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Andreas Hofmann makes himself responsible for every device leaving our factory since he knows it has been developed, constructed and checked most thoroughly (in the figure, you can see an Audio Precision Measurement System and a Le Croy 4 channel 500 MHz digital storage oscilloscope)
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Selected companies with highest quality standards manufacture according to our demands
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Review of mechanics. Very high requirements are made to surface quality
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In OCTAVE devices, only top-quality components are employed
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Mr Hofmann senior helps developing and examins with skillful eyes. Transformers are amongst the centerpieces of an amp.
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In every OCTAVE amp there are many hours of accurate handwork. Each device is manufactured individually and affectionally
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Safety test: High voltage check
 
 
Production
 

At OCTAVE it is the boss who develops: Electronics as well as design and mechanics of the amplifiers. It is our demand to construct amplifiers that sound honest and that are mechanically studied, perfectly manufactured, durable, absolutely safe and timelessly good-looking. We can only match these high quality standards if we determine formation of the devices right from the beginning. At OCTAVE, every amp is individually handmade. With our qualified team we can reach and ensure quality standards that would not be possible in case of externally bought elements. Top modern measurement systems are very valuable in development and allow measurements according to international standards.


Mechanics and electronics

The design of an Octave device complies with the motto "form follows function". Only when all logical and safety-relevant reflections have been considered, the design of a device is finalized. A clearly structured and user-friendly design is always a priority. We collaborate with highly qualified companies in our surrounding area. Some mechanical parts go through up to 5 stages. To exclude errors in the single process steps right from the beginning, the parts are submitted to a thorough quality control after each step.


Steps at the example of the front panel for our V80:
1. CNC-milling " quality control at OCTAVE and forwarding to surface processing
2. Glass bead blasting " quality control at OCTAVE and forwarding
3. Partial polishing of surface " quality control at OCTAVE and forwarding
4. Anodizing " quality control on site and forwarding
5. Silk screening " final control at OCTAVE

A lot of work and time has been put into each mechanical part before it can be assembled. Also production of the PCBs is very elaborate. After optimization of the PCB layout by producing some prototypes, the serial circuit boards are produced and equipped by ISO certified producers.

The equipped PCBs are checked and adjusted to 100%. It is a long way before availability of all mechanical and electronical components of a device.

Not only the circuits but also the incorporated components are responsible for durability, reliability and sound of a device. In OCTAVE devices, only top-quality components are employed, e.g. relays by NAIS, electrolytic capacitors by EPCOS, condensers by WIMA, SOLEN and ROE, switches by ELMA, transformers of our own production, speaker clamps by Druseidt and so on and so on…


The OCTAVE in-house transformer winding
Since OCTAVE originated from a transformer winding shop, we have the know how to develop our own transformers and produce them specially tailored for our devices. Only high temperature resistant enamelled copper wires and low-loss core materials are employed.

To increase long-term constancy, the transformers are vacuum soaked or moulded. Magnetic shields eliminate possible interference.


Preproduction
Once all electronical and mechanical parts are ready, preproduction can start. At OCTAVE, four employees are exclusively charged with preproduction of the single devices.


Check and safety tests
After the preproduction phase, the device is extensively checked. Test records for each device are set up, components and features of a device are documented. Up to one hundred measurement points are checked and compared to the reference values. Only upon completion of the electric check, the design parts are mounted and final assembly of the device starts. In this stage, customer specific requests can still be considered. After that, each device passes 24 hours of continuous operation; finally, the parameters of the output tubes are checked. In the listening room, the devices are listened to and pass another 24 hours test. For the different models, different loudspeakers are available. One possible source is an analog disk player with MC pick-up head. Our acoustically optimized listening room allows reproduction of sound characteristics under optimum conditions. The listening room has a reverberation time of about 0.3 seconds.

Once the devices have run through this check procedure, they have to pass different safety tests before they can be shipped into all parts of the world.


Last check and shipping
Without documents like operator’s guide, warranty card and packing lists, no device is complete. Prior to packing, the amplifiers have to pass one last optical and mechanical check, e.g.: Are all turning knobs and switches in the right position? Before shipping, the output tubes are removed from the device, labelled and packed separately.


Conclusion: OCTAVE devices are 100% handmade in Germany
We know our devices right from the first screw, can deliver all parts also later and can support in both word and deed if service is required, independent of the device’s age.

 
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