Second Order Harmonics

Second Order Harmonics Design, Customization, Repair & Improvement! secondorderharmonics.eu

Analogue Sound for the Digital Age: Handcrafted, artisanal analog audio exquisites – fresh designs to modded clones of only the very best consoles[/parts] from the 50ies » late 80ies.

Llimited time special offer for 2x 10 Slot Fredenstein 10S 500 Series Chassis from for 800EUR excl. Tax/Shipping. Used, ...
01/02/2026

Llimited time special offer for 2x 10 Slot Fredenstein 10S 500 Series Chassis from for 800EUR excl. Tax/Shipping. Used, in working condition.

10% off if you order via our website instead of eBay or Reverb.

2x Fredenstein Bento 10S 10-Slot Chassis (500 Series) | Musikinstrumente, Pro-Audio Equipment, Signalprozessoren & Effekte | eBay!

when is the last time you've seen this in a service manual for a mixing desk? this is why we love old consoles -- the EQ...
31/01/2026

when is the last time you've seen this in a service manual for a mixing desk? this is why we love old consoles -- the EQ frequency ranges and curves are described by TEAC like this (classical orchestra sections, human voice, synths and a elementary music theory like keys/octaves included). this is excellent!

XQP/DIYRE Colour-upter optical disruptor colour module
31/01/2026

XQP/DIYRE Colour-upter optical disruptor colour module

Building another colour module from DIYRE: JFT Class A JFET Colour
31/01/2026

Building another colour module from DIYRE: JFT Class A JFET Colour

We're starting to offer retrofits for analog audio hardware (mostly studio, but also synth, drum machines etc): MIDI ove...
31/01/2026

We're starting to offer retrofits for analog audio hardware (mostly studio, but also synth, drum machines etc): MIDI over Ethernet and Bluetooth for remote control from your DAW, tablet/iPad or smart phone. These use tiny microcontrollers interacting with control voltage (CV) or specific parts of circuits for example in a studio equalizer you could change resistance of a switched k**b thereby remotely controlling the position without having to turn anything on a unit that may be further away/outboard in a rack. This also adds easy recall via MIDI. get in touch with us for details about specific products you may want to retrofit and if it's possible on a given unit/price of the HW upgrade. MIDI because it works for 98% of use cases and is universally supported, lots of MIDI routers, hubs and MPE now also widely available due to DAWs. Of course you would also be able to pair or directly connect any MIDI controller you prefer. For older units or such that only support classic MIDI cables we can fit new MIDI in/out & through on most mentioned hardware but please don't hesitate to ask in detail!

https://secondorderharmonics.com/all_posts.html

We currently have a lot of studio and production gear to sell at the moment! We need to make space for new projects, get...
12/01/2026

We currently have a lot of studio and production gear to sell at the moment! We need to make space for new projects, get a bigger R&D budget for upcoming projects on the side and thought about selling most of these units for a while now (if they weren't already up on local platforms for some time like the 500 chassis), and now put everything we want to part ways with at the moment - even if it hurts a bit - on the relevant platforms.

For sale:
=======

*) ASM Hydrasynth Desktop in almost new condition
*) Eylsia Karacter 500 Series Stereo Saturator with original packaging, used only twice in a rack, like new.
*) 2x Fredenstein Bento 10S Chassis for 500 Series: 10-Slot Chassis with internal PSU. One with studio labeling stickers on it (easily removed), one with some rack burn from a touring case on the front panel (which made some of the LED writing less intelligable but works fine) - both cleaned, tested. One used to be rented out, the other one used to be one of our personal testing units and is in very good condition.

>> All hardware had been previously stored in a temperature and humidity controlled high-security storage unit with constant online climate monitoring, fire alarm etc. in rugged, shock-absorbant flight cases or in small non-smoking home to mid-sized studios or recording sessions of friends (where rental gear is concerned) as well as our R&D workplace at times depending on the unit in question: please just ask us directly if you have any questions or want to inquire about details about a certain device via [email protected]

Love having to hack a virtual COM (RS232 over USB) issue not from mac or linux where it's detected instantly, no the ven...
10/01/2026

Love having to hack a virtual COM (RS232 over USB) issue not from mac or linux where it's detected instantly, no the vendor decides to give you a windows binary from 2001 to "programmatically" work with your lab PSU. it can execute excel/csv files in a row and set static values, right, very programmable. unfortunately the command reference is undocumented. so, yeah. reverse engineering and searching turned out to be quicker than waiting on ticket replies and begging for documentation.

-- [AZ (Aaron Zauner)]

Yeah. Reading datasheets and building test pipelines is 85% of the work here right now.
10/01/2026

Yeah. Reading datasheets and building test pipelines is 85% of the work here right now.

"NOTE: Graph data was taken on a random sample using an Audio Precision Model APX555 Audio Analyzer.".well.. ok? that's ...
10/01/2026

"NOTE: Graph data was taken on a random sample using an Audio Precision Model APX555 Audio Analyzer."
.well.. ok? that's from a pretty big transformer manufacturers datasheet. apart from other parts of the datasheet being intentionally misleading, it's weird to point out you took a 'random' sample of a graph with high precision instruments. why not an average or detail how you sampled? because mean engineers might read this as: you took the one that fitted you best after 10.000 repetitions, after all - whats "random"? are we talking chosen by a CSPRNG? probably not. the data-sheet has further issues when clarifying THD+N clearly or frequency response. Oh. and by the way, that particular transformer, as nice as it is for some use-cases (probably) costs in the multiple hundred EUR (like 3-400 upwards) per piece.

homework: figure out what's wrong with that (compare to a TI or ADI datasheet).

— [AZ (Aaron Zauner)]

A short history on OpAmps (Operational Amplifiers) by ESP:
10/01/2026

A short history on OpAmps (Operational Amplifiers) by ESP:

Opamps - A Short History

Adresse

Vienna

Öffnungszeiten

Montag 10:00 - 11:55
Dienstag 16:30 - 22:00
Mittwoch 09:00 - 10:30
17:30 - 22:30
Donnerstag 19:00 - 22:30
Freitag 10:00 - 20:00
Samstag 11:00 - 15:30

Telefon

+436646394757

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https://secondorderharmonics.com/, https://secondorderharmonics.eu/

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