (version 2), OPA-SUN (v2) had more humanity than original , but keep energetic, huge dynamics and good impulse response.

Moon:This discrete opamp uses dual differential*gain stage and single ended output stage circuit design , we try and listen long term . The OPA-Moon sound characteristics is had a bit tubelike taste (vacuum valve) , soft and thick .

jam · 10th October 2008, 01:12 PM

Rudiger,

Could you share more information on the distortion differences with the cascode. Any differences in bandwidth?

Thanks,

Jam

Onvinyl · 10th October 2008, 01:29 PM

-3dB BW is around 8Mhz witout c, and *worse* with cascoding (5Mhz)
3rd and higher order harmonics rise at an order of magnitude, 2nd is the same (and dominating).
all simulated.

Onvinyl · 10th October 2008, 02:24 PM

oops..

but this one is an order of magnitude *better* EDIT: only with high freq (20k), 20Hz is still better without cascode!

Just an simulation trick without any connection to the real world?

Rüdiger

woodturner-fran · 11th October 2008, 10:20 AM

Would these be a direct drop in replacement for an OP27 or 37? or are they dual only?

Fran

jam · 11th October 2008, 10:58 AM

Rudiger,

Thanks. This is useful information.

Jam

16th September 2008, 12:36 AM	#22
audio-gd diyAudio Member Join Date: Oct 2004	Helo! I will reply every email, It seem I have not received your email. When I received your email, my mailbox will send a reply email automatic, and I will send another reply in 24 hours. About SUN(version 2),We thought about some customers feedbacks , then we have in allusion to adjust the circuits and parts, improve and made OPA-SUN (version 2), OPA-SUN (v2) had more humanity than original , but keep energetic, huge dynamics and good impulse response. Moon:This discrete opamp uses dual differentialgain stage and single ended output stage circuit design , we try and listen long term . The OPA-Moon sound characteristics is had a bit tubelike taste (vacuum valve) , soft and thick .

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15th September 2008, 05:45 PM	#21
tomat diyAudio Member Join Date: Dec 2007 Location: east java	Hi i'm interest to order ,how is the way ? ,i was sent you email about two days ago but not get a reply. can you tell me the difference of new SUN with the older version? and the MOON also thanks

10th October 2008, 01:12 PM	#23
jam diyAudio Member Join Date: May 2001 Location: Charlotte,NC,USA	Rudiger, Could you share more information on the distortion differences with the cascode. Any differences in bandwidth? Thanks, Jam

11th October 2008, 10:20 AM	#26
woodturner-fran diyAudio Member Join Date: Jan 2006 Location: Ireland	Would these be a direct drop in replacement for an OP27 or 37? or are they dual only? Fran

11th October 2008, 10:58 AM	#27
jam diyAudio Member Join Date: May 2001 Location: Charlotte,NC,USA	Rudiger, Thanks. This is useful information. Jam

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