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Avatar for MicroSonic

I have been collecting schematics for 30 years and 5 years ago I started make them available at my site but...

replies: 72 views: 96,772
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hebjam 30th August 2019
Avatar for Tim Farrant



OK, something to spice up Geekslutz = here is where we post images of the INSIDE of audio equipment. Disclaimer; any photo...

Tim Farrant
replies: 1,106 views: 492,535
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chipss36 29th August 2019
Avatar for gabriel1

DSP Innovations has recently launched a FREE data sheet search site. The site, - Search Electronic Components ,...

replies: 16 views: 46,351
Avatar for ponzi
ponzi 27th October 2017
Avatar for Tim Farrant

Anyone who offers technical services should get themselves listed into the new member directory here... Gearslutz Directory:...

Tim Farrant
replies: 8 views: 35,142
Avatar for Aniol1349
Aniol1349 10th June 2017
Avatar for muddbros

Hello, I have a CAD VSM-1 microphone that needs a new tube. Currently it has a Sovtek 12AX7WA. I was wondering if someone...

replies: 39 views: 3,261
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lame pseudonym 1 hour ago
Avatar for lame pseudonym

Today I took an IEC power cord apart, hoping to use the internal wires for a short bit of internal power wiring. It's power...

lame pseudonym
replies: 2 views: 106
Avatar for DrewE
DrewE 2 hours ago
Avatar for juniorexploder

Hi - I have a MCI JH110C-8 (1") -there are very small flat spots on the faces of the tape lifter rods (nothing drastic)...

replies: 7 views: 926
Avatar for 2Low
2Low 2 hours ago
Avatar for Slutty Professor

My Roland JX8P is noisy. Not noisy in a gargling, crackling kind of way, it just has a high background noisefloor all the time....

Slutty Professor
replies: 3 views: 332
Avatar for becks bolero
becks bolero 4 hours ago
Avatar for hohohoho

Hi, I've got a HiFi stereo preamp with two 12ax7 valves. Attaching the schematics (the schematics uses 12au7 as the second...

replies: 1 views: 203
Avatar for tINY
tINY 4 hours ago
Avatar for TheVillageIdiot

I just went to fire up my RED Audio Type A tube mic and when I plug the 7 pin cable into the mic body the light on the power...

replies: 4 views: 644
Avatar for Byron Pierce
Byron Pierce 4 hours ago
Avatar for recordinghopkins

Tonight the 17v +/- lights went out on my power supply. I have yet to remove it from the rack, but I was curious to see if anyone...

replies: 124 views: 24,357
Avatar for kenrinc
kenrinc 16 hours ago
Avatar for Chagalj

There has been alot of talk about importance of conversion in recording chain, and lots of people want to know which AD/DA chip...

replies: 441 views: 294,476
Avatar for Giro1991
Giro1991 1 day ago
Avatar for 5.333V

i bought an old psu for my soundcraft dlx delta some months ago. it has been working fine until the other day when i couldnt get...

replies: 91 views: 11,617
Avatar for Jim Williams
Jim Williams 1 day ago
Avatar for Old Goat

I'm not able to find a schematic for this. Does anyone know if this is a starved plate design? I had my VLA modded to full...

Old Goat
replies: 11 views: 4,103
Avatar for JimmyT
JimmyT 1 day ago
Avatar for LittleDev

I have managed to track down the manual and a service manual for the 224x, but it is lacking a schematic for the NVS...

replies: 2 views: 550
Avatar for justanalogue
justanalogue 1 day ago
Avatar for sin night

Hello, I just finished a few mods on my Korg MS-20 Mini. There are already some resources online showing how to add...

sin night
replies: 0 views: 129
Avatar for sin night
sin night 1 day ago
Avatar for Transmutant

Mixer mod


Hi I have a Soundtracs 32/4/2 mixer, not used at the moment but still a good unit. Just feel it's a bit lifeless... I'm going to...

replies: 62 views: 2,093
Avatar for Transmutant
Transmutant 1 day ago
Avatar for parpat

the capstan motor on my Otari locked up, when I opened the motor casing, a small plastic piece fell out, motor spins fine, that...

replies: 4 views: 700
Avatar for parpat
parpat 1 day ago
Avatar for lpww

Hey! I'm having trouble with interference that I think is coming from the mains. The noise is a high pitched whine that sounds...

