Headphone amplifiers

QRV-07 DC problem

Started by alerma

Replies: 6
Views: 6,468

January 01, 2007, 10:16:32 AM
by alerma

QRV-08 OP Amp replacement

Started by alexanderbax

Replies: 4
Views: 5,206

January 31, 2017, 08:38:38 PM
by peranders

QRV-07

Started by AudioSpirit

Replies: 1
Views: 7,154

September 13, 2005, 07:15:26 AM
by peranders

Problem with QRV07

Started by Bertel

Replies: 7
Views: 5,928

March 17, 2010, 06:06:32 PM
by peranders

Best headphone am for ~8ohms...?

Started by Bertel

Replies: 3
Views: 4,739

March 25, 2010, 05:52:19 AM
by qusp

QRV-08 Build #3

Started by BMF

Replies: 7
Views: 6,680

January 11, 2017, 12:25:18 AM
by BMF

QRV08 Setup Instructions

Started by BMF

Pages1 2 3 4 5 6 7

Replies: 97
Views: 41,089

July 25, 2016, 05:28:38 AM
by BMF

QRV-08 PANEL MOUNT POT

Started by CapRock

Replies: 7
Views: 6,716

January 20, 2011, 08:54:29 PM
by peranders

QRV-08 hum

Started by CapRock

Pages1 2 3 4 5

Replies: 63
Views: 36,213

April 27, 2011, 08:23:05 PM
by peranders

Using QRV-08 as a Preamp

Started by chinook9

Replies: 2
Views: 5,058

July 24, 2018, 04:12:51 PM
by chinook9

QRV-08 Place to connect PWR LED

Started by chinook9

Replies: 4
Views: 5,693

March 20, 2019, 11:03:23 AM
by peranders

QRV-08 Build Problems/Questions

Started by chinook9

Replies: 10
Views: 7,622

April 26, 2017, 04:32:13 PM
by chinook9

QRV-07 Power supply stage

Started by ColinS

Replies: 1
Views: 4,147

July 21, 2009, 03:50:54 PM
by peranders

Which fuse for QRV07

Started by Consystor

Replies: 1
Views: 4,797

July 24, 2011, 10:39:17 PM
by peranders

QRV-08 (General Questions)

Started by cota

Replies: 9
Views: 6,709

February 16, 2010, 11:56:59 AM
by qusp

QRV09

Started by csyao

Replies: 4
Views: 6,524

June 08, 2011, 04:31:51 AM
by csyao

QRV-03 or QRV-09 with Burson Audio V5-OPA-S?

Started by DDragon80

Replies: 0
Views: 6,139

August 09, 2016, 04:52:24 PM
by DDragon80

QRV06 topologie for power amplifier

Started by Digora

Replies: 9
Views: 8,293

March 04, 2008, 12:35:03 PM
by peranders

QRV-08 gain reduction

Started by Discom

Replies: 3
Views: 8,559

September 12, 2019, 07:30:03 AM
by peranders

QRV09 Voltage

Started by Forte

Replies: 4
Views: 5,243

November 24, 2014, 05:58:14 PM
by Forte

Adding a volumecontrol to QRV-07

Started by Franz

Replies: 5
Views: 6,869

July 23, 2007, 09:18:29 AM
by peranders

QRV-08 Building and test

Started by galouche

Pages1 2 3 4 5

Replies: 71
Views: 43,909

August 24, 2012, 06:16:42 PM
by galouche

BF471/BF472 in QRV01

Started by goldkenn

Replies: 1
Views: 5,733

March 19, 2011, 04:16:51 PM
by peranders

QRV01 output stage

Started by goldkenn

Pages1 2

Replies: 19
Views: 12,237

August 30, 2010, 08:14:23 AM
by peranders

Regarding QRV07

Started by goldkenn

Replies: 6
Views: 6,139

June 17, 2010, 08:44:50 PM
by peranders

Headphone amp for AKG K-1000

Started by goldkenn

Replies: 1
Views: 4,926

November 08, 2008, 06:17:25 PM
by peranders

QRV-08 C41 and C42

Started by Hayo

Replies: 4
Views: 5,013

May 02, 2016, 11:54:47 AM
by peranders

My QRV08 Build

Started by Houghtkj

Replies: 7
Views: 7,515

May 04, 2012, 08:43:10 PM
by peranders

QRV-08 Parts Selection

Started by Houghtkj

Replies: 5
Views: 7,069

March 22, 2012, 07:57:26 PM
by peranders

Cleaning the PCB

Started by Houghtkj

Replies: 2
Views: 5,211

April 02, 2012, 08:25:29 PM
by Houghtkj