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

replies: 91 views: 142,442
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jokeramik 3 days ago
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OK, something to spice up GeekZone = here is where we post images of the INSIDE of audio equipment. Disclaimer; any photo...

Tim Farrant
replies: 1,169 views: 602,500
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Rtroost 25th July 2022
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Anyone who offers technical services should get themselves listed into the new member directory here... Gearspace Directory:...

Tim Farrant
replies: 11 views: 57,077
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play/record 26th June 2022
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DSP Innovations has recently launched a FREE data sheet search site. The site, - Search Electronic Components ,...

replies: 19 views: 68,007
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msbettyhunt 27th March 2020
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Hey All - exactly as stated in the thread title - I bought a Matrix 1000 and the seller "forgot" to put in the...

replies: 12 views: 2,129
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JohnTyler 8 hours ago
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dear Geekslutz, I accidently fried a Matrix-1000 that was configured for 120 volt by plugging it into 220 volt - :facepalm:...

replies: 10 views: 2,020
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JohnTyler 9 hours ago
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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: 120 views: 16,251
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Monotremata 12 hours ago
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Hello, I am having some issues with my Focusrite 430 MKii Producer Pack. The Trim knob no longer has any effect, there's a bit...

replies: 9 views: 191
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chriscaldwell11 1 day ago
Avatar for Aaargh

Hi, I've just purchased a second hand ULN-2 3D for a fair price. Now i've got my old ULN-2D that i'm no longer going to use....

replies: 2 views: 113
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Aaargh 1 day ago
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so I got this yamaha PM 700 pretty cheap its my understanding they are very similar to the PM 1000 I was actually thing of...

replies: 7 views: 5,824
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rjb5191 1 day ago
Avatar for Dainofmaine

Hey there hive mind, I have a Sennheiser MD421 U 5 That was working one day and now it is completely not producing any sound...

replies: 0 views: 37
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Dainofmaine 2 days ago
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Hi all I'm hoping someone can help me diagnose an issue with my monitors. I have a pair of SE Munro Egg150s, bought...

replies: 57 views: 9,591
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geolang 2 days ago
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Hello, I'm trying to figure out what could cause the noise I hear when operating this unit on manual attack/release mode....

replies: 1 views: 336
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zMic 2 days ago
Avatar for 3minute Tantra

Hello, I ve got a pair of great sounding 1:1 room isolation transformers out of an old East German radio station. They look...

3minute Tantra
replies: 2 views: 69
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3minute Tantra 2 days ago
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Hello, a lot of people have difficulties to connect their RFZ units (V781, V741, V740 and so on) or units from VEB Funkwerk...

replies: 0 views: 46
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jokeramik 3 days ago
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This question relates to the attached diagram I made. I understand how the RC High pass filter at the top works. The...

replies: 1 views: 59
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samwinston123 3 days ago
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Hi, if you need some informationes or schematics about amplifiers and other gear from the "Rundfunk- und...

replies: 5 views: 528
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jokeramik 3 days ago
Avatar for smnmusik

My oberheim Matrix-12 could use some new rotary encoders. Does anyone know where to look for this?? Thank You

replies: 8 views: 1,958
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AuldLangSine 4 days ago
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Alright. First post so please feel free to give feedback. I’m looking to either build or buy a monitor controller. I feel...

replies: 3 views: 103
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Kidsdwgh 4 days ago
Avatar for Thomas W. Bethe

The local college used to have some students in their physics department who were interested in learning about audio electronics....

Thomas W. Bethe
replies: 33 views: 605
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RayHeath 4 days ago
Avatar for minanapil13

hallo i replaced all the filter capacitors in my SE4400a and still get this noise can any one help me plz cable changed and...

replies: 1 views: 118
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ANVM 5 days ago
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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: 582 views: 420,098
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DAH 5 days ago
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Hi everyone, Apparently one of my Adam monitors just stopped working from a moment to another. I have a few doubts for the...

replies: 12 views: 6,109
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makasi 5 days ago
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Hi Guys, I hope there is someone who can help me :) I have tried to repair both my KRK Rokit 5 RP2 speakers. What I have...

replies: 1 views: 71
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Johnny T 5 days ago
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I brought my Mac (OS X El Capitan) to the Best Buy Geek Squad today and they weren’t able to figure out the issue either....

