Telefunken Concertino Stereo 2194 - UK Vintage Radio Repair and Restoration Discussion Forum

prajan · 15th Dec 2013, 3:53 pm

Dear friends

I am in the process of restoring the above set. I am in need of the top and bottom component layout drawing for the above set. Can somebody help me?

Regards

P.Rajan

orbanp1 · 15th Dec 2013, 5:32 pm

Here is the service manual for the radio, but it does not have the part layout drawings: http://elektrotanya.com/telefunken_c.../download.html
I am sure that with the info in there you can figure out the layout.

Peter

prajan · 16th Dec 2013, 1:12 pm

Dear Mr. Peter

Thanks for your reply. I already have the service manual as given by you but I needed the layout drawings.

Regards

P.Rajan

orbanp1 · 16th Dec 2013, 3:32 pm

I guess there are no published factory layout drawings. The manual shown at the RM site is identical to the one you have.
SAMS does not cover the radio either.
Looks like your best bet is to find some with the same radio and ask him to take pictures for you.

Regards, Peter

bobbyball · 16th Dec 2013, 7:02 pm

I am away from home but I think I might have this model.

I will look when I get home.

howard · 16th Dec 2013, 7:32 pm

Hello,

Coincidentally I am restoring one of these, repairing its metal rectifier at this very moment. All that I am working from is the circuit diagram that came with the set which was tucked into an envelope stuck on the inside of the rear cover. I am not aware of any component layout schematics for this set, there are none in the Telefunken service manual on the RadioMuseum.

http://www.radiomuseum.org/r/telefun...no_2194_1.html

Howard

Nickthedentist · 16th Dec 2013, 8:58 pm

...so best to make your own, Mr Rajan.

Take a good digital photo of both sides of the chassis, then print them with your printer set to its draft setting so you get a fairly pale image. Then get out your circuit diagram and a bright light to examine the chassis, and spend an hour or two annotating your photo with a fine pen, one colour for Cs, another for Rs etc. Not the most exciting job in the world, but it will help you no end in the long run.

Nick.

prajan · 20th Dec 2013, 8:00 am

Dear Friends

Thanks for all the replies. I can make the bottom side layout drawing which is not very complicated. But the top side is complicated and not easy to draw. Even the schematic is also not user friendly. Firstly it is in German language. Secondly they have used different types of notations. On one side the audio stage is a Push Pull amplifier and on the other side it is a Stereo amplifier. Only single ECL86 has been used for both the channels. The output transformer is also special and not simple to follow. The set in which I am working, some changes may have been done by some technician. One of them which I noticed is instead of 100Mfd filter condenser someone has replaced it by 47mfd condenser. So I suspect there could be some other changes also. Before applying power I want to be sure that all the components are in place and are of original values. Even a good photo of the top and bottom side could be helpful.

Regards

P.Rajan

Freya · 20th Dec 2013, 10:43 am

Its audio section runs push-pull below frequencies of 300 Hz (in stereo mode). Make sure the Trimmer W66, is adjusted properly.
The output stage s in the set are a little unusual, and ECL86`s are easily damaged if the grid coupling capacitors are shorted.
#also note smoother C65 is 100uF and C66 is 50uF, it could be the 47uF you are seeing a replacement for the 50uF ?

prajan · 21st Dec 2013, 6:15 am

Dear Mr. Stephen

Thanks your reply.
1.There was a mistake on my part in noticing the changes done. The capacitor C65 100ufd has been changed by two capacitors each of 47ufd totaling to 94ufd which seems to be O.K. The capacitor C66 has been replaced by a 47ufd capacitor. But after rechecking I noticed that the capacitors C57 and C157 which as per schematic are 50ufd capacitors have been replaced by 100ufd capacitors. What will be the effect oh this? Should I replace it by 47ufd capacitors?
2. You have mentioned about the grid coupling capacitor to the valve ECL86. Are these the capacitors C58 and C154 of value 0.01ufd? If these are the capacitors then I will check them for any leakage when I apply the power.
3. Is the total value of the resistance W65+ W66 to be adjusted to 18K or the same value as W67-18K. Due to age there could be a change in the value of W67. So should I measure the actual value of W67 and adjust W66 so that the combined value of W65 and W66 is the same as the measured value of W67?

