Audio In Connection on Grundig Concert Boy 1100 - UK Vintage Radio Repair and Restoration Discussion Forum

RadioBobbie · 7th Jan 2021, 10:36 pm

Hello!

I have inherited an old Grundig Concert Boy 1100, which works beautifully. I would like to plug through its audio-in a bluetooth receiver, to stream music from my computer.

I cannot find the manual for the radio anywhere; can anybody knowledgeable about this model let me know what kind of connector will work on this radio? It seems to be using a DIN 5 connector, but I am not sure if I am right about it.

Thanks!

agardiner · 7th Jan 2021, 11:09 pm

Hello and welcome to the forum.

Yes, your radio has a 5 pin din style socket in it which can be used. It allows audio out (for a tape recorder) and audio in by selecting it.

Plenty of cheap cables on ebay which should work. Assuming you want the other end as a 3.5mm jack, then they often show up as a midi cable which will still be fine.

RadioBobbie · 8th Jan 2021, 3:01 am

Agardiner, thank you for your help and for your welcome!

I have ordered one of those cables now, it should be here soon.

Thanks!

RadioBobbie · 20th Jan 2021, 7:23 pm

Hello!

Sorry to bother again. I bought a cable, this one in particular (sorry, the page is in dutch) https://www.onlinekabelshop.nl/cavus...-zwart-3-meter but unfortunately it does not seem to work with my Concert Boy 1100. I also have another Concert Boy model with the same connection and it does not work there, either.

I only hear a generic hum when I connect the cable to one radio; and a hum with some barely audible sound in the other radio.

Do you think the problem is the cable or the radio plug is broken on both radios?

Thanks!

G6ONEDave · 21st Jan 2021, 11:59 am

According to the circuit diagram the 5pin DIN socket is wired as; 1 and 4 are tape output for recording from the radio. Connections 3 and 5 are tape input, so that a tape or other external audio source can be heard through the radio when the tape button is selected. The radio is mono so 1 and 4 are internally joined together and likewise 3 and 5 are also internally joined together.
Dave

RadioBobbie · 21st Jan 2021, 3:46 pm

Thank you Dave! So I suppose the cable I have should work, but I will do some more tests.

G6ONEDave · 21st Jan 2021, 6:38 pm

The cable that you have might well be connected wrongly for the radio. Being stereo it could be using pins 3 and 5, which won't produce tape playback sound from the radio unless one of the radio band selections is operated. If I am correct then in tape mode the cable is effectively being disconnected from the radio amplifier. If the DIN plug is rewirable, then it's simply a case of swapping over the wires in the DIN plug. If the cable has a moulded on DIN, it will need to be replaced with a solder on type or another cable that has two 3.5mm jack plugs, to give both input and output connections.
Dave

agardiner · 21st Jan 2021, 7:04 pm

Quote:

Originally Posted by RadioBobbie

Hello!

Sorry to bother again. I bought a cable, this one in particular (sorry, the page is in dutch) https://www.onlinekabelshop.nl/cavus...-zwart-3-meter but unfortunately it does not seem to work with my Concert Boy 1100. I also have another Concert Boy model with the same connection and it does not work there, either.

I only hear a generic hum when I connect the cable to one radio; and a hum with some barely audible sound in the other radio.

Do you think the problem is the cable or the radio plug is broken on both radios?

Thanks!

Sorry the cable you bought didn't work straight away. If the radio is otherwise working then as said by Dave the wiring must be incorrect on the DIN plug. Hopefully you can alter?

RadioBobbie · 26th Jan 2021, 1:55 am

Thanks guys, I am trying too! I am bit under-equipped as I am not really an expert on this stuff, I inherited these radios, but I will do my best!

And sorry for the late reply, I really appreciate your help and knowledge, I was just too busy juggling too much work in the past days.

