Grundig Model 960

[Marilina Crawn]

Youwill need your model number and/or serial number to access many of our services such as downloading a replacement manual, booking a repair, ordering an accessory or buying a spare part. Finding your model number /serial number is easy. Simply look at the Grundig appliance images below for further guidance:

Dear friends

Since nobody dares to enter the data for the export models I did this task now.

It can be very well that I did some errors. Since the 7000WE seems to be without FM I entered only 3 AM bands and that could be wrong. Hopefully Mr. Knoll knows ;-)

The same thing I did with 7015WE ... (well without really knowing).

We all still hope that Jeffrey Angus will be posting some pictures to the model 7000USA - the scale (only) in big size would be of great interest, but also outside in general, chassis etc.

I cleard some postings here which are now not anymore necessary.

Then I wrote to Arpad Roth, the administrator for schematics to care for the right places since one of the domestic models has "fallen out" (only color version).

To end the clearing up I move now this thread to the model.

I know that some guests and members do not read the blue info buttons to know how to use the different search engines we have - therefore: To get all the Grundig 7000 you only enter 7000 to the "Simple search for Antique Radios etc.". At the moment you will get 37 results on one page where you select your model - can get back and select an other one etc.

If you use the SEARCH then you get 103 hits on models because this SEARCH is for text. It looks up the following different sections: "Forum" and "Papers", then the Attachments in those two forums and then the field "notes" only on models where seldom also the model number is repeated. At last it even looks up the personal text in collections (besides the photo - often missing ...).

So I set about modelling an actual Grundig 2440 radio (from this sample photo). Since I need the radio in extreme closeup, I needed to add lots of details. Texture maps were used for the fabric grille over the loudspeakers, and for the reflective dial plate.

It then struck me that it would be interesting to have the dial plate reflect an actual photo provided by the client, featuring people listing to radios or working in broadcast studios. I could then even turn the reflection into a slide show, there the images crossfade over time. Finally, I decided that the large ivory buttons on the radio would be depressed according to the web page currently being visited.

My research area, which can largely be described as Industrial Mathematical Modelling, is concerned with building mathematical models to describe microfibre release from clothes and filtration of these microfibres in a washing machine. Microplastic fibres from our clothes make up around 35% of all of the microplastics in the oceans, and it is estimated that each person in the UK produces on average 243g of microplastic fibres per year when washing their clothes in a standard washing machine. Thus, many countries have started to introduce laws requiring new washing machines to filter out microfibres when draining waste water.

Working in collaboration with Beko plc, we are exploring simple mathematical models to determine how to minimise microfibre release and maximise filtration efficiency within a washing machine, defining my research into two main processes, generation and filtration of microfibres.

Inside a washing machine drum, various mechanical forces act on the clothing to cause the generation of loose microfibres. We have been constructing models to describe the underlying mechanics that help and hinder release. We started our investigation by looking at a continuum model of erosion due to water shear stress, and we are currently looking at building a model for individual fibre release. These represent our continuum and discrete based models.

We started our understanding of microfibre release by assuming that we have a small layer of fibres, or fuzz, on the surface of a piece of clothing. We treat this layer as a continuum, and assuming that the height of this layer is small compared to the length of the material, then we may utilise a lubrication limit for the flow over this material. We have assumed that the flow over the material is providing some shear stress to the material and eroding away material when this overcomes some critical friction or shear stress.

In addition to fibre generation, we are also exploring a new method of solid-fluid inertial separation called ricochet separation, to increase the life expectancy of the current microfibre filter within Beko and Grundig washing machines. In 2021, Grundig, which is a sister company of Beko and owned by Turkish household appliance manufacturer Arelik, were the first company to produce a internally installed microfibre filter, called a Fibercatcher, capturing up to 90% of microfibres. We want to prolong the life expectancy of this microfibre filter so that the consumer would need to replace the filter less often.

We are exploring a technique used by manta ray fish to expel water when ingesting plankton rich water, which has been studied in [1]. Within a washing machine, this method would be utilised by removing some volume of microfibre free water from dirty fibrous water decreasing the pressure drop over the Fibercatcher filter and inturn increasing the lifespan. By utilising mathematical techniques coupled with computational fluid dynamics, we will study the dynamics of the flow and particle behaviour, and eventually optimise the design parameters to increase filtration efficiency.

When a particle comes into contact with the curved surface of the geometry, we have assumed that the particle bounces balistically, where the angle of reflection is equation to the angle of reflection.