replies: 17 views: 605
Avatar for samwinston123
samwinston123 2 days ago
Avatar for jerry123

I need a 3.5mm to bare wire. Bought a 3.5mm to rca and clipped the ends but I found there are 2 wires plus a shield. Wires are...

replies: 4 views: 195
Avatar for jerry123
jerry123 2 days ago
Avatar for jvancorduroy

I am restoring my Auditronics 26 channel Son of 36 Grant console. I have seen many posts suggesting a replacement of the power...

replies: 4 views: 229
Avatar for Jim Williams
Jim Williams 2 days ago
Avatar for LukeAndListen

Hi ! I'm going to unite a bunch of Bose satelite speakers to make a poor man's L1..... I opened up the se-5 speaker and found...

replies: 33 views: 1,821
Avatar for Richard Crowley
Richard Crowley 2 days ago
Avatar for mick61

I just got two Orban tanks the other day and I'm wondering how to wire one of them up to my driver( tank driver from Radial). I...

replies: 3 views: 302
Avatar for Jim Williams
Jim Williams 3 days ago
Avatar for Minilove

Hi i am not technical wizard but I can solder :) can anyone do me a favour and point me in the right direction for a replacement...

replies: 5 views: 304
Avatar for Jim Williams
Jim Williams 3 days ago
Avatar for Byron

Hi all, I have an NPNG DMP-2NW that needs a (hopefully minor) repair. The problem is no signal on channel 1. No action on...

replies: 1 views: 476
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Byron 3 days ago
Avatar for btmohler

I've got a Yamaha SPX 1000 open on the work bench that came to me with "Warning Data Error" upon boot. It passes...

replies: 1 views: 329
Avatar for btmohler
btmohler 3 days ago
Avatar for dannykorrson

man it hurts typing this out; I was playing my cs50 recently when I suddenly heard a soft pop and noticed afterwards only 3/4...

replies: 3 views: 632
Avatar for yesman
yesman 3 days ago
Avatar for Buddspencer

Hello, This is my first post on GS, although I've been lurking since my teenage. My TR-808 is giving me a headache. After...

replies: 0 views: 275
Avatar for Buddspencer
Buddspencer 4 days ago
Avatar for sat159p1

Can you recommend me the best tube to use with spl mk2-t vitalizer? Unit has stock Sovtek 12AX7LPS tubes (one operating in stereo...

replies: 12 views: 3,467
Avatar for work
work 4 days ago
Avatar for CraigF

Can anyone provide a copy of the Yamaha diagnostic software (or a link) for the M7CL? I see the references in the service manual...

replies: 0 views: 281
Avatar for CraigF
CraigF 4 days ago
Avatar for Uli Auer

Hey everybody, I'm thinking about building / developing a MCU-based hardware controller for plugins. Does anybody know whether...

Uli Auer
replies: 5 views: 1,095
Avatar for Uli Auer
Uli Auer 4 days ago
Avatar for compo

Hello, I'm getting a very strange intermittent problem with my TLA "Ivory 2" 5051, which is ruining some recordings...

replies: 14 views: 1,621
Avatar for Radardoug
Radardoug 4 days ago
Avatar for ryandfaris

I have a vintage Tesla channel strip that I've recapped the EQ section, and have fixed up the PSU on. It's now receiving a...

replies: 0 views: 291
Avatar for ryandfaris
ryandfaris 4 days ago
Avatar for Shak

Hi Folks does anyone have a schematic for a Furman LC3. I would like to add the balance circuit and not sure what the deal is...

replies: 7 views: 944
Avatar for soundshots
soundshots 4 days ago
Avatar for ryanisprism

Hey all, I just bought a piece of vintage test equipment (Leeds and Northrup 5430) with some cool knobs and faceplate. I was...

replies: 0 views: 321
Avatar for ryanisprism
ryanisprism 5 days ago
Avatar for okkokkokko

Welcome to exactly what the title of this thread suggests! And let me go straight to the disclaimer for all you millennial-,...

replies: 40 views: 3,688
Avatar for crosscutred
crosscutred 5 days ago
Avatar for Chris Parsons

Hello, What could I do to my DBX 386 to make it sound less "consumer"? I figure I can change the 12AU7 tubes to...