7th Jan 2021, 10:36 pm	#1
RadioBobbie Diode Join Date: Jan 2021 Location: Rotterdam, Netherlands Posts: 5	Audio In Connection on Grundig Concert Boy 1100 Hello! I have inherited an old Grundig Concert Boy 1100, which works beautifully. I would like to plug through its audio-in a bluetooth receiver, to stream music from my computer. I cannot find the manual for the radio anywhere; can anybody knowledgeable about this model let me know what kind of connector will work on this radio? It seems to be using a DIN 5 connector, but I am not sure if I am right about it. Thanks!

7th Jan 2021, 11:09 pm	#2
agardiner Octode Join Date: Sep 2020 Location: Thetford, Norfolk, UK. Posts: 1,743	Re: Audio In Connection on Grundig Concert Boy 1100 Hello and welcome to the forum. Yes, your radio has a 5 pin din style socket in it which can be used. It allows audio out (for a tape recorder) and audio in by selecting it. Plenty of cheap cables on ebay which should work. Assuming you want the other end as a 3.5mm jack, then they often show up as a midi cable which will still be fine.

8th Jan 2021, 3:01 am	#3
RadioBobbie Diode Join Date: Jan 2021 Location: Rotterdam, Netherlands Posts: 5	Re: Audio In Connection on Grundig Concert Boy 1100 Agardiner, thank you for your help and for your welcome! I have ordered one of those cables now, it should be here soon. Thanks!

20th Jan 2021, 7:23 pm	#4
RadioBobbie Diode Join Date: Jan 2021 Location: Rotterdam, Netherlands Posts: 5	Re: Audio In Connection on Grundig Concert Boy 1100 Hello! Sorry to bother again. I bought a cable, this one in particular (sorry, the page is in dutch) https://www.onlinekabelshop.nl/cavus...-zwart-3-meter but unfortunately it does not seem to work with my Concert Boy 1100. I also have another Concert Boy model with the same connection and it does not work there, either. I only hear a generic hum when I connect the cable to one radio; and a hum with some barely audible sound in the other radio. Do you think the problem is the cable or the radio plug is broken on both radios? Thanks!

21st Jan 2021, 11:59 am	#5
G6ONEDave Octode Join Date: Dec 2019 Location: Owston Ferry, North Lincolnshire, UK. Posts: 1,704	Re: Audio In Connection on Grundig Concert Boy 1100 According to the circuit diagram the 5pin DIN socket is wired as; 1 and 4 are tape output for recording from the radio. Connections 3 and 5 are tape input, so that a tape or other external audio source can be heard through the radio when the tape button is selected. The radio is mono so 1 and 4 are internally joined together and likewise 3 and 5 are also internally joined together. Dave

21st Jan 2021, 3:46 pm	#6
RadioBobbie Diode Join Date: Jan 2021 Location: Rotterdam, Netherlands Posts: 5	Re: Audio In Connection on Grundig Concert Boy 1100 Thank you Dave! So I suppose the cable I have should work, but I will do some more tests.

21st Jan 2021, 6:38 pm	#7
G6ONEDave Octode Join Date: Dec 2019 Location: Owston Ferry, North Lincolnshire, UK. Posts: 1,704	Re: Audio In Connection on Grundig Concert Boy 1100 The cable that you have might well be connected wrongly for the radio. Being stereo it could be using pins 3 and 5, which won't produce tape playback sound from the radio unless one of the radio band selections is operated. If I am correct then in tape mode the cable is effectively being disconnected from the radio amplifier. If the DIN plug is rewirable, then it's simply a case of swapping over the wires in the DIN plug. If the cable has a moulded on DIN, it will need to be replaced with a solder on type or another cable that has two 3.5mm jack plugs, to give both input and output connections. Dave

26th Jan 2021, 1:55 am	#9
RadioBobbie Diode Join Date: Jan 2021 Location: Rotterdam, Netherlands Posts: 5	Thanks guys, I am trying too! I am bit under-equipped as I am not really an expert on this stuff, I inherited these radios, but I will do my best! And sorry for the late reply, I really appreciate your help and knowledge, I was just too busy juggling too much work in the past days.