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1
Headphone amplifiers / Re: QRV-08 gain reduction
« Last post by peranders on October 30, 2018, 07:05:41 PM »
R14 and E14 can be changed. 330 ohms will set the gain to 2.
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Headphone amplifiers / QRV-08 gain reduction
« Last post by Discom on October 29, 2018, 09:59:22 AM »

I’ve completed the QRV-08 a few months ago and it has playing happily ever since. You weren’t kidding when you said it reveals poor recordings. I'll post a picture when I get around to taking one.
 
I’ve found the standard gain of 4 to be too high with an AMB gamma 3 and a set of HD650s. Which resistors should I change to reduce the gain, and what values would you recommend for a gain of 2 or 1 respectively?
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Headphone amplifiers / Re: Using QRV-08 as a Preamp
« Last post by chinook9 on July 24, 2018, 04:12:51 PM »
Thank you P-A.  I suspected as much but I wanted to confirm it.

The original enclosure I used is a bit too small and I have not completed a neat installation.  I recently received a slightly bigger enclosure and I may have room to put in RCA preamp-out jacks.

The QRV-8 sounds as good as a preamp as it does with headphones.

Thanks again


Brian
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Headphone amplifiers / Re: Using QRV-08 as a Preamp
« Last post by peranders on July 24, 2018, 07:32:26 AM »
The amp can be used as a preamp.
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Headphone amplifiers / Using QRV-08 as a Preamp
« Last post by chinook9 on July 23, 2018, 11:12:47 PM »
heaveno P-A!

I have been enjoying my QRV-08 for a while now. I haven't put it in its final enclosure but I will do so this winter.  I'll post a picture to Facebook then.

I read on a forum that someone was using their QRV-08 as a preamp.  I tried my QRV-08 as a preamp running the headphone output through a series of adapters to the inputs on a Krell KSA-100 into Thiel CS3.6 speakers.  The system sounds the best it ever.

Is using the QRV-08 as a preamp OK or might I cause problems in the QRV-08? I only have to turn the volume control about 1/3 rotation to get high volume.

Thank you,

Brian
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Headphone amplifiers / Re: QRV-03 question
« Last post by peranders on May 05, 2018, 01:27:58 PM »
Sent :) If you want the patent document, I have it. let me know if you want it.
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Headphone amplifiers / Re: QRV-03 question
« Last post by krainov on May 05, 2018, 11:35:17 AM »
Yes, please! Send it to krainovrv(at)yandex.ru
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Headphone amplifiers / Re: QRV-03 question
« Last post by peranders on May 03, 2018, 07:18:06 PM »
You can also take a look at the application note AN-211. I have also a file with a high resolution than the one you can find on the net. Send me an email in case you want it.

http://www.analog.com/media/en/technical-documentation/application-notes/58052492001115525484056221917334AN211.pdf
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Headphone amplifiers / Re: QRV-03 question
« Last post by peranders on May 03, 2018, 07:10:33 PM »
Net names with EXACTLY the same name are connected together.
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Headphone amplifiers / Re: QRV-03 question
« Last post by krainov on May 03, 2018, 06:34:27 PM »
heaveno P-A!
The Input stage channel and Current amp and output stage connected only with one port? It is not clear for me coz the port names are differ.
Are they connected only here? (See the attachment)
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