Phono RIAA amplifiers

Replacement, Operational Amplifier DIL-8, MAX420EPA+

Started by zz1969

Replies: 5
Views: 11,279

February 05, 2014, 10:39:03 PM
by peranders

Correct load for MM

Started by zz1969

Replies: 2
Views: 8,745

March 22, 2013, 12:48:21 PM
by zz1969

QSXM2 questions.

Started by zz1969

Replies: 2
Views: 8,626

October 08, 2013, 08:30:13 PM
by fantast

QSXM2 problem

Started by zayance

Pages1 2 3

Replies: 39
Views: 29,553

January 30, 2021, 11:15:40 AM
by peranders

qsxm3

Started by yiancar

Pages1 2 3 4

Replies: 55
Views: 40,298

November 02, 2013, 07:41:46 PM
by peranders

Obsolete MAX420

Started by wopo

Replies: 2
Views: 6,957

October 18, 2009, 03:12:56 PM
by goldkenn

QSXM2 troubleshooting!!

Started by W1DAN

Pages1 2

Replies: 16
Views: 15,107

February 13, 2021, 01:57:44 AM
by W1DAN

Humming QSXM3

Started by VesaK

Replies: 2
Views: 8,448

December 20, 2014, 06:19:16 PM
by VesaK

Cool QSXM3

Started by VesaK

Replies: 3
Views: 9,736

March 16, 2015, 04:26:43 PM
by peranders

QSXM2 - BOM questions, etc.

Started by tk-don

Replies: 8
Views: 12,009

March 02, 2014, 08:40:54 AM
by peranders

QSXM2 - various debugging

Started by tk-don

Replies: 13
Views: 14,666

June 08, 2015, 09:36:21 PM
by tk-don

QSXM2 - considering buying PCB, questions

Started by tk-don

Replies: 1
Views: 8,060

January 21, 2014, 09:07:10 PM
by peranders

QSXM2 - My realisation

Started by slimak

Replies: 1
Views: 5,995

June 26, 2022, 04:29:44 PM
by slimak

QSXM2: Greetings from Germany / Bulgaria!

Started by sinigersky

Replies: 5
Views: 8,740

April 16, 2007, 06:55:52 AM
by peranders

Ribbon microphone

Started by roberto.missoli

Replies: 6
Views: 10,855

November 14, 2011, 09:59:26 PM
by peranders

SYMMETRICAL CARTRIDGE-CONNECTION

Started by roberto.missoli

Replies: 5
Views: 9,060

December 13, 2008, 08:59:06 PM
by peranders

QSX03 A new RIAA amp with passive RIAA correction

Started by peranders

Pages1 2

Replies: 23
Views: 40,195

March 04, 2023, 09:05:31 AM
by goldkenn

QSXM3 hum problems

Started by peranders

Pages1 2

Replies: 18
Views: 18,522

April 11, 2006, 11:58:37 AM
by peranders

QSXM2 Input Transistor Biasing

Started by MattB94

Replies: 0
Views: 7,561

October 05, 2023, 02:51:41 AM
by MattB94

QSXM3 FET

Started by Marcos

Replies: 1
Views: 9,301

August 06, 2005, 10:23:18 AM
by peranders

Transistor select for QSXM2

Started by horvlas

Replies: 6
Views: 12,453

August 09, 2012, 06:36:17 PM
by peranders

QSXM2, separate PSU ?

Started by Goofy

Replies: 3
Views: 8,465

November 05, 2017, 05:39:35 PM
by peranders

QSXM3 build check

Started by goldkenn

Replies: 4
Views: 6,957

October 19, 2009, 07:51:43 PM
by goldkenn

QSXM3 Noise Floor Or Hum

Started by goldkenn

Replies: 9
Views: 11,377

August 18, 2010, 12:55:04 PM
by goldkenn

QSXM2: Start preparing!

Started by goldkenn

Replies: 6
Views: 8,394

October 25, 2009, 04:31:13 PM
by goldkenn

How To Change Gain For QSXM2 and QSXM3

Started by goldkenn

Replies: 6
Views: 11,348

March 07, 2011, 06:22:26 AM
by peranders

Question about QSXM2, regarding our email conversation

Started by goldkenn

Replies: 3
Views: 7,841

February 19, 2010, 01:22:34 PM
by peranders

I am confusing recently about transistor matching

Started by goldkenn

Replies: 1
Views: 8,662

March 11, 2011, 10:51:57 AM
by peranders

EMI filter MuRATA 10nF/100V Max 6A

Started by gipione

Replies: 3
Views: 9,346

March 16, 2013, 07:42:14 AM
by peranders

QSXM2 doubt

Started by gianluca

Replies: 6
Views: 9,596

October 28, 2009, 11:28:10 AM
by peranders