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Majestic Stereo Console SO160 Ua

Majestic Stereo Console SO160 Ua; Grundig Radio- (ID = 2150921) Radio Majestic Stereo Console SO160 Ua; Grundig Radio- (ID = 1831971) Radio
Majestic Stereo Console SO160 Ua; Grundig Radio- (ID = 2152837) Radio Majestic Stereo Console SO160 Ua; Grundig Radio- (ID = 2377344) Radio
Majestic Stereo Console SO160 Ua; Grundig Radio- (ID = 2377345) Radio Majestic Stereo Console SO160 Ua; Grundig Radio- (ID = 2377346) Radio
Majestic Stereo Console SO160 Ua; Grundig Radio- (ID = 2377347) Radio
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Majestic Stereo Console SO160 Ua; Grundig Radio- (ID = 2150921) Radio
Grundig Radio-: Majestic Stereo Console SO160 Ua [Radio] ID = 2150921 1400x848
Select picture or schematic to display from thumbnails on the right and click for download.
For model Majestic Stereo Console SO160 Ua, Grundig (Radio-Vertrieb, RVF, Radiowerke):
Front of Grundig SO 160ua that I am recapping for a friend.
 
Country:  Germany
Manufacturer / Brand:  Grundig (Radio-Vertrieb, RVF, Radiowerke)
alternative name
 
Grundig Portugal || Grundig USA / Lextronix
Year: 1960/1961 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 12: ECC85 ECH81 EF89 EABC80 EM84 ECC83 ECC83 ECC83 EL95 EL95 EL95 EL95
Semiconductors (the count is only for transistors) Metal-rectifier
schematic requested
Main principle Superheterodyne (common)
Details Changer (Record changer)
Power type and voltage Alternating Current supply (AC)
Loudspeaker 5 Loudspeakers
Power out
from Radiomuseum.org Model: Majestic Stereo Console SO160 Ua - Grundig Radio-Vertrieb, RVF,
Material Wooden case
Shape Console with any shape - in general
Dimensions (WHD) 45 x 32.5 x 17 inch / 1143 x 826 x 432 mm
Notes

US export model. Available in Wood or Hi-Gloss finishes. See also domestic model SO160.

Data taken from "Billboard" magazine. We are not certain about the type suffix, it could be SO160U or SO160US.

Suffix type is SO160Ua, per photo of label.

Price in first year of sale 520.00 $
Mentioned in Billboard Feb. 1961

Model page created by Mark Hippenstiel. See "Data change" for further contributors.



All listed radios etc. from Grundig (Radio-Vertrieb, RVF, Radiowerke)
Here you find 6064 models, 5290 with images and 4093 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.



 


Forum contributions about this model
Grundig Radio-: Majestic Stereo Console SO160 Ua
Threads: 2 | Posts: 5
Hits: 771     Replies: 2
grundig: Cause of High Voltage
Craig Vodnik
23.Sep.17
  1

I've recapped my console by reading the values from the old caps and replacing with the appropriate modern version.  

In all of the restorations that I've done, I've never seen a Grundig schematic that has a voltage listed on greater than 300V following the rectifier so when I measured 330V, I tried to check things to see what the possible issue was.

I replaced the rectifier and measured 270V at the DC output side with nothing connected to it.  As soon as I reconnected the rest of the electronics to the DC output side, the voltage jumps back to 330V.  

I have replaced a number of the tubes, but since I don't have the schematics, I am struggling to figure out where the problem is.  Any guidance of what to look at it appreciated!

craig.

Tomasz Szczesniak
23.Sep.17
  2

It is normal behaviour. Bare rectifier (without capacitors) has DC at output at mean value. When capacitor is added DC value equals to amplitude of AC voltage connected to rectifier. When capactor and some load is connected the DC value is lower than amplitude, but still higher than this without any other elements connected to rectifier.

Craig Vodnik
30.Sep.17
  3

Thanks Tomasz. Put a wirewound resistor in between the rectifier and main electrolytic caps, voltage went to expected level.

Now I'm experiencing no sound output at all even though the voltage is where it should be.  I'm sure that it's something simple because before I reduced the voltage, I could get some (garbage) audio out of the speakers.  Any thoughts on what and how to test for this issue?

 
Hits: 1011     Replies: 1
grundig: Looking for schematic
Craig Vodnik
23.Sep.17
  1

I have a Grundig SO 160ua that I am working on for a friend.  I realized that the schematics listed for the SO 160 are not the same as for the SO 160ua, unless I'm doing something very wrong.

On the schematics for the 160, there is no EABC 80 tube and there's an EBF 89 but not an EF 89, as you can see from the tube location plan below.

Does anyone have the schematic or know what the difference is?

Michael Watterson
24.Sep.17
  2

The EABC80 has an AM detector and and two diodes for FM.

The EBF89 adds two diodes for AM (audio and delayed AGC) to an EF89. Likely then there are two germanium diodes for FM detector. The EABC80 also has a triode for audio preamp. I don't  know what is replacing that on the other model (maybe  nothing or there is another tube you missed such as an ECC83)

Such changes betweeen other similar models are common by 1960s as the price of semiconductors fell (the tube portable sets in 1950s with VHF-FM always used semiconductor diodes on FM to save power).

See the domestic version  It uses EBF89 ECC83 and 2 x OA174 semiconductor diodes to replace the EABC80 and EF89

 
Grundig Radio-: Majestic Stereo Console SO160 Ua
End of forum contributions about this model

  
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