Analoguediehard Workbench - Repair History

Updated 06/14/2026

I earned a BTEE with emphasis in microprocessor systems and post graduate study in software, I have repaired/maintained my own music gear since the 1980s, and I do a lot of research on components, circuits, and designs. I have amassed a good library of schematics and references. Below is the scope of work that I have done:

SCOPE OF INSTRUMENTS
Included	Not Included
Specialty: vintage analog/hybrid synthesizers, modular/polyphonic/monophonic vintage analog/hybrid audio processors Any modern analog synth or effect using through hole components (not SMT) String machines (within limits) Digital Reverbs (within limits) Non-subtractive synths (within limits)	Warranty repairs. I am not certified with any OEM. With few exceptions, any product made after 1990 (email for inquiries) Electric pianos, digital pianos, combo organs, Hammond organs, Leslie speakers Drum machines Any lethal high voltage device (IE power amps, vacuum tube guitar amps) Samplers operated from floppy disks Any tape transport systems Heavy and/or large format devices IE mixing consoles Any device with: no schematics available wire wrapped circuits component markings sanded off or painted over
SCOPE OF WORK
Included	Not included
Repairs Restoration (electronic) Calibration Through Hole Technology (THT) components Key bushing replacements for Pratt-Read keybeds Installation of 3^rd party additions, IE MIDI retrofits Customizations Subject to availability of replacement or substitute components.	Cosmetic restorations Metal work or fabrication PC board fabrication "Circuit bent" projects DIY projects (esp modulars) Damage from: excessive rust excessive moisture/ocean salt excessive battery acid leakage blunt impact or fall rodent urine/excrement Any device with: encapsulated or epoxy potted circuit modules with no substitutes switching power supplies Surface Mount Technology (SMT) components

I do not work on high voltage gear such as power amps and vacuum tube guitar amps. I am not trained to work around lethal voltages, and since I live alone it is unwise to risk serious injury from electrical shock with no help close by.

I do not work on any circuits with surface mount technology (SMT) components. This rules out almost everything made after 1990. I do not own any tools for SMT devices, the devices cannot be identified without a schematic (which are generally not available), and my eyesight is not as good as it used to be. Sadly, circuit boards made with SMT are disposable if they break as there are precious few repair shops with the tools and knowledge to work on them. Defective parts must be physically the same size and footprint as the original - if you can still acquire them, as technology advances so fast that components go obsolete too quickly. 100% SMT circuit boards are essentially unserviceable - even in certified service centers, where a warranty repair is a complete circuit board swap. This is more expensive, but SMT repairs are no longer done at the component level.

On the other face of the argument, THT components are rapidly being phased out by OEMs. Many IC types are still available in SMT formats which require an adapter board. One component that is now harder to find are large axial lead electrolytic capacitors. The market for THT components is volatile and changes daily.

"Within limits" refers to

Whether I have the tools for the job. Example: complex circuits such as digital reverbs require a signature analyzer, those tools are long obsolete and I do not own one.
Substitute components will not work. Some synthesizer circuits use logic components from an older obsolete TTL family where newer substitutes will not work.
The level of difficulty in disassembly. Example: point-to-point assembled circuit boards with zero interconnects, ICs soldered in without sockets, keyboards/circuit boards secured to front panel and not to the base.
The complexity of the malfunction. Discrete computers such as digital reverbs use a maze of logic components. Multiple failed components can complicate the repair process and increase the repair cost. Not impossible, but the repair bill may be higher.

Not currently accepting customer repairs but that could change.

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