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Old 14th Oct 2021, 5:44 pm   #1
pym1958
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Default Telefunken Concertino 8.

Hello,

i have a 1958 radio , a Concertina from Telefunken. But no user guide.
It seems that the volume button does not work.

I would like to fix this.

Thanks.

Pierre Yves
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Old 15th Oct 2021, 3:04 pm   #2
simpsons
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Default Re: Telefunken Concertino 8.

Pierre

First, please excuse me writing back to you in English. By all means use Google translate.

Whilst I am sure at the end of the day we can sort out just which spelling Telefunken used for this model, the problem you have is no sound.

To help you here, there are a few checks to be made to find out why.

The first is, with the back cover off, can you see if the valves are lit up? You are looking for a dull orange glow inside the glass, these are the valves heaters and best seen at the bottom of the glass envelope. If they do, then the mains voltage is getting to the mains transformer.

This transformer does 2 things. It reduces the mains voltage, usually, 240volts AC to 6.3 volts to power the heaters and secondly, provides the right voltage to the circuit which creates the high voltage, generally, 250 volts DC also needed to make the radio work.

If the valves heaters are glowing, does the "magic eye" tuning indicator at the front of the radio glow green. If it does, then the 250 volts DC circuit is working.

Should the valves not light or the magic eye not glow then you will need to do some fault finding.

The fault could be as simple as a fuse that requires replacement or a valve.

May I ask you to attach a photo of the radio or give the model number shown on the back card cover.

Also, a brief explanation of when the radio was last working and did it just stop or is this a radio you have just purchased.

Something else, do you have any experience in working on a radio and do you have a test meter if we need to measure for say a faulty fuse.

Chris
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Old 15th Oct 2021, 5:09 pm   #3
pym1958
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Default Re: Telefunken Concertino 8.

Well first all of all, sorry for my first answer that was totally dumb; second, thank for all the answers, specially the last one which is quite accurate.

I am no technical specialist, so not sure I understand all you said. Best thing (like with IT), just try, and see if it works! Well, I am going to open wide the "machine" and check.

The fact is that I am moving very soon, so the radio is wrapped up, and I can not even see the real name (a or o in the end?). While organizing the move, I just discovered that old radio in the basement, so beautiful, and it works! With a nice warm sound. except I cannot change the volume.

Next week is my real move. I promise I'll try again with all your precious advices!

PS: I am always astonished with the "specialized" forums to see so many people involved and competent.

Thanks.
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Old 19th Oct 2021, 3:24 pm   #4
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Default Re: Telefunken Concertino 8.

Bonjour Pierre!

Je suis allemande et j`habite direction Aix-la-Chapelle.
Avant Corona j`ai visité Paris beaucoup.
Je propose mon aider, ne casser pas s.v.p. ce poste.
Il est possible que je revenir à Paris pour un/deux achete(s).
Mon achetes sont deficile, parce-que les vendeurs sont deficile - pas de reaction!
Quand les achetes marche et la meteo est bien, j`aimerais visite Paris encore.
Vous avez un place de parking où est-ce que tu habite dans le centre?

Vous-avez des capaciteurs pour changer? Un ancien poste a besoin des capaciteurs nouvaux.
Il y a plus de travail.

Bièn cordialement,

German Dalek
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Old 19th Oct 2021, 4:09 pm   #5
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Default Re: Telefunken Concertino 8.

Help, although my son lives in Vienna, his wife, her family and friends speak perfect English so German Dalek, apologies for replying to you in English.

This is a very kind offer and I imagine, depending on where Pierre is moving to, he will let you know if he can take this up.

One thing, in his last post but one there was a correction, he said that the radio worked BUT he couldn't change the volume up or down.

This could be just a shot of a switch-cleaner to make the control wiper make contact with the track (if only so easy) or a new volume control needed.

If the latter, the exact Telefunken model will be required which is promised.

Chris
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Old 20th Oct 2021, 6:21 am   #6
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Default Re: Telefunken Concertino 8.

Hi Chris, thanks!
I could imagine, that the rest of the radio is not up to date.
So if it is "still" working over the years, it will need "soon" a
complete re-capping.
Because Pierre is new to this hobby, he has to know, that he
has to count on more problems when using it in the future.

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Old 20th Oct 2021, 7:13 pm   #7
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Default Re: Telefunken Concertino 8.

Hi to all,

@Pym1958: Bonjour Pierre,

There is a selection of Telefunken Concertino tube radios on docTSF (see photo)
Page 10 of 19 dedicated to Telefunken products:

https://www.doctsf.com/grandlivre/pr...n.php?ln_pg=10

Main search data entry by brand/model :
https://www.doctsf.com/grandlivre/index.php?ps_raz=1

Best Regards
jhalphen
Paris/France
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Old 21st Oct 2021, 10:49 am   #8
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Default Re: Telefunken Concertino 8.

Bonjour Jérôme

Many thanks for listing the site DOCTSF.

This one is new to me and illustrates just how prolific radio and television design and manufacture was in continental Europe. It was, as I am sure you know, the same here.

Wireless World from 1935 onwards detailed radio television development in the UK, with many photo's of the models on offer; a 1937 edition reviewed the German Radio Exhibition again in 1955 & last in 1965, the imported set review of that year also highlighting the competition which British Manufacturers faced.

We were so lucky to have the partnership of Philips Eindhoven with Mullard who together created the foundation for much of UK development, notwithstanding of course GEC Research Laboratories, who in 1951 showed off their germanium crystal triode radio!!

