Repairs | Modifications

Restorations | Customizations

Vintage Stage Electronics - Repairs & Modifications, Customizing & Occasions - in Berlin-Friedrichshain since 1990

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Overview Hammond Leslie Wurlitzer Hohner Rhodes Walter Woods AKG BX 20 Hotfixes Schematic Service Special Manufacturing Prof. Device Cleaning Occasions Shop Rare Spares Shop Electronic Dev's Shop References Contact

Circuit Design

You might need a device or functionality which is no longer available, or not yet.

An increasing experience in audio design since 1975

brings custmized solutions within your reach.

Schematics Design

You might have a schematic,

hand drawn, or with many corrections, or hardly readable.

Or you may have a damaged, faulty or destroyed PCB.

You might want a better readable and editable schematic, and maybe a corrected annotation.

I will design an easily and logically readable, originally or frehsly annotated schematic,

which can then be printed out in multicolor for service or development.

A PCB Layout can be the next step.

Layout Design

I will design layout files from delivered schematic and device footprints,

ready to be submitted to PCB manufacturers all around the globe.

Prototypes or series, PCBs can be made and even populated.

The following layout formats and drilling files can be delivered:

Gerber (Gerber is accepted worldwide), DXF, HGPL, Postscript.

Working in KiCAD I have designed

my own device symbols and footprint files

for audio specific devices in classic german design.

Available on request.

Small donation (light effort, or partial schematics)

HiFi Power Amp "Musical Fidelity P-170"

PA Power Amp "rr-electronic 200W"

SMPS „Chevin A-1000 Oscillator“

Bass Amp "D'Avalon YSEULT"

Tube DI Box "Ampeg SVTDI"

GDR Power Amp „rr 200W-Verstärker“

GDR Power Amp „A300“

Active Monitor „KRK Rokit 5“ (partial schematic Limiter)

LAB Ground Loop Filter

Martin Detonator (partial schematic Mod ARB Drumpad Trigger)

Samsung SyncMaster 21-Zoll-14V/8A-SMPS-Hi-Eff-SMPS (partial schematic)

HiFi Amp Technics SU-VX800 (partial schematic Volume / EQ)

VOX AC 30 (3 partial schematics Mods ARB Top Boost + Sat)

YAMAHA PS15M (partial schematic Limiter)

Inquiry Inquiry Inquiry

Refreshing donation

(considerable effort, or big size, or nowhere else to be had, additional documentation like hotfixes)

quad/eight electronics Mixing console „Coronado“

Input / Master Input Module 7400 / 7400M

[PCBs 7410-08 (Main),7210-06 (EQ), 7410-04 (QUAD PAN), 7410-10 (BUS 17-24 Switch)]

Echo Module 7400E

[PCBs 7410-08 (Main),7210-06 (EQ), 7410-04 (QUAD PAN), 7410-10 (BUS 17-24 Switch)]

Quad Module 7400QR [PCB 7870(Main)]

Control Room Module 7400CR [PCBs 7440 (Main) + 7840 (2nd Fader Amp)]

Studio Module 7400S [PCBs 7440 (Main) + 7840 (2nd Fader Amp)]

Communication Module 7400C [PCBs: ToDo + 7840 (2nd Fader Amp)]

Coronado Repair Harness

Rhodes Stage Piano "Mark 7 Seventy Three AM"

1 Part: Audio complete, without external PSU/MIDI/Display

Exhausting fault analysis and all ARB hotfixes !

Bass Amp "Walter Woods MI 100-8"

Part 1: SMPS | Part 2 (redrawn): Single Channel Pre Amp+Power Amp | Parts available separately

Bass Amp "Walter Woods MI 225-8"

Part 1: SMPS | Part 2: Dual Channel Pre Amp | Part 3: Class D Power Amp | Parts available separately

Bass Amp "David Eden WT-800" (redrawn and corrected)

assumed to cover all WT-subversions: WT-300 (?), WT-400(?), WT-500, WT-550(?), WT-600

Part 1: Preamp | Part 2: Power Amp+PSU | Parts available separately

Bass Amp "Bugera BVV3000 Infinium" Update incl. Disassembly procedure /„C75 exploded“ Fix incl. Analysis !

4 parts in 1: Mains Input PCB, PSU PCB, Driver PCB, Power Amp PCB

LAB XLR 4CH Unbalancer/Preamp/Bridge driver/Protection (in progress)

SONY STR-DH100 (partial schematic Power Amp + Controls)

SONY STR-DH130 (partial schematic Power Amp + Controls)

60Hz-sine-wave-MOSFET-Mains converter for US-HAMMOND Organs "Wand5"

Звуковой микшер ЛОМО КМ1 (Модуль ввода КМ1.00 и КМ1.000 версия PCB KM1.050)

Audio Mixer LOMO KM1 (Input Module KM1.00 / KM1.000 PCB Version KM1.050

Inquiry

Rare Schematics

Coloured .pdf, on request !

