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Opus 8

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Opus 8; Telefunken (ID = 93438) Radio Opus 8; Telefunken (ID = 93442) Radio
Opus 8; Telefunken (ID = 93441) Radio Opus 8; Telefunken (ID = 93439) Radio
Opus 8; Telefunken (ID = 93440) Radio Opus 8; Telefunken (ID = 476116) Radio
Opus 8; Telefunken (ID = 476119) Radio Opus 8; Telefunken (ID = 476120) Radio
Opus 8; Telefunken (ID = 476121) Radio Opus 8; Telefunken (ID = 476122) Radio
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Opus 8; Telefunken (ID = 93438) Radio
Telefunken: Opus 8 [Radio] ID = 93438 640x480
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For model Opus 8, Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH
 
Country:  Germany
Manufacturer / Brand:  Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH
Year: 1957/1958 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 9: ECC85 ECH81 EF89 EF89 EM80 EABC80 EC92 EL84 EL84
Main principle Superheterodyne (common); ZF/IF 460 kHz
Tuned circuits 8 AM circuit(s)     12 FM circuit(s)
Wave bands Broadcast, Long Wave, Short Wave plus FM or UHF.
Details
Power type and voltage Alternating Current supply (AC) / 110-240 Volt
Loudspeaker 6 Loudspeakers
Power out
from Radiomuseum.org Model: Opus 8 - Telefunken Deutschland TFK,
Material Wooden case
Shape Tablemodel with Push Buttons.
Dimensions (WHD) 675 x 385 x 285 mm / 26.6 x 15.2 x 11.2 inch
Notes mit KW-Lupe, drehbare Ferritantenne
Paralleltype zum AEG 6087WD.
Net weight (2.2 lb = 1 kg) 15 kg / 33 lb 0.6 oz (33.04 lb)
Price in first year of sale 529.00 DM
External source of data Erb
Source of data HdB d.Rdf-& Ferns-GrH 1957/58
Literature/Schematics (1) -- Original-techn. papers.


All listed radios etc. from Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH
Here you find 3441 models, 3025 with images and 2020 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.



 


Forum contributions about this model
Telefunken: Opus 8
Threads: 1 | Posts: 12
Hits: 5741     Replies: 11
telefunken: 8; Opus
Edward Cancio
14.Aug.06
  1 I own a Telefunken Opus 8 that not only looks as new, but plays as new also.....peace.....edward cancio. I will send photographs as soon as I figure out putting them into the computer.
Omer Suleimanagich
15.Aug.06
  2 Put a fuse on the B+ current and enjoy!!!
Paul E. Pinyot † 2013
31.May.07
  3

Gentlemen,

I am restoring an Opus 8.  Quit an impressive radio.  I have the schematics from this site.  Would some one be so kind as to post or send me alignment instructions?  If none is available I will use the Grundig alignments I have and attempt a close approximation. 

I would prefer to complete a proper and accurate alignment.

Additionally, there is a 50uf 4vac (alternating current) on the secondary of the audio output transformer (mid range speakers).  Can that AC cap be replaced with two 50 uf 8 volt DC caps in wired in series with opposing polarities?

Thanks in advance,

Paul Pinyot.

 

Omer Suleimanagich
01.Jun.07
  4

Paul,

 

If I'm not mistaken, this is where a "bi-polar" electrolytic capacitor is useful.

As for all electrolytics, going up voltage specs is OK, but going below isn't.

BTW Look at the Opus 6 schematics on this site for alignment instructions.

Paul E. Pinyot † 2013
01.Jun.07
  5

Thanks Omer,

I ordered the non polar capacitor from Mouser today. http://www.mouser.com/catalog/630/595.pdf.   I do not care to "Mickey Mouse" a restoration.  Thanks for the tip on the Opus 6 Sams documentation. 

