Majestic 71 Consolette Ch= 70 - 7A Early

Grigsby-Grunow (-Hinds) Co. (Majestic pre 1933); Chicago (IL)

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  • Anno
  • 1928
  • Categoria
  • Radio (o sintonizzatore del dopoguerra WW2)
  • Radiomuseum.org ID
  • 43682

Clicca sulla miniatura dello schema per richiederlo come documento gratuito.

 Specifiche tecniche

  • Numero di tubi
  • 8
  • Principio generale
  • A circuiti accordati (amplif. diretta) senza reazione; 3 Stadi BF; Neutrodina (con neutrocondensatore)
  • N. di circuiti accordati
  • 4 Circuiti Mod. Amp. (AM)
  • Gamme d'onda
  • Solo onde medie (OM).
  • Tensioni di funzionamento
  • Alimentazione a corrente alternata (CA) / 90-130 Volt
  • Altoparlante
  • AP elettrodinamico (bobina mobile e bobina di eccitazione/di campo)
  • Materiali
  • Mobile in legno
  • Radiomuseum.org
  • Modello: Majestic 71 Consolette Ch= 70 - 7A [Early] - Grigsby-Grunow -Hinds Co.
  • Forma
  • Console, con gambe d'appoggio basse (< 50%).
  • Dimensioni (LxAxP)
  • 27 x 46 x 15.5 inch / 686 x 1168 x 394 mm
  • Annotazioni

  • This is the early version of Majestic model 71 from 1928. See also the later version from 1929 with quite a different housing and chassis version 7B. We have found a picture of the later version as a low boy but are not sure if there is also a high boy with chassis version 7B - and vice versa. The difference can be seen on the plate: Here you find the chassis Majestic 7, model 70 in the version 7A. This set and the late version have a push-pull output stage using two 171A power tubes, later called 71A. The Majestic 71 is made of walnut with burl walnut front panels and came with a Majestic electric power unit and Majestic dynamic power speaker. But see also the minor differences between Majestic ads and the actual set. The Majestic 71 (early) uses the Majestic Power Speaker model G-1 (for receiver models 71-89) of about 8 1/2" diameter. The legs are 192 high. The set weighs approximately 80 to 90 pounds.

    This radio is a cascade of 3 individual TRF stages, each with its own feedback coil forming a Wheatstone bridge acting as a Hazeltine neutralization for the triode (described as the RFL circuit in contemporary sources). The feedback polarity is reversed with respect to the signal polarity through the Cag Miller-capacitance, in effect neutralising the triode tendency to oscillate.

  • Prezzo nel primo anno
  • 137.00 $
  • Fonte esterna dei dati
  • Ernst Erb
  • Riferimenti schemi
  • Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)
  • Letteratura / Schemi (1)
  • Grigsby-Grunow 1928 Flyer

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Il modello Majestic 71 Consolette fa parte delle collezioni dei seguenti membri.

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Discussioni nel forum su questo modello: Grigsby-Grunow -: Majestic 71 Consolette Ch= 70 - 7A

Argomenti: 1 | Articoli: 9

Dear Readers
I'm amazed of the work a very few Americans do here.
I write "Americans" because also Meyer Rochweger from Brazil is contributing very much. The two top members from the USA are Thomas Albrecht and now Robin Roeckers who also helps as model admin. Thomas has done a tremendous work on Philco models and thanks to him and Gidi Verheijen we show  Philco 2570 models. Thomas is on the board of directors. Both help very kindly if a member has problems facing the needs of quality in Radiomuseum.

Pictures from an original catalog
from the time the model was sold
I would like to show why primary sources are so essential. In this example Robin Roeckers scanned a catalog from Grigsby-Grunow from a 1928 brochure.

We can never say: "Exactly like this it must have looked" because sometimes the manufacturers change small details - and sometimes the set never gets sold!

But still: Original documentation from the manufacturer/brand is the best source. Essential too is to state which source has been taken and from when it is.

I was wondering if I find some more data or the tube line up to complete this model a bit and Googled. Then I first fell on this picture here:
 


http://www.antiqueradios.com/gallery/v/Majestic/Majestic_71.jpg.html
 

Sorry, I did not find anything more than this picture about this set - so different in appearance - but maybe it is the model 71 from 1929 with chassis 7-B. So I just want to show you that details really matter and that our approach is a different one to others: All combined on one spot with information, pictures, schematics and links to the manufacturer/brand details, tube details etc. - and those again with links to replacements etc.

I then found an eBay offer just running and asked if we may publish those pictures. They show us the chassis, name plate and "our" set ...

Since we have all the original Biders of Riders I found also the schematic under Majestic but in the order of Grigsby for Majestic 1-1 followed by details about the power pack 7-P-6 and 7-P-3, both old and new wiring (3 sheets), followed by the schematic for 70-B etc. and at 1-24 there is details about the coding of 1928 and 1929 models. Be careful: There is also the tube line up - but for other models ...

The Rider's binder "Abridged Volumes 1 - 5" does show models 60, 61 and 62 from this sheet 1-24 on page Grigsby 18 but I did not find model 71 (nor under General Household Utilities Co. - Grunow). Fortunately I have also the very first binder - yet without a number - and on page 373 there is the schematic and tube line up of the early model 70 from Grigsby-Grunow Co., drawn 7th November 1928 (figure 18) with a note: "Prior DRG 7-9-28". "Wiring Diagram for # 70-7 tube receiver 9-1W. Is that the right line? I can not yet say. It shows the tubes 3 x UX226, UY227, UX226, 2 x UX171A and 280 - or 3 x CX326 (CX-326), C327 (C-327), CX326 (CX-326), 2 x CX371A (CX-371A) plus the power unit with the CX380 (CX-380).

In General: 
There is still much to do for this manufacturer Grigsby-Grunow Co. and its brand Majestic: At the moment we have spread the models for the two names: 181 models on Grigsby-Grunov pages before 1933 and 265 models on Majestic Radio & Television Co. pages, starting in 1933. Konrad Birkner started a clean up article by beginning with: "Majestic is a name of multiple use. There is terrible confusion in literature about three separate companies. To avoid doublets ..."

Please help us in our effort to give you very precise information about the old time or antique radios by telling where we miss something or where we are in error - by delivering solid proofs. Guests can send such information via contact form. 

I see our common work as an ant colony (ant hill or ant state) - with much iteration until we find the truths - but hopefully always with good references (which might be wrong) and double checking with many different sources (but not just copied stuff from each other ...). A very hard job. Who will try to work on a brand methodically?

I bought some more original catalogs and I would send them to somebody who likes to do scanning. After that work of uploading he/she can keep or resell for his/her own benefit. We also have many original SAMS Photofact to give away in this way.

Ernst Erb, 27.Jun.09

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