Opus 7 HiFi-System Licensed by Armstrong textile grille

Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH

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  • Year
  • 1956/1957
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 26408

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

 Technical Specifications

  • Number of Tubes
  • 9
  • Number of Transistors
  • Main principle
  • Superheterodyne (common); ZF/IF 460/10700 kHz; Export model
  • Tuned circuits
  • 8 AM circuit(s)     12 FM circuit(s)
  • Wave bands
  • Broadcast, Long Wave, Short Wave plus FM or UHF.
  • Power type and voltage
  • Alternating Current supply (AC) / 110-120 Volt
  • Loudspeaker
  • 6 Loudspeakers
  • Power out
  • 10 W (unknown quality)
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Opus 7 HiFi-System Licensed by Armstrong [textile grille] - Telefunken Deutschland TFK,
  • Shape
  • Tablemodel with Push Buttons.
  • Dimensions (WHD)
  • 660 x 415 x 280 mm / 26 x 16.3 x 11 inch
  • Notes
  • Export model Telefunken Opus 7 is shown in the Photofact Index as being the same as export model Telefunken Opus 6 which is documented clarly in that said set 341 folder 16 from 12-56 Folder. But Opus 7 has at least the 5 additional push buttons for "Solo, Jazz, Orchester, Bass and Intim" in front of the normal 8 push buttons (both models show). There are at least Version A and B or Chassis. The Opus 7 has been made in two quite different cabinets. One has the usual textile speaker grille in front, the other has vertical wooden bars in front and ony cut outs at the sides in the woods for the other speakers. You find two different pages for them - but not different wones for the color variants which show also different glass scales and knobs.

    Until we can deliver schematics for the Opus 7 USA we leave the Opus 6 USA schematics according with SAMS also on model Opus 7 USA. Power Supply 60 Cycles. Supplier was American Elite, Inc., 7 Park Ave., New York.
  • Net weight (2.2 lb = 1 kg)
  • 15.8 kg / 34 lb 12.8 oz (34.802 lb)
  • Literature/Schematics (1)
  • -- Original-techn. papers.

 Collections | Museums | Literature

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The model Opus is part of the collections of the following members.

 Forum

Forum contributions about this model: Telefunken: Opus 7 HiFi-System Licensed by Armstrong

Threads: 4 | Posts: 12

Gentlemen,

I finished a chassis restoration of an Opus 7 USA.  All electrolytic and paper type capacitors have been replaced.  The AGC electrolytic C2 has also been replaced with the same value 2uf.  All resistors checked with an ohm meter. The selenium rectifier has been replaced with a silicon bridge and a dropping resistor.  The tuning indicator was quite dim and replaced with a fresh tube.   All voltages checked and are reasonably close.
 
I completed a total alignment (am, sw and fm) and for FM used the  AM signal generator method.  The tuning indicator works great on AM but on FM it looks a bit over sensitive.  The eye will hardly open when moving between stations.
 
With FM reception the indicator hardly opens between stations.  It will open when the dial indicator is at the scale extreme (an area of no stations) and I unplug the FM dipole antenna.  Then it opens up.  I figure it may be my FM alignment technique. 
 
Q1 -  What alignment should I need to re-adjust (or start with) to yield a better tuning eye response?  Or is there another potential problem?
 
Q2 - The schematic shows two 200k resistors in series to make up test point C.  The alignment calls for 100k resistors.  I used 100k resistors. 
 
Thank you in advance for your time,
Paul
 
Found the Problem.
 
I over looked pulling a shield around the FM ratio detector tube V5.
C2 an electrolytic with + to ground was not replaced.  Once replace the
Tuning eye now properly responds.

I checked the cap on a new cap meter and read 2.2 uf.  So that did not tell
me any thing.  I hooked it up (old C2) to the simple RF gen and O-scope ESR jig and
read about 8 ohms.  Now I do not know if that is acceptable for a 2 uf electrolytic but the new 2.2uf 100v cap fixed the problem.
Paul.

Paul E. Pinyot † 2013, 16.Mar.10

Weitere Posts (3) zu diesem Thema.

Hello I have a 1957 Blond Telefunken Opus 7 Radio in Nice shape,The FM switch is worn out and will not engage. I have a spare chassis but replacing the whole switch Mechanism I am Told will cost more than it's worth.Can any body tell me if there is a way to replace just the FM switch alone, or are there any other fixes ?  Thanks: D. LaCour Nashville TN

Dennis LaCour, 21.Nov.07

Weitere Posts (4) zu diesem Thema.

Would someone out there know why the Telefunken power transformer only has 216 VAC secondary (230VAC unloaded)on the US model, but the schematics say 255VDC @110 mA for the B+ after the selenium bridge rectifier?

When my radio is powered up the reading on my radio is 233 VDC for the B+ after the selenium bridge rectifier.

Omer

Omer Suleimanagich, 29.Dec.05

Weitere Posts (3) zu diesem Thema.

Can someone provide any information for the original power (mains) transformer for this radio.

What would be a good replacement power transformer, what is the voltage and mA for the B+, and what is the amperage rating for the filament?

Does anyone have any information for the orginal "Hannover" transfomer?

The present transformer works but is vibrating (I did tighten the four bolts to the trans).

Any sugestions on what should be done?

Kindly appreciated!

Omer

Omer Suleimanagich, 21.Nov.05

Weitere Posts (2) zu diesem Thema.