Stereo Console SO390-U/S

Grundig (Radio-Vertrieb, RVF, Radiowerke)

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  • Year
  • 1962/1963
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 102341
    • alternative name: Grundig Portugal || Grundig USA / Lextronix

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Number of Tubes
  • 14
  • Main principle
  • Superheterodyne (common)
  • Tuned circuits
  • 8 AM circuit(s)
  • Wave bands
  • Broadcast, 2 Short Wave plus FM or UHF.
  • Details
  • Changer (Record changer)
  • Power type and voltage
  • Alternating Current supply (AC) / 115/220 Volt
  • Loudspeaker
  • 6 Loudspeakers
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Stereo Console SO390-U/S - Grundig Radio-Vertrieb, RVF,
  • Shape
  • Console with Push Buttons.
  • Notes
  • This model is with its full name a Grundig export version for the USA: "Stereo Console 390 U/S" with a FM-Stereo Decoder and a Stereo Amplifier NF2 (2 x ECC83 and 4 x EL84). The back wall indicates 115 volts AC only but the set is for 115/220 Volts. Power consumption 110W plus Record Changer 7.5 Watt. Pilot Bulbs 7 V/0.3A. Push Buttons are for selecting OFF,PU,BC/MW,SW1,SW2,FM and STEREO,JAZZ,MULTUSONIC,ORCH,FA/AFT.
  • Mentioned in
  • -- Schematic
  • Author
  • Model page created by Franz-Josef Haffner. See "Data change" for further contributors.

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Forum contributions about this model: Grundig Radio-: Stereo Console SO390-U/S

Threads: 1 | Posts: 7

hi,

i inherited this console fron my grandfather, Te power transformer was shot, because the filter caps failed, and someone put a wire in the fuse. 

I sent the trasformer to repair it, but the technician dissapeared with the transfomer.

the console sat for years collecting dust in my house, and now i decided to finish the repair.

i will make a full recap and change the selenium rectifiers.

i started collecting info about it to figure out the specs of the transformer.

i found the schematic for the amplifier(NF2) and with this info i figured out some specs

For the B+:

312V[A*T]150Ma after rectifier.

312/1.44=217 

first tap= 220V[A*T]150mA, but to be sure 220V[A*T]250mA.

If i consider the transformer regulation then 240V[A*T]250mA

For heaters the transformer have 2 windings:

first one for tubes in amp section and dial lamps.

The consumption for all tubes is around 4A

so this winding is 6,3V 4A

second one for tubes in pre/tuner section:

the consumption for all tubes is around 3A

So This winding is 6,3V[A*T]3A.

For bias

-16V after rectifier.

then it is adjusted with resistors to -11V 

so this winding is 12V[A*T]30mA

so far so good, but then i came across the sams photofact for this model and the values are not the same for b+

the specs for the transformer are the following:

Secondary 1: 320V[A*T]150mA

secondary 2: 6,3V[A*T]2,4A

secondary 3: 6,3V[A*T]4A

secondary 4 15V[A*T]20mA.

also lists 330V after rectifier.

i'm a little confused. 320VAC is way to high even to get 330V after rectifier and considering the loss in selenium rectifiers and transformer regulation.

also i think 150 mA is too little. 

i'm missing something?

also i'm curious about output trannies.

the sams photofact lists the following

primary: 5Kohms CT

secondary 3-4 ohms

i think 5K ist too little for  2 el84 Push-pull.

maybe is 5k between plate and center tap?, so the transformer is 10K?

 

 

 

 

 

 

Alfonso López-Martínez, 11.Feb.12

Weitere Posts (7) zu diesem Thema.