Does the Opus 6 have the long wave band below 530 khz as does the Opus 8?  And is is nice to have english schematic.  It saves me the time to have my Dad's Girl Friend to interpret technical data.

Thanks again,

Paul

Omer Suleimanagich
02.Jun.07
  6

They all have long wave.

I believe this radio is supposed to be identical to the Opus 7, just a different cabinet (slightly cheaper in build quality).  To me, these radios were Telefunkens best, since they use two EL84s.

As for the 50 mfd capacitor, I understand that it originally was a bi-polar, like in all other speaker cross over circuits that are still used today.  The later Telefunken cross over capacitors from '59 and up are distinctly marked as bi polar ones (red).  No "Mickey Mouse" here, but factory design!

The ultimate Opus radio, is supposed to be, model 2004, from the mid sixties.  It has connections for stereo reception.  By this time, interest in expensive German table radios was waning in the North American market. 

 

 

 

Jeffrey Angus
02.Jun.07
  7 Paul wrote: Can the AC capacitor bereplaced with a pair of 50 uF 8 Volt electrolytics?

Well, yes. If you use 100 uf caps. Two equal capacitors in series equals 1/2 the value.

Jeff
Dennis Daly
02.Jun.07
  8 Greetings, all.

  Since this discussion has been addressed in the past and elsewhere, I have done some small amount of studying of the topic.
 It has been written by multiple credible (to me) resources, that "bi-polar" or "non-polar"  electrolytic capacitors are essentially two conventional polarized electrolytic capacitors connected in series, but in opposite directions for polarity, within a single package.

 What is somewhat different between the aluminum polarized and non-polarized types is the method of winding the active elements and insulation layers, the varying properties of the aluminum used for the elements and assuring the low ESR rating for the non- (bi-) polarized unit.
 
 Since there is little to no D.C. component while serving in a simple typical speaker crossover circuit as that under discussion, one would think it should be allowable to utilize two conventional polarized units in series and of opposite polarity, however the rate of dielectric absorbtion in a non-polar capacitor is higher than would be in the series polarized types, given the same _effective_ capacitance.
 So, without any D.C. component in the circuit, the forming and maintainance of the dielectric throughout the normal service life of a polarized aluminum electro cap would be adversly affected

   "Non-polar aluminum electrolytics of 50 and 100-volt ratings are often used in passive crossovers for commercial and consumer loudspeakers, where the signals contain medium ac voltage components (around 30 volts peak) with little or no dc voltage content. Frequency response and vibration resistance of these capacitors are the most important criteria. Electrolytic capacitors have a positive voltage coefficient of capacitance, and this leads to some harmonic distortion." (Quoted from electrochemistry)
 
 I thought two conventional polarized units might serve this simple consumer-grade crossover task as well... and possibly they would--for some time period, anyway...Until I read more about it. Non-polar Panasonic electros from Digikey are low cost enough for me to now stock the more common values.

  Regards,
  Dennis Daly
Paul E. Pinyot † 2013
15.Jun.07
  9

Gentlemen,

Again thanks for all the help with this Opus 8.  I have restored the radio and it sounds great.  This link provides some of what I experienced with the radio.  The electrostatic speakers in particular.

http://www.ppinyot.com/T/telefunken.htm

Please enjoy and get your electrostatic speakers tweeting again.

Paul.

Omer Suleimanagich
15.Jun.07
  10

Paul,

Did you change the capacitor for the de-emphasis on FM (UKW), so that it is adjusted for the 75uS North American standard.

The Opus you restored is  the European model.

Paul E. Pinyot † 2013
16.Jun.07
  11

No I did not.  Which one is it and what should the value be?

Paul.

Omer Suleimanagich
16.Jun.07
  12

Paul,

 

I believe you have a choice here,  add 330pF parallel to C207 (330pF) as what Telefunken did in the 7, or bump  it up closer to 75uS, by adding 470pF parallel to C207.

 

Omer

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Telefunken: Opus 8
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