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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: 96,781
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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: 492,555
Avatar for chipss36
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: 46,354
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: 35,145
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: 43 views: 3,294
Avatar for Radardoug
Radardoug 41 minutes 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: 125 views: 24,387
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kenrinc 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: 130
Avatar for DrewE
DrewE 4 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: 933
Avatar for 2Low
2Low 4 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: 337
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becks bolero 6 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: 206
Avatar for tINY
tINY 6 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: 647
Avatar for Byron Pierce
Byron Pierce 6 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: 294,501
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: 11,619
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: 131
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: 701
Avatar for parpat
parpat 2 days 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: 606
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: 1,822
Avatar for Richard Crowley
Richard Crowley 3 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: 303
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: 1,097
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 5 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 5 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: 346
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: 1,383
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: 20,071
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: 562
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: 1,407
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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