Musica 4R217 3391
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| Year: 1955/1956 | Category: Broadcast Receiver - or past WW2 Tuner | ||||
| Valves / Tubes | 6: ECC85 ECH81 EF89 EABC80 EM80 EL84 |
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| Main principle | Super-Heterodyne (Super in general); ZF/IF 460/10,7 kHz |
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| Tuned circuits | 6 AM circuit(s) 10 FM circuit(s) |
| Wave bands | Broadcast, Long Wave and FM or UHF. |
| Details | |
| Power type and voltage | Alternating Current supply (AC) / 110; 127; 150; 220/240 Volt |
| Loudspeaker | 3 Loudspeakers |
| Power out | |
| from Radiomuseum.org | Model: Musica 4R217 3391 - Graetz, Altena Westfalen |
| Material | Wooden case |
| Shape | Tablemodel with Push Buttons. |
| Dimensions (WHD) | 600 x 380 x 270 mm / 23.6 x 15 x 10.6 inch |
| Notes | Gerät mit 4R-Raumklang |
| Net weight (2.2 lb = 1 kg) | 12 kg / 26 lb 6.9 oz (26.432 lb) |
| Price in first year of sale | 398.00 DM |
| Collectors' prices | |
| External source of data | Wiesmüller |
| Source of data | Lange, Schaltungen der Funkindustrie |
| Mentioned in | -- Original-techn. papers. |
All listed radios etc. from Graetz, Altena (Westfalen)
Here you find 748 models, 653 with images and 565 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
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Hits: 3655 Replies: 4
graetz: 4R217 (4 R 217); Musica - Tube count
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Robert Sarbell
18.Jun.08 |
1
Gentlemen, The data sheet lists 6 valves/tubes for this model; however, the rear panel identifies 7 rohren - with the abbreviation referring to the rectifier. Is the rectifier a solid state device OR is it another tube? Respectfully, Robert |
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Ernst Erb
18.Jun.08 |
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Dear Robert Good question: The plan number 3391 for the Musica 4R/217 shows clearly 6 tubes, the rear panel indeed 7 tubes. It might be that the first series had a rectifier tube instead of the solid state rectifier shown in this plan. The chassis shows an empty hole which could fit an other tube. We would have to dig deeper to find out than I can. In any case: the number of tuned FM circuits is 11 on the plan but 10 on the rear panel. You might even get a smaller count! Perhaps Hans M. Knoll can tell us more - or Jens Dehne who is a Graetz collector? Possibly Heinz Hermann Luks knows the owner of the pictures he has uploaded with selection "not from my collection". But we are pretty sure that his photos show a 6 tube model. The change history does not tell us new facts and no catalog is given as reference for this Graetz from 1956. Since we have a difference in tube number plus in FM circuits between back panel and schematic I'm prety sure that we ought to have to model variants. But first we must have more evidance. |
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Hans M. Knoll
19.Jun.08 |
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Hello Robert, hello Mr. Erb
Zählweise der Röhren und Kreise bei Rundfunkgeräten
In der Übergangszeit in der Röhren als Gleichrichter und Trockengleichrichter je nach Modell in Verwendung waren gibt es Fälle in denen einige Modelle oder Exemplare mit Röhre oder Trockengleichrichter bestückt waren.
Die Industrie und der Handel waren stets bestrebt hohe Zahlen angeben zu können.
Da war dann, wo es um Röhren als Anzahl geht, eine Gleichrichterröhre eine Röhre.
Wird sie mit einem Halbleiter ersetzt, bleibt die Funktion erhalten, aber die Stückzahl geht um 1 Stück zurück. Daher haben die meisten Hersteller einfach den Halbleiter (Trockengleichrichter) als Röhre mit gezählt.
Hier bei dem Modell von 1956 ist das aber nicht der Fall. Die Firma Graetz sagt in den Firmenunterlagen: 7 Röhren (einschl. Selengleichrichter) was also korrekt ist.
Dass der Selen eigentlich keine Röhre ist, wird offen gelassen.
Im Jahr 1960 wurden Absprachen der Funkindustrie wirksam, die Nebenfunktionen nicht mehr als Röhre anzeigen dürfen. Bei 1960er Modell Musica 916 steht daher jetzt: 8 Rö + Tgl.
Als Beleg ein Auszug der original Firmenschrift zur Musica 4R_ 217 dort ist der Selen zwar in () erwähnt, aber mit gezählt.
Im Katalog des VDRG Verband der Rundfunk Grosshändler, ein vom Verband finanziertes Werk, wurde im stetigen Streit mit den Herstellern, eine Zählweise verwendet mit der jedes Gerät jedes Herstellers vergleichbar wird.
