Sjöström Audio DIY forum

Projects => Headphone amplifiers => Topic started by: Discom on October 29, 2018, 09:59:22 AM

Title: QRV-08 gain reduction
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?
Title: Re: QRV-08 gain reduction
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.
Title: Re: QRV-08 gain reduction
Post by: Hodgin on September 11, 2019, 03:42:45 PM
Do 330 ohms impact anything else besides the gain?
Title: Re: QRV-08 gain reduction
Post by: peranders on September 12, 2019, 07:30:03 AM
No...