Headphone amplifiers

QRV-07 DC problem

Started by alerma

Replies: 6
Views: 8,596

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

QRV-08 OP Amp replacement

Started by alexanderbax

Replies: 4
Views: 8,759

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

QRV-07

Started by AudioSpirit

Replies: 1
Views: 9,703

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

Problem with QRV07

Started by Bertel

Replies: 7
Views: 7,948

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

Best headphone am for ~8ohms...?

Started by Bertel

Replies: 3
Views: 6,557

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

QRV08 Setup Instructions

Started by BMF

Pages1 2 3 4 5 6 7

Replies: 97
Views: 63,609

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

QRV-08 Build #3

Started by BMF

Replies: 7
Views: 10,682

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

QRV-08 hum

Started by CapRock

Pages1 2 3 4 5

Replies: 63
Views: 52,501

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

QRV-08 PANEL MOUNT POT

Started by CapRock

Replies: 7
Views: 8,718

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

QRV-08 Place to connect PWR LED

Started by chinook9

Replies: 4
Views: 9,862

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

QRV-08 Build Problems/Questions

Started by chinook9

Replies: 10
Views: 12,067

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

Using QRV-08 as a Preamp

Started by chinook9

Replies: 2
Views: 8,476

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

QRV-07 Power supply stage

Started by ColinS

Replies: 1
Views: 5,891

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

Which fuse for QRV07

Started by Consystor

Replies: 1
Views: 7,855

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

QRV-08 (General Questions)

Started by cota

Replies: 9
Views: 8,853

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

QRV09

Started by csyao

Replies: 4
Views: 10,116

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: 9,156

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

QRV06 topologie for power amplifier

Started by Digora

Replies: 9
Views: 10,415

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

QRV-08 gain reduction

Started by Discom

Replies: 3
Views: 17,637

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

QRV09 Voltage

Started by Forte

Replies: 4
Views: 8,727

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

Adding a volumecontrol to QRV-07

Started by Franz

Replies: 5
Views: 8,883

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: 61,638

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

Headphone amp for AKG K-1000

Started by goldkenn

Replies: 1
Views: 6,691

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

QRV01 output stage

Started by goldkenn

Pages1 2

Replies: 19
Views: 15,644

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

BF471/BF472 in QRV01

Started by goldkenn

Replies: 1
Views: 7,699

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

Regarding QRV07

Started by goldkenn

Replies: 6
Views: 8,143

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

QRV-08 C41 and C42

Started by Hayo

Replies: 4
Views: 8,588

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

QRV-03 gain

Started by hms

Replies: 0
Views: 259

May 15, 2024, 12:58:36 PM
by hms

QRV-08 Parts Selection

Started by Houghtkj

Replies: 5
Views: 10,754

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

Cleaning the PCB

Started by Houghtkj

Replies: 2
Views: 8,396

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