In den 60er Jahren wurde vom Verband der Funkindustrie eine verbindliche Richtlinie erstellt, in der klar geregelt wurde, was ist eine Röhre, eine Röhrenfunktion, ein Kreis der eine Funktion im Sinne von Empfangsleistung darstellt.
Das ist eine endlose Geschichte. Ein Trapp der eine Frequenz unterdrueckt die aus dem Radio oder FS-Gerät abgegeben wird hat eigentlich mit Empfangsverbesserung nichts zu tun. Ein Trapp in der ZF eines TV- Gerätes oder ein 9 bzw. 5 Khz- Filter (Sperre) aber sehr wohl.
Ich meine, solange hier im RMorg, keine fachlich einwandfreie Diskussion über die Wirkungen und Funktion von Schwingkreisen, ganz gleich wo sie eingefügt sind gefuehrt wird, bleibt das Thema was ja des öfteren schon aufgezeigt wurde offen und wird nicht fachmännisch zu beantworten sein.
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Mr. Jens Dehne hat also uploadet new and complete Datas and Diagramm for this model.
regrads hans
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Bernhard Nagel
19.Jun.08 |
4
Dear colleagues, a comprehensive answer from Mr. Knoll, thank you! Last open remark from Ernest is the present chassis hole for fixing another tube socket. Here we must know that companies like Graetz, Grundig... uses one chassis for several models to lower cost of manufacture. The top-line model from 1955/56, Graetz named it Sinfonia 4R/221, has one additional IF stage (one more EF89 and IF filter) which occupies the not used holes between mains transformer and FM front end.  The last model year where Graetz uses rectifier tubes was 1952/52 according to the VDRG catalogues. Since 1953/54, all models shows a selenium rectifier.
Regards, Bernhard |
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Ernst Erb
19.Jun.08 |
5
Thank you very much for the different answers. We have now several things to clear: 1 Most essential: We will always find differences between different sources - even if those information come from the (same) maker - as seen above. If we tell only a part of the story we will always face model change suggests and discussions. We have to cope for all different versions like model names, number of circuits, tubes or tube counts. But most essential: We have always to declare the source and to compare with the other sources. This has not been done here for Graetz. For instance Musica 1955 and Musica 1956: Initially I have entered those models on the basis of the "Handbuch 1955/56" with that name: "Musica" as ID = 1759 and for 1956/57 "Musica" was ID = 1773 Since this arrived to two equal names for a different model I had to add in the variation field 1955 and 1956. Much later I was told by Walter Wiesmüller that according to the Lange schematics book there is "also" a model Musica 4R217 now ID = 25327 and Musica 4R417, now ID = 25328. I was then not critical enough to recognize this as a doublet. And nobody did ... Just because Hans M. Knoll showed us the catalog entry I analyzed the story ... This is a clear example why it is necessary to tell in the notes the different names from different sources including schematic (3391). Before we change something I would like to discuss this with Jens Dehne because I want to do an example model for this interesting case. This will not be before next week. 2 Our tube count (and tube line up) is done independently to different customs in different times and countries/makers. The rules are clear. In this example (Musica 4R217, 3391) we have 6 tubes as number and we have to tell why 7 are given in the catalog - and we should list the rectifier to make it clearer. 3 Count of tuned circuits On a telephone conversation with Hans M. Knoll of today we agreed that the count of tuned circuits for AM makes sense and is rather easy. We also agreed on our rules: We count only tuned circuits which enable or improve directly selection/selectivity (Wahl/Trennschärfe) and/or sensitivity/sensitiveness (Empfindlichkeit). On a standard superhet that is RF, Oscillator, two filters with normally 2 tuned circuits each - in total 6. Since circuits are the most essential parts of a conventional receiver I did some simple explanations in my bookincluding band-pass filters. We know that for the USA the count of tuned circuits was not a public subject - but it was in Europe. Mr. Knoll told me about the discussions between engineers and the sales department etc. and that even looking on a schematic, for FM it is not always certain if you dont see and measure the parts whether we should count or not. In detail going we can even agree that it can be nonsense to count them. Therefore we can copy the number of tuned circuits from the sources given and not be exact in counting ourselves. The best is to come: Hans M. Knoll will write a rather complete information about all kinds of circuits in a traditional radio - first AM , later FM too. He will do this in German first and I hope to get the OK from Thomas Albrecht for a translation too. Mr. Knoll will have to take his time and also Thomas. I will now close this thread for now. |
End of forum contributions about this model