Chris




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Old 13th Dec 2021, 6:13 pm   #9
pym1958
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Default Re: Telefunken Concertino 8.

Hello,

i'm back.
I tried to use the radio, but now, i have no sound at all. I opened it to get pictures. Here they are.
I tried to get FM, with no luck. No sound at all.
I looked at the fuse on the right. It seems empty.
And there is that "stick" on the third picture. which is not fixed at all, but was laying inside the radio.
There is orange glowing on the tubes, some strong, some weak.
And on the front, there is the green signal, but it does not change while i am turning the FM button on right or left.

Pierre Yves
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Old 13th Dec 2021, 9:56 pm   #10
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Default Re: Telefunken Concertino 8.

Several posts deleted now that the radio model has been positively identified from photographs as a Concertino 8.

https://www.radiomuseum.org/r/telefu...certino_8.html
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Old 14th Dec 2021, 10:39 am   #11
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Default Re: Telefunken Concertino 8.

The "stick" is the ferrite rod antenna for LW and MW (GO et PO).

It would seem that the set has suffered some damage whilst being moved!

The "stick" would normally be mounted on a support, sometimes a rotatable one to adjust for best signal (the ferrite rod antenna is directional with a null if the rod is end on pointing at the transmitter). If the connections to it are still OK, it can simply be fixed back where it should be, otherwise it's time for the soldering iron!
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Old 14th Dec 2021, 10:55 am   #12
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Default Re: Telefunken Concertino 8.

The ferrite rod aerial is mounted an a turntable as shown in the attached picture.
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Old 15th Dec 2021, 3:35 pm   #13
pym1958
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Default Re: Telefunken Concertino 8.

Hello,

i found out where the ferrite should be installed. I did it, but
I can not get Petites Ondes or Grandes Ondes.
FM no longer works too. Before the move, it worked, but i could not change the volume. Now, i do not get any frequency.
Still cleaning it . But i am pessimist.

I will let you knowif it is getting better.

Message to Dalek: i am no longer in Paris, but in the South West, near Bordeaux. Sorry.

Pierre Yves
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Old 15th Dec 2021, 4:27 pm   #14
pym1958
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Default Re: Telefunken Concertino 8.

Good news. I moved just a little the radioset (90 dégrees).
I can get FM, but very low. And can not change the volume.
PO/GO still not working.

Pierre Yves
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Old 15th Dec 2021, 8:48 pm   #15
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Default Re: Telefunken Concertino 8.

Check that none of the wires leading to the ferrite rod aerial are broken. That's what generally happens when a ferrite rod aerial gets dislodged.

Also check that the rod itself isn't broken.
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Old 15th Dec 2021, 9:34 pm   #16
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Default Re: Telefunken Concertino 8.

You can test the audio section of this radio by connecting a signal to the phono pickup in the back. Depress the TONBD-TA key next to the AUS key on the front. This selects the signal from the back. For a test signal just use your finger - it will feed a 50 Hz signal through the audio section. Check if you can control the loudness with the volume control. Note: There are two inputs on the back. This is the one on the left that has a picture of a phonograph. And this input has two sockets - the socket on the left is ground - do not use this one. Use the socket on the right. A little bare wire like a paper clip works just fine.
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Old 3rd Jan 2022, 6:41 pm   #17
pym1958
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Default Re: Telefunken Concertino 8.

Hello,
i tried the previous advise. I could not hear any sound by using the right socket.
But using the left, i heard some weak scratch sound.
For what it worth.

Pierre Yves
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Old 21st May 2024, 3:18 pm   #18
pym1958
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Default Re: Telefunken Concertino 8.

Hi again,

i had some time now to work on that old concertino .
I have still the problem of the volume button.
I thought it was an electronic problem. In fact, it is a pohysical problem. The button turns ok, but it has no effect because the axis is blocked.
I opened the concertino. And that axis (as shown on the picture) is shared for "antenna ferrit" and volume
For the antenna ferit, it turns ok, i can see the figures moving. But for the volume, nothing happens, the volume axis is blocked. i do not know how to change that. With a plier, i can rotate the axis. but it is hard. on the picture, the blue is for antenna "axis", the red for the volume.

PYM.
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Old 23rd May 2024, 11:36 am   #19
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Default Re: Telefunken Concertino 8.

Double-Post removed!
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Old 23rd May 2024, 11:42 am   #20
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Default Re: Telefunken Concertino 8.

Bonjour à Paris!
You need something like WD-40!
Please remove the dial with extremly care, after you removed the knobs!

The wheel with cord for the antenna rod will be made of plastik, often.
Because I want to save you from repairing the stringing you cannot use
heat to remove hardened fat.
Lay the chassis on the back (carefully) with the axle showing up.
Use a plier after you have soaked the axle with WD-40 where it enters
the outer axle of the pot.
Move the axle with the plier very carefully, because you don't know, if the pot
stands in the middle or at one of both ends.

In that case you could damage to pot by moving the axle very easily.

If you are in about the middle of the resistor, move the axle left and right
with the plier about 30 times or more for about 90°, add more WD-40.
You will see, that the axle is getting easier to move - hope so.
If the axle moves light, check for the total range to move.

With the pot removed, the labor is easier.

Try to place the set on the face, just to remove the dirt which runs out of the
housing of the pot.
You can add gun oil, to prevent the pot from stucking again.

GOOD LUCK!

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