From our initial CFD simulations of Beko's ricochet device, we noticed that the flow looks somewhat periodic over a cell, the width between each repeatable domain. It seems like we would be able to use some form of homogenization techniques to smooth out the geometry of the branched channel gills into an effective boundary condition on the bottom wall in a simpler domain.As an initial point of studying the flow and finding this boundary condition, we consider a simpler domain for the ricochet device flow. We construct a domain of a series of T-Junctions, and apply a given outlet pressure, $\mathcalP_\textout$, representing the pressure of the Fibercatcher filter which the dirty water is flowing into, and constant inlet flux. From this structure, it has made it an easier starting point to find this effective boundary condition, given by a Darcy like flow,

We are currently utilising methods of multiple scales and homogenization to solve for the flow in this domain, which will allow us to calculate the flow behaviour more efficiently This involves, boundary layer anaylsis, multiscales analysis, complex analysis and matched asymptotics to identify an effective boundary condition on the wall of simple channel flow. We have found that the `clean water' cross flow which is expelled out of the bottom branched channels is effectively a Darcy like flux condition, given by

N2 - Mange kortvarige forbrugsgoder har den egenskab, at de ikke ndvendigvis forbruges i den periode, hvor de kbes, fordi det er muligt for forbrugeren at lgge dem p lager til senere brug. Dette glder fx for varer som kaffe, te, l, spiritus, lskedrikke, sbe, vaskepulver, hrshampoo, tandpasta, papirvarer og konserves. For denne type varer er det klart, at den aktuelle strrelse af forbrugerens lager (dvs. beholdning af varen) som hovedregel vil spille en afgrende rolle for hans kbs- og brugsadfrd i en given periode. Dette forhold kommer eksempelvis implicit til udtryk, nr man i kvantitative modeller for en virksomheds afstning og/eller markedsandel finder en signifikant effekt ikke kun af den aktuelle pris for varen, men ogs af prisen for varen i n eller flere tidligere perioder. Se fx Birch, Olsen og Tjur (2005).En sdan effekt er imidlertid kun en indirekte effekt. Den direkte determinant for forbrugerens kbs- og brugsadfrd er ikke prisen for varen i en tidligere periode (som man jo ikke kan kbe indtil mere i den aktuelle periode), men derimod strrelsen af forbrugerens lager af varen p det tidspunkt, hvor kbet og forbruget realiseres. Men det er klart, at strrelsen af det aktuelle lager vil vre bestemt af prisen for varen i n eller flere tidligere perioder. Endvidere er det klart, at prisen for varen - ikke kun i n forudgende periode, men i en lang rkke forudgende perioder - vil vre en indikator for, om prisen for varen i den aktuelle periode er hj eller lav. Det sidstnvnte forhold vil vi dog se bort fra i det flgende.Problemstillingen i denne artikel er herefter at opstille en model for forbrugerens kbs- og brugsadfrdfor et kortvarigt forbrugsgode, hvor den aktuelle strrelse af forbrugerens lager af varen gres til direkte determinant for hans adfrd. Foruden strrelsen af det aktuelle lager af varen vil vi inddrage den aktuelle pris for varen som determinant for forbrugerens kbsadfrd. Nr vi kun inddrager denne ene beslutningsvariabel i modellen, skyldes det alene nsket om at simplificere fremstillingen. Modellen opbygges nemlig sledes, at den umiddelbart vil kunne generaliseres, ved at der inddrages yderligere forklarende variable for kbs- og brugsadfrden i den, fx virksomhedenssalgsindsats og konkurrenternes pris og salgsindsats.En tilsvarende problemstilling har hyppigt vret behandlet i den afstningskonomiske litteratur.Se fx Jain and Vilcassim (1991) for en grundig litteraturgennemgang og modelsammenligning. Men de benyttede modeller har et noget andet udgangspunkt end vort. Dels fordi modellerne er modeller for ventetiden mellem to p hinanden flgende kb af varen. Eksempelvis eksponentialfordelingen og den negative binomialfordeling (Ehrenberg (1959)), Erlangfordelingen (Herniter(1971), Zufryden (1978), Jeuland, Bass and Wright (1980) og Gupta (1988)) og Cox's hazard model (Jain and Vilcassim (1991)). Dels fordi det aktuelle lager af varen kun indgr indirekte i modelkonstruktionen via strrelsen af det kbte kvantum ved forrige kb. Den model, vi vil opstille i det flgende, er i modstning til ovennvnte modeller en model for antal kbte enheder af varen i en given periode, hvor strrelsen af det aktuelle lager af varen indgr eksplicit i modelkonstruktionen.Fordelen ved denne modelformulering er, at man fr mulighed for at bestemme sandsynlighedsfordelingenfor strrelsen af forbrugernes lager af varen p et givet tidspunkt.

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