Chris Parsons
replies: 20 views: 7,024
Avatar for indigenous
indigenous 5 days ago
Avatar for ryandfaris

I'm fixing up a Tesla EJU 124 channel strip I got for next to nothing. Got it working just "fine" but it's got real low...

replies: 7 views: 465
Avatar for ryandfaris
ryandfaris 5 days ago
Avatar for gkmaia

I am fixing a M-Audio Prokeys 88SX which has a faulty main board. Anyone here with a faulty Prokeys 88SX and may want to get...

replies: 0 views: 345
Avatar for gkmaia
gkmaia 6 days ago
Avatar for gearstudent

Hello, I believe cardioid takes two signals and does something with the phase to produce the cardioid pattern. Is it...

replies: 3 views: 440
Avatar for gearstudent
gearstudent 6 days ago
Avatar for les24preludes

Assuming I don't get an existing MK219 or 319, I'm wondering about building the circuit from scratch using something like a...

replies: 3 views: 362
Avatar for Lumbergh
Lumbergh 6 days ago
Avatar for whatever17

Having a look at the Midi Implementation (p.234 onwards) with a vague view to having some remote access to some parameters...

replies: 1 views: 329
Avatar for whatever17
whatever17 6 days ago
Avatar for LoFizle

Can I swap the akai MPC60’s IC, PCM54HP 16-bit D/A converter, with a 8-bit d/a converter. Like if I wanted the MPC60 to be...

replies: 3 views: 447
Avatar for acreil
acreil 1 week ago
Avatar for trubadoor

Hello, I'm very new to using a soldering iron, but I've soldered a few hundred cable connectors so far and put together a...

replies: 36 views: 2,768
Avatar for committments
committments 1 week ago
Avatar for lotech

I hadn't used my gear in 5 years after quitting gigging and closing my project studio, but I kept it and have recently started...

replies: 1 views: 1,381
Avatar for lmerck
lmerck 1 week ago
Avatar for illacov

Some time ago I read on Tape Op where Jim Williams spoke about modding his Tascam 38 by doing some various mods to the cards that...

replies: 55 views: 20,069
Avatar for Brian M. Boykin
Brian M. Boykin 1 week ago
Avatar for Outlaw Hans

Has anyone ever heard of refurbishing worn faders? I have P&G conductive plastic faders in my MCI 400 console. I like them...

Outlaw Hans
replies: 14 views: 3,172
Avatar for EvLoutonian
EvLoutonian 1 week ago
Avatar for Yoski

Hello! I have a little problem with my Otari MX7000. It‘s a 2 track 1/4“ tape machine. It has 3x tape speeds: 15, 7 ½ and 3...

replies: 2 views: 1,154
Avatar for Bill Way
Bill Way 1 week ago
Avatar for Uli Auer

Hey everybody ! I'm searching for schematics of the API 550B(!) Equalizer module. I'd like to change the boost/cut gain on...

Uli Auer
replies: 0 views: 451
Avatar for Uli Auer
Uli Auer 1 week ago
Avatar for Rob Coates

I've got an old Dukane comp on the way. I'd like to move the switches on the back to the front. I can use a soldering iron but...

Rob Coates
replies: 2 views: 457
Avatar for Brian M. Boykin
Brian M. Boykin 1 week ago
Avatar for kenrinc

I've been searching around through all the Soundcraft posts looking for info on pots for the Sapphyre but haven't had too much...

replies: 1 views: 1,151
Avatar for kenrinc
kenrinc 1 week ago
Avatar for ljefe

Hello smart people, I know zero about electronics. I have a Strymon Deco pedal that I had modified, I had a mono/stereo...

replies: 2 views: 558
Avatar for ljefe
ljefe 1 week ago
Avatar for sameal

So i read that you can decouple an opamp from the power rails with a small ceramic cap from + and minus to ground. Then i...

replies: 27 views: 1,402
Avatar for Jim Williams
Jim Williams 1 week ago
Avatar for Patrick Dexter

Hi there! My 808 problem is that after switching it on it doesn't work the first 2-3 minutes. - "Basic Variation" and...

Patrick Dexter
replies: 4 views: 2,328
Avatar for Buddspencer
Buddspencer 1 week ago


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