Regards

P.Rajan

15th Dec 2013, 3:53 pm	#1
prajan Pentode Join Date: Jul 2006 Location: Bangalore, India Posts: 104	Telefunken Concertino Stereo 2194 Dear friends I am in the process of restoring the above set. I am in need of the top and bottom component layout drawing for the above set. Can somebody help me? Regards P.Rajan

15th Dec 2013, 5:32 pm	#2
orbanp1 Heptode Join Date: Nov 2009 Location: London, Ontario, Canada Posts: 675	Re: Telefunken concertino stereo 2194 Here is the service manual for the radio, but it does not have the part layout drawings: http://elektrotanya.com/telefunken_c.../download.html I am sure that with the info in there you can figure out the layout. Peter

16th Dec 2013, 1:12 pm	#3
prajan Pentode Join Date: Jul 2006 Location: Bangalore, India Posts: 104	Re: Telefunken Concertino Stereo 2194 Dear Mr. Peter Thanks for your reply. I already have the service manual as given by you but I needed the layout drawings. Regards P.Rajan

16th Dec 2013, 3:32 pm	#4
orbanp1 Heptode Join Date: Nov 2009 Location: London, Ontario, Canada Posts: 675	Re: Telefunken Concertino Stereo 2194 I guess there are no published factory layout drawings. The manual shown at the RM site is identical to the one you have. SAMS does not cover the radio either. Looks like your best bet is to find some with the same radio and ask him to take pictures for you. Regards, Peter

16th Dec 2013, 7:02 pm	#5
bobbyball Octode Join Date: Jul 2011 Location: Stockport, Greater Manchester Posts: 1,217	Re: Telefunken Concertino Stereo 2194 I am away from home but I think I might have this model. I will look when I get home. __________________ Robert

16th Dec 2013, 7:32 pm	#6
howard Nonode Join Date: May 2005 Location: Godalming, Surrey, UK. Posts: 2,593	Re: Telefunken Concertino Stereo 2194 Hello, Coincidentally I am restoring one of these, repairing its metal rectifier at this very moment. All that I am working from is the circuit diagram that came with the set which was tucked into an envelope stuck on the inside of the rear cover. I am not aware of any component layout schematics for this set, there are none in the Telefunken service manual on the RadioMuseum. http://www.radiomuseum.org/r/telefun...no_2194_1.html Howard Attached Thumbnails

16th Dec 2013, 8:58 pm	#7
Nickthedentist Dekatron Join Date: Jan 2005 Location: Oxford, UK. Posts: 17,865	Re: Telefunken Concertino Stereo 2194 ...so best to make your own, Mr Rajan. Take a good digital photo of both sides of the chassis, then print them with your printer set to its draft setting so you get a fairly pale image. Then get out your circuit diagram and a bright light to examine the chassis, and spend an hour or two annotating your photo with a fine pen, one colour for Cs, another for Rs etc. Not the most exciting job in the world, but it will help you no end in the long run. Nick.

20th Dec 2013, 8:00 am	#8
prajan Pentode Join Date: Jul 2006 Location: Bangalore, India Posts: 104	Re: Telefunken Concertino Stereo 2194 Dear Friends Thanks for all the replies. I can make the bottom side layout drawing which is not very complicated. But the top side is complicated and not easy to draw. Even the schematic is also not user friendly. Firstly it is in German language. Secondly they have used different types of notations. On one side the audio stage is a Push Pull amplifier and on the other side it is a Stereo amplifier. Only single ECL86 has been used for both the channels. The output transformer is also special and not simple to follow. The set in which I am working, some changes may have been done by some technician. One of them which I noticed is instead of 100Mfd filter condenser someone has replaced it by 47mfd condenser. So I suspect there could be some other changes also. Before applying power I want to be sure that all the components are in place and are of original values. Even a good photo of the top and bottom side could be helpful. Regards P.Rajan

20th Dec 2013, 10:43 am	#9
Freya Octode Join Date: Jan 2009 Location: Falmouth, Cornwall, UK. Posts: 1,991	Re: Telefunken Concertino Stereo 2194 Its audio section runs push-pull below frequencies of 300 Hz (in stereo mode). Make sure the Trimmer W66, is adjusted properly. The output stage s in the set are a little unusual, and ECL86`s are easily damaged if the grid coupling capacitors are shorted. #also note smoother C65 is 100uF and C66 is 50uF, it could be the 47uF you are seeing a replacement for the 50uF ? __________________ Stephen _________"It`s only an old telly" ___ Last edited by Freya; 20th Dec 2013 at 10:53 am.

21st Dec 2013, 6:15 am	#10
prajan Pentode Join Date: Jul 2006 Location: Bangalore, India Posts: 104	Re: Telefunken Concertino Stereo 2194 Dear Mr. Stephen Thanks your reply. 1.There was a mistake on my part in noticing the changes done. The capacitor C65 100ufd has been changed by two capacitors each of 47ufd totaling to 94ufd which seems to be O.K. The capacitor C66 has been replaced by a 47ufd capacitor. But after rechecking I noticed that the capacitors C57 and C157 which as per schematic are 50ufd capacitors have been replaced by 100ufd capacitors. What will be the effect oh this? Should I replace it by 47ufd capacitors? 2. You have mentioned about the grid coupling capacitor to the valve ECL86. Are these the capacitors C58 and C154 of value 0.01ufd? If these are the capacitors then I will check them for any leakage when I apply the power. 3. Is the total value of the resistance W65+ W66 to be adjusted to 18K or the same value as W67-18K. Due to age there could be a change in the value of W67. So should I measure the actual value of W67 and adjust W66 so that the combined value of W65 and W66 is the same as the measured value of W67? Regards P.Rajan