Beautifully readable, drawn in KiCAD from original PCBs or redrawn, will be extended!

1.-€ Stuff

(Reworked schematics, light effort, partial schematics

or stuff already known, but was cumbersome to read, giveaways, or tiny parts)

Baß-Amp „Acoustic 370“ Mod LAB (partial schematic Mod ARB Speaker Protection)

PA Power Amp "Zeck DCA501"

Lamellophon „Hohner Guitaret“

Lamellophon „Weltmeister Bassett“

GDR Organ „Vermona ET3“ (partial schematic PSU Version NT5)

ATX-PSU „Enermax EG301AX-VE G“ partial schematic

PA-Endstufe (100V) „Australian Monitor AMIS1202P“ partial schematic

Monitor speaker „B&W CM1“

GDR Power Amplifier „rfe 100W-Verstärker“

Cable dimmer „Relco RT88PS“

Duesenberg „Motown Bass“

Mario Schütz 5-Saiter Bass Bartolini Soap Bars + TC5

Ibanez Jazz Bas Mod ARB (JJJ Bridge Humbucker)

Loop-Sampler „Electrix TFR0035“ (partial schematic PSU-Pinout)

Orgel „Eminent Organ DCS 370“ (partial schematic Power Amp)

EMT A111 partial schematic

Acoustic Amp „Fishman Loudbox Mini“ (partial schematic for Mod ARB)

Gitarren-Amp „Framus Dragon“ (partial schematic Mod Finkhäuser)

HAMMOND L-100 (partial schematic Line Out Mod ARB)

HAMMOND M-100 (partial schematic Line Out Mod ARB)

HAMMOND PR-40 (partial schematic Mod ARB

HAMMOND Suzuki Leslie Speed Switch CU-1

LAB Audio Intermediate Amp

Carver PM-1.5A (partial schematic Mod LAB Thermo Fan Control)

LM3886-Aktivbox (partial schematic Mod ARB Separate MUTE)

miniKORG-700S (partial schematic PSU-IC)

Music Man Sixty-Five (partial schematic)

Rev Supra-Line 1470 Master-Slave Mains Distribution

Rhodes 88 Suitcase (partial schematic Preamp Pinouts)

Roland Space Echo RE-201 (partial schematic)

Ross Mixer RCS 802 (partial schematic Bus Pinout)

SMPS Energiesparlampe testronic 15W

Suprem (partial schematic Mod ARB no FB)

Siemens Room Heater OT2850

YAMAHA P4050 Power Amp (partial schematic)

YAMAHA pf30 (partial schematic DAC)

Mid-size donation (medium effort, usefully commented)

PA-Verstärker "Audio Labor Pa 2" (3 versions: Prototype 300W, Mod ARB 300W->400W, final version 400W

4-CH-PA-Amplifier "Harmonic Design QA-4"

Electro Piano "Manthey Stereo-Piano"

Electro Piano "Wurlitzer Piano EP 201“

Electro Piano "Wurlitzer Piano EP 300"

Mixer channel „Electrodyne 709L“

incl. innards A1000 (custom part of Electrodyne 709L !

HAMMOND 60Hz square mains generator G.Kraus

HAMMOND 60Hz square mains generator Rupp

LAB HAMMOND Universal Connection Panel

Leslie 122XB (partial schematic Audio)

Leslie Combo Preamp I (ARB)

Leslie Combo Preamp I (G.Kraus)

Leslie Combo Preamp I (G.Kraus) Mod ARB 2012

Trek II UC-1A

MA Subwoofer Amp

Manthey Stereo-Piano 1973

Manthey Stereo-Piano 1976

Reußenzehn Organ Groove

SMPS Skynet SNP-9034 (Dynacord DCS802)

Teufel M11000 (partial schematic PSU, Limiter + Controls)

thomann the t.amp PM40C

VASE Trendsetter 60 (1969)

VASE Trendsetter 60 (1969) Mod ARB

VASE Trendsetter 60 (Reissue)

VW Golf III Car In-door Dual Channel Amplifier Isophon

Wurlitzer Piano Model 200

Wurlitzer Piano Model 200 early DPC H-L (1968)

Wurlitzer Piano Model 200 early DPC H-M (1969)

Wurlitzer Piano Model 200A

Wurlitzer Piano Model EP201 (produced in Hüllhorst, Germany under license from Wurlitzer USA, close to US Model 200)

Wurlitzer Piano Model EP300 (produced in Hüllhorst, Germany under license from Wurlitzer USA

Can be seen as a EP201 in an upright piano enclosure

4-CH PA-Amplifier "YAMAHA P4050" (partial schematic SMPS only)