Headphone amplifiers

Problem QRV-09

Started by joBe

Replies: 4
Views: 4,758

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

BF471/BF472 in QRV01

Started by goldkenn

Replies: 1
Views: 4,737

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

Problem with QRV07

Started by Bertel

Replies: 7
Views: 4,669

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

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

Started by DDragon80

Replies: 0
Views: 4,644

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

qrv-07 building and test

Started by Jinkslynx

Replies: 2
Views: 4,313

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

QRV-07 gain

Started by peterklimo

Replies: 3
Views: 4,209

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

QRV09 Voltage

Started by Forte

Replies: 4
Views: 4,068

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

QRV-08 setup questions

Started by mabu0815

Replies: 4
Views: 4,040

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

QRV-08 Place to connect PWR LED

Started by chinook9

Replies: 4
Views: 4,016

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

Headphone amp for AKG K-1000

Started by goldkenn

Replies: 1
Views: 4,002

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

Cleaning the PCB

Started by Houghtkj

Replies: 2
Views: 3,926

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

Questions about QRV01 QRV03 QRV08

Started by semola

Replies: 1
Views: 3,915

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

Which kit good to Balanced Headamp?

Started by palchiu

Replies: 3
Views: 3,908

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

Tobias' QRV-07 bygge

Started by peranders

Replies: 0
Views: 3,904

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

QRV-09 - rectifiern funkar sådär bakvänd

Started by maust

Replies: 2
Views: 3,843

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

Best headphone am for ~8ohms...?

Started by Bertel

Replies: 3
Views: 3,792

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

QRV-08 OP Amp replacement

Started by alexanderbax

Replies: 4
Views: 3,772

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

Using QRV-08 as a Preamp

Started by chinook9

Replies: 2
Views: 3,713

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

Which fuse for QRV07

Started by Consystor

Replies: 1
Views: 3,703

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

QRV-08 C41 and C42

Started by Hayo

Replies: 4
Views: 3,696

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

QRV-07 problem

Started by peranders

Replies: 0
Views: 3,573

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

QRV-04 as a line stage

Started by peranders

Replies: 0
Views: 3,513

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

wich of the amps have better quality?

Started by samsagaz

Replies: 1
Views: 3,395

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

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

Started by mabu0815

Replies: 2
Views: 3,345

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

QRV03 questions

Started by peranders

Replies: 0
Views: 3,342

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

QRV-07 Power supply stage

Started by ColinS

Replies: 1
Views: 3,312

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

QRV08 - Humming sound from transformers

Started by mabu0815

Replies: 1
Views: 3,127

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

Case for QRV08

Started by joze7205

Replies: 0
Views: 3,077

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