Headphone amplifiers

QRV-08 gain reduction

Started by Discom

Replies: 3
Views: 6,318

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

QRV-08 power up

Started by svarthvitt

Pages1 2 3

Replies: 43
Views: 20,695

June 13, 2019, 09:11:47 PM
by svarthvitt

QRV-08 Place to connect PWR LED

Started by chinook9

Replies: 4
Views: 4,093

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

Using QRV-08 as a Preamp

Started by chinook9

Replies: 2
Views: 3,715

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

QRV-03 question

Started by krainov

Replies: 9
Views: 4,863

May 05, 2018, 01:27:58 PM
by peranders

QRV-08 Build Problems/Questions

Started by chinook9

Replies: 10
Views: 5,674

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

QRV-08 OP Amp replacement

Started by alexanderbax

Replies: 4
Views: 3,811

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

QRV-08 Build #3

Started by BMF

Replies: 7
Views: 5,014

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

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

Started by DDragon80

Replies: 0
Views: 4,703

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

QRV08 Setup Instructions

Started by BMF

Pages1 2 3 4 5 6 7

Replies: 97
Views: 31,559

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

QRV-04 failure

Started by savinalexandru

Replies: 8
Views: 5,865

May 09, 2016, 02:29:55 PM
by savinalexandru

QRV-08 C41 and C42

Started by Hayo

Replies: 4
Views: 3,700

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

QRV08 - Humming sound from transformers

Started by mabu0815

Replies: 1
Views: 3,137

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

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

Started by mabu0815

Replies: 2
Views: 3,369

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

Headphone amplifier for HiFiMAN HE-6

Started by jimvibe

Replies: 7
Views: 5,763

June 12, 2015, 08:02:27 PM
by peranders

QRV-09 - rectifiern funkar sådär bakvänd

Started by maust

Replies: 2
Views: 3,942

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

QRV-08 - ett fel och ett misstag

Started by maust

Replies: 13
Views: 6,060

March 19, 2015, 10:55:57 PM
by maust

QRV-08 with 12V rails

Started by jezz

Replies: 11
Views: 6,017

January 17, 2015, 09:47:29 AM
by peranders

QRV09 Voltage

Started by Forte

Replies: 4
Views: 4,074

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

QRV-08 setup questions

Started by mabu0815

Replies: 4
Views: 4,039

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

QRV09 Capacitor wrong size

Started by jhmvanbeek

Replies: 5
Views: 4,742

March 02, 2014, 10:32:35 AM
by jhmvanbeek

Problem QRV-09

Started by joBe

Replies: 4
Views: 4,742

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

QRV08 output voltage offset and the servo

Started by Kingston

Replies: 8
Views: 6,480

December 06, 2013, 09:38:49 PM
by peranders

QRV-08 Building and test

Started by galouche

Pages1 2 3 4 5

Replies: 71
Views: 36,935

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

My QRV08 Build

Started by Houghtkj

Replies: 7
Views: 5,926

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

Cleaning the PCB

Started by Houghtkj

Replies: 2
Views: 3,933

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

QRV-08 Parts Selection

Started by Houghtkj

Replies: 5
Views: 5,713

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

Which fuse for QRV07

Started by Consystor

Replies: 1
Views: 3,694

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

QRV09

Started by csyao

Replies: 4
Views: 5,086

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

QRV-08 hum

Started by CapRock

Pages1 2 3 4 5

Replies: 63
Views: 29,258

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