The Gentleman
replies: 0 views: 55
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The Gentleman 6 days ago
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Can any standard 16x2 screen be used with an old Ultraproteus? The original screen seems to be on its way out. I checked the...

replies: 2 views: 578
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The Dazzler 6 days ago
Avatar for Bramley

I have a Tascam DA30 machine, on loading a tape the open/close button keeps flashing then the tape ejects. Any hints on where to...

replies: 4 views: 129
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Bramley 6 days ago
Avatar for UpperLeft

Hi there, I am a long time reader, now a first time poster - here we go: I have got a Eventide H3500 DFX with the right...

replies: 9 views: 1,323
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Spindrift 6 days ago
Avatar for VT-MHE

I have an issue with one of the woofers on my event opals. depending on the type of low end frequency you hear an audible...

replies: 4 views: 82
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VT-MHE 1 week ago
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Just out of curiosity I thought I'd ask here if anyone's done a sidechain mod to the Electro-Harmonix Platform? I'm staring at...

replies: 0 views: 45
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Bonsaipanda 1 week ago
Avatar for Shlomi.stern

Hi. Do you have better idea? I am a gear desing. :facepalm:

replies: 0 views: 75
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Shlomi.stern 1 week ago
Avatar for Gus_Pin

I found this Siemens/telefunken(?) module labled ”Hb 50 nr 7” I cant find any info about it online, so i wonder if someone...

replies: 2 views: 142
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gyraf 1 week ago
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Hi Guys, I'm repairing an EMT248 at the moment, the power supply went high and took out a load of chips. Does...

replies: 24 views: 5,565
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Areft 1 week ago
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Somehow I had completely forgotten about the existence of the E-Series Signature Channel that SSL released as part of their...

replies: 2 views: 215
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midnightsun 1 week ago
Avatar for drshakamoto

Hi there, My one of my Adams T5v's is not turning on. I assuming its due to a blown fuse, but I can't figure out where inside...

replies: 0 views: 54
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drshakamoto 1 week ago
Avatar for robmendoz3

Hi everyone. I recently bought a Juno 106 from ebay. I noticed that there was some crackling sounds after I played the keyboard...

replies: 8 views: 6,817
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focusclear 1 week ago
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Dose anyone have one ????? Need some info please . Thanks G

replies: 8 views: 11,290
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play.exe 1 week ago
Avatar for plutoniq

I’m in the process of restoring my 2nd Yamaha CS-70M for an acquaintance, really going to town on this one as I’m hanging up...

replies: 1 views: 76
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plutoniq 1 week ago
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Hi all, so there is a lot of stuff around here on DIY audio gear, and many conversations occured like 6-7 years ago. So I think...

replies: 6 views: 9,270
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FreakinPavel 1 week ago
Avatar for Uby62

Hi everyone! I need to repair a Ddrum AT module : the trigger inputs are not working and i have distortion on outputs, and the...

replies: 20 views: 2,656
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Johnny T 1 week ago
Avatar for althemusicwizard

I have a Tascam RC-88 I am selling and a guy wants to know if it will work with the TSR8. The RC88 is the dedicated remote for...

replies: 7 views: 387
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Zipp0 1 week ago
Avatar for Duane0270

Hello . I am trying to source detented potentiometers. Namely 41 clicks , 100k dual gang 16 mm type. Does anyone know of any...

replies: 1 views: 94
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Thomas W. Bethe 1 week ago
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I made a few things in 2021, but I've got a backlog of kits and projects to build this year: Pair of Matador/Chunger C12...

replies: 43 views: 2,803
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Thomas W. Bethe 1 week ago
Avatar for cmackenz

Hi, Probably a long shot, but I'm looking for the service manual and/or schematic for the original JBL 7510 (not the 7510A or...

replies: 3 views: 132
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cmackenz 1 week ago
Avatar for starfield

so to make a long story short I came upon an old arp solina (first version) a while back and failed to open it up and check it...

replies: 30 views: 5,560
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Lamster 1 week ago
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Hello. Does anyone have tech manual for this console? I know that audiomaintenance is selling full manual. But it's real pain...

replies: 13 views: 7,310
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Rodv 1 week ago
Avatar for focusbob

Hi, I knowingly bought an "untested" DBX 160x compressor that happens to not work properly, and I would like to fix it....

replies: 2 views: 93
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focusbob 2 weeks ago
Avatar for arbor

Hi all, My SPX90 (Mk I) stopped working. I've replaced all electrolytic caps and a couple of resistors. I've scraped all...

replies: 79 views: 1,625
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arbor 2 weeks ago
Avatar for Aniol1349

Hello! I'm looking for pre amp schematics for the MCI 500D series console. I have the channel strip schematics however the...

replies: 13 views: 4,655
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Clomi 2 weeks ago
Avatar for johannburkard

I've had a project on the desk ("bench") for a while now where I'm trying to build cheap class D chips amps into 9V...

replies: 2 views: 92
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johannburkard 2 weeks ago
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Recently a user pm'd me about specifics regarding the midas venice 1st gen console, so I thought I'd share my current project as...

replies: 31 views: 1,931
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NeonCQ 2 weeks ago
Avatar for Riccardo

Anybody around here with info or advice, infinite wisdom or contacts for somebody capable of helping us fixing our Tore Seem...

replies: 21 views: 8,900
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akem 2 weeks ago
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Hello when I rented my studio 10 years ago I got this SEEM audio broadcast console included. i wonder if anybody in germany(...
replies: 8 views: 9,465
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akem 2 weeks ago
Avatar for defunkmike

So my beloved Audient ASP800 died the other day. Worked fine last session, now it has no power. The fuse was blown and as soon as...

replies: 5 views: 1,191
Avatar for Fuzby
Fuzby 2 weeks ago