Headphone amplifiers

QRV-07 DC problem

Started by alerma

Replies: 6
Views: 8,123

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

Problem QRV-09

Started by joBe

Replies: 4
Views: 8,031

January 19, 2014, 05:00:23 PM
by peranders

Regarding QRV07

Started by goldkenn

Replies: 6
Views: 7,689

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

Problem with QRV07

Started by Bertel

Replies: 7
Views: 7,537

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

QRV-08 setup questions

Started by mabu0815

Replies: 4
Views: 7,401

November 01, 2014, 05:09:57 PM
by Matthias

BF471/BF472 in QRV01

Started by goldkenn

Replies: 1
Views: 7,324

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

QRV09 Voltage

Started by Forte

Replies: 4
Views: 7,323

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

QRV-08 OP Amp replacement

Started by alexanderbax

Replies: 4
Views: 7,320

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

Using QRV-08 as a Preamp

Started by chinook9

Replies: 2
Views: 7,236

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

Cleaning the PCB

Started by Houghtkj

Replies: 2
Views: 7,227

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

QRV-09 - rectifiern funkar sådär bakvänd

Started by maust

Replies: 2
Views: 7,221

March 21, 2015, 01:07:03 AM
by maust

QRV-08 C41 and C42

Started by Hayo

Replies: 4
Views: 7,156

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

qrv-07 building and test

Started by Jinkslynx

Replies: 2
Views: 7,140

May 14, 2007, 06:43:22 PM
by Jinkslynx

QRV-07 gain

Started by peterklimo

Replies: 3
Views: 6,962

December 08, 2007, 02:23:37 PM
by peranders

Which fuse for QRV07

Started by Consystor

Replies: 1
Views: 6,785

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

Tobias' QRV-07 bygge

Started by peranders

Replies: 0
Views: 6,587

November 06, 2005, 08:23:19 AM
by peranders

QRV08 - IC4/5 and IC 8/9 LM431 must be populated?

Started by mabu0815

Replies: 2
Views: 6,540

October 16, 2015, 11:36:58 AM
by mabu0815

Headphone amp for AKG K-1000

Started by goldkenn

Replies: 1
Views: 6,413

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

Which kit good to Balanced Headamp?

Started by palchiu

Replies: 3
Views: 6,412

November 21, 2010, 11:10:34 AM
by peranders

QRV08 - Humming sound from transformers

Started by mabu0815

Replies: 1
Views: 6,302

February 04, 2016, 07:01:18 PM
by peranders

Questions about QRV01 QRV03 QRV08

Started by semola

Replies: 1
Views: 6,293

March 03, 2010, 03:34:43 PM
by peranders

Best headphone am for ~8ohms...?

Started by Bertel

Replies: 3
Views: 6,200

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

QRV-07 problem

Started by peranders

Replies: 0
Views: 5,869

March 20, 2006, 09:45:07 PM
by peranders

QRV-04 as a line stage

Started by peranders

Replies: 0
Views: 5,818

October 09, 2006, 02:39:00 PM
by peranders

wich of the amps have better quality?

Started by samsagaz

Replies: 1
Views: 5,710

December 28, 2009, 04:57:57 AM
by peranders

QRV-07 Power supply stage

Started by ColinS

Replies: 1
Views: 5,625

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

QRV03 questions

Started by peranders

Replies: 0
Views: 5,604

February 23, 2009, 09:10:59 PM
by peranders

Case for QRV08

Started by joze7205

Replies: 0
Views: 5,320

October 27, 2009, 07:51:43 PM
by joze7205