Grundig 9078 Speaker Connection - UK Vintage Radio Repair and Restoration Discussion Forum

johnny_prime · 3rd Aug 2019, 10:44 pm

Hello

I have recently restored a Grundig 9078 USA.

Was wondering if anyone can help and let me know what kind of speaker connections these are on the back?

Thank you.

TonyDuell · 4th Aug 2019, 5:45 am

If you mean what plug fits that socket, there were plugs used in continental Europe with 2 round pins to fit the socket contacts and either a round or flat unconnected pin between them. One reason for the unconnected pin was to prevent the plug being inserted in a mains wall socket (I am pretty sure it would fit otherwise, some manufacturers would 'park' the mains plug in, say the speaker socket for shipment).

Philips (and I guess others) had a convention where one type of unconnected pin was used on an input socket, the other on an output. I can't remember which was which but I can find out if anyone needs to know. Your socket has a central hole that would take either.

In any case, a pair of normal 4mm plugs will normally fit the active contact holes in said socket. Those are a lot easier to find than the odd European plug.

johnny_prime · 4th Aug 2019, 4:50 pm

Hello Tony

Thanks for the response.

I was thinking that one was for left and the other for the right hand side speaker. I guess this is just one speaker. Also just referenced the instruction book and it says a speaker may be used meaning just one. :-P

I'll use some 4mm and see what happens and let you know.

Thank you!

johnny_prime · 4th Aug 2019, 5:05 pm

Tony

It totally worked!

Thanks again!

3rd Aug 2019, 10:44 pm	#1
johnny_prime Retired Dormant Member Join Date: Feb 2019 Location: Toronto, Ontario, Canada Posts: 10	Grundig 9078 Speaker Connection Hello I have recently restored a Grundig 9078 USA. Was wondering if anyone can help and let me know what kind of speaker connections these are on the back? Thank you. Attached Thumbnails

4th Aug 2019, 5:45 am	#2
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,208	Re: Grundig 9078 Speaker Connection If you mean what plug fits that socket, there were plugs used in continental Europe with 2 round pins to fit the socket contacts and either a round or flat unconnected pin between them. One reason for the unconnected pin was to prevent the plug being inserted in a mains wall socket (I am pretty sure it would fit otherwise, some manufacturers would 'park' the mains plug in, say the speaker socket for shipment). Philips (and I guess others) had a convention where one type of unconnected pin was used on an input socket, the other on an output. I can't remember which was which but I can find out if anyone needs to know. Your socket has a central hole that would take either. In any case, a pair of normal 4mm plugs will normally fit the active contact holes in said socket. Those are a lot easier to find than the odd European plug.

4th Aug 2019, 4:50 pm	#3
johnny_prime Retired Dormant Member Join Date: Feb 2019 Location: Toronto, Ontario, Canada Posts