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

replies: 88 views: 123,816
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gyraf 26th July 2021
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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: 1,164 views: 564,693
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Gainlab Audio 20th May 2021
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DSP Innovations has recently launched a FREE data sheet search site. The site, Datasheetpro.com - Search Electronic Components ,...

replies: 19 views: 58,235
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msbettyhunt 27th March 2020
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Anyone who offers technical services should get themselves listed into the new member directory here... Gearspace Directory:...

Tim Farrant
replies: 9 views: 47,247
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msbettyhunt 24th March 2020
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Forward Hello fellow GS'ers! This is a reissue of a thread that I started over in the Cakewalk forums. It was immensely...

replies: 91 views: 30,112
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Rick Dalton 2 hours ago
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The left control room out is not working right . The meters are showing signal coming from the tape machine , and I do hear a...

replies: 10 views: 1,734
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Jim Williams 11 hours ago
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I'm getting this high freq beeping kind of noise (file attached) on brand new presonus speakers even with no audio cable plugged...

replies: 0 views: 57
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cinetj 15 hours ago
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has anyone had to repair the rubber mounting shocks in the base of a sony c37, or know if there is a replacement part available....

replies: 5 views: 983
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Thomas W. Bethe 17 hours ago
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Hi, I have a Rode Classic II which stopped working. I had 2 problems, one was that the cable on the microphone end was...

[email protected]
replies: 2 views: 584
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Moo 20 hours ago
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Hi all hope you’re well, So I have an AX84 P1 5 watt tube amp that I built. I’ve got a few other amps so I would like to...

replies: 2 views: 141
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Gonzbull 1 day ago
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Hi everyone! Recently I got scammed and bought a broken Vintech Dual 72 rack preamp. Worse than that it happened through a...

replies: 6 views: 277
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NathanEldred 1 day ago
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I don't know or cant figure out why this QSC HPR152i active loud speaker is doing what its doing. So when I opened it up I had...

replies: 22 views: 355
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Rick Dalton 1 day ago
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Hi, I guess this is where to post regarding this question. Does anyone here have a pinout diagram for the akg C34 and its s24...

replies: 0 views: 72
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headrc 1 day ago
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Hello..I posted this in another thread I guess it was the wrong one..Anyway, I'm having problems with my HEDD monitors and I'm...

replies: 3 views: 121
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Thomas W. Bethe 1 day ago
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Hi, I´m looking for a passive headphone volume attenuator with 3 set levels of volume: quiet, normal and loud. I can´t seem to...

replies: 0 views: 79
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bamsehopp 1 day ago
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Can an SS34 Schottky diode be connected in series between the power supply and the ground to prevent reverse connection? as the...

replies: 1 views: 103
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Philbo King 2 days ago
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Hey Geekonauts, I have a MOTU 828es - how do I determine the clip level for the A/D input converters? The reason I ask, is...

replies: 12 views: 399
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circusreturn 2 days ago
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Anyone here ever do that? I have seen peopIe change the sound of korg MiniIogue's for the better and I think I saw someone do it...

replies: 3 views: 121
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Analogue Mastering 3 days ago
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A buddy of mine needs to replace a VU meter in his Drawmer 1960. Drawmer wants $140 for one. Anyone know of a cheaper suitable...

replies: 2 views: 685
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CCorcoran 4 days ago
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Hi, does anyone have any experience or ideas regarding a Blue Bottle Rocket Stage 2 power supply, the red light turned to green...

replies: 16 views: 2,203
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sbou 4 days ago
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Hello All, I have a Akai DPS 16 that is new to me. When I turn it on it does not find the ATA drive. I have pulled the...

replies: 2 views: 150
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ruffrecords 4 days ago
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Picked up a used drawmer 1960. Not so stoked on the dull 1D sound of the pres but the compressor has some quality retro flavour...

Red Sky
replies: 18 views: 5,277
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tmarra 4 days ago
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Hi everyone! I have recently been tasked to bring our old dusty Ampex AG440B back to life. It's been quietly sitting in the...

replies: 15 views: 234
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Jim Williams 4 days ago
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I replaced my R0DE NTV Tube with an equivalent GrooveTubes 12AT7 tube. While replacing the tube, I spied 2 adjustable pots on...

replies: 20 views: 2,892
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Lemon Squeezer 4 days ago
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I have a Blue Bottle Rocket Stage 2 which comes with the Powerstream power supply. It employs a soft start feature to avoid...

replies: 3 views: 526
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Jsharpmusic 5 days ago
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Hello, If you run one small analog mixer into another (perhaps larger) analog mixer, is that about the same signal quality...

replies: 2 views: 183
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gearstudent 6 days ago
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A client of mine had it and did not want it anymore. It was made in the early 1950s or late 1940s. I have not turned it on but...

Thomas W. Bethe
replies: 8 views: 247
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kludgeaudio 1 week ago
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Hi everyone! I know this is a long shot, but would anyone have an idea why this is happening?! I have an older M80 with Jensen...

replies: 1 views: 108
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Thomas W. Bethe 1 week ago
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I'm putting together a direct recording studio in my apartment. I have four different tube guitar amp heads that I record with. ...

replies: 18 views: 14,761
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Gearnerd320 1 week ago
Avatar for WanderingScholar

Hello everyone, I recently got a DOD r-870 flanger/double. I believe Its mono in stereo out... however, channel B output just...

replies: 0 views: 99
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WanderingScholar 1 week ago
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Hi! I've been using my Tascam TSR8 for a good ten years now and as of last week i've noticed a significant difference in...

replies: 10 views: 1,575
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RetroFunk 1 week ago
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I am Looking for Schematics and any available Technical repair Info available on the Alesis Adat XT20. I have 2 of these with the...

replies: 12 views: 11,612
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claudem68 1 week ago
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Hello, I have microphone preamp power supply with the following pinout over a 10 pin ribbon cable: Pins 1,2 : +25v Pins...

replies: 10 views: 297
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trubadoor 1 week ago
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I have four xlr mic cables that I am using with AKG D3700 dynamic mics. Two of the cables work fine with phantom power enabled...

replies: 33 views: 22,457
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Arka Mitra 1 week ago
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Hi all, I currently run an Antelope Audio Orion 32 and MP32 which is basically just two units that run 32 channels of preamps...

replies: 8 views: 196
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MediaGary 1 week ago
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Hi there, I recently purchased a DBX 160A online. Upon plugging in the power supply (nothing connected to the 'Input' or...

replies: 17 views: 299
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ZRGuitarPickups 1 week ago
Avatar for The Dazzler

Hi, I'm a sadistic gear pig and I like to swim in $h!t and sink my teeth into hot garbage. I have spent the last month mastering...

The Dazzler
replies: 3 views: 231
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The Dazzler 1 week ago
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Hello, whenever I turn on phantom power, I get a hum around 50hz. I had this same problem a year ago and I was able to cure it by...

replies: 10 views: 234
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Jim Williams 1 week ago
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I've long thought that the AES/EBU digital cables would be quite good for not only digital interconnects, but also mic/line runs....

replies: 10 views: 6,784
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Jim Williams 1 week ago
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I have read several times that to use a higher slew rate opamp, it may be required to decouple it adding a capacitor connecting...

replies: 1 views: 176
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ripple_fx1 1 week ago
Avatar for Aaron W

Hi all, I'm trying to repair my Yamaha SPX90 (Mark 1) power supply. Besides recapping I have noted which other parts need...

Aaron W
replies: 15 views: 3,119
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Andrew Bacon 1 week ago
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My "April Air" air cleaner for my studio did not seem like it was working. The tech from the HVAC company came out and...

Thomas W. Bethe
replies: 19 views: 377
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Thomas W. Bethe 1 week ago
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I have a 32 channel mixer It turns on but no sound coming out. I plugged-in my synth output to each of the input channels and...

replies: 11 views: 11,833
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Thomas W. Bethe 1 week ago
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Hi folks, Please take a look at the attached pic. Could anyone tell me how pros create these labels for patchbays? I mean, the...

replies: 13 views: 465
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originalscottyg 2 weeks ago
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I have an FB-01 with pretty bad signal bleed when I assign different sounds to the Left and Right outputs. Makes tracking a bit...

replies: 3 views: 141
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Thomas W. Bethe 2 weeks ago
Avatar for John N

Hi, I recently bought a Sony R7 reverb. I was working upon arrival but had the 'low battery' warning and wouldn't hold anything...

John N
replies: 5 views: 212
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John N 2 weeks ago
Avatar for travis.farmer

i have acquired a free Leslie Model 110, and i was thinking of adding a plate amp, and an upgraded speaker. i have two ways i...

replies: 9 views: 304
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travis.farmer 2 weeks ago
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I'm bringing back to life an old Formant, powering it from a doepfer 12v PSU. The tracking on the VCO's is ok, and one of the...

replies: 2 views: 113
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rez 2 weeks ago
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People take the transformers out of sm57s and sm58s for studio use. How about my pg48 I have not used in forever? Possibly worth...

replies: 9 views: 3,575
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xbr 2 weeks ago
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I just bought an Aston Spirit, used from CeX. It was going for very cheap. The mic seems to work, it sounds pretty good. But if...

replies: 5 views: 259
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Barib110 2 weeks ago
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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: 17 views: 2,422
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Uby62 2 weeks ago
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I would be very grateful if someone might be able to help.I have searched the net,phoned yamaha electronics and parts companies...

replies: 6 views: 5,878
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Thomas W. Bethe 2 weeks ago
Avatar for FeverUSA

The Dynaco SCA-80Q 4-dimensional amp kit was considered high quality in the 70's. Can anyone suggest where a NOS (virgin/mint)...

replies: 3 views: 157
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Al Rogers 2 weeks ago
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I've just bought this Hifi spring reverb which ultimately needs a mod for it to work as a full stereo unit. The problem is that...

replies: 13 views: 10,737
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Radardoug 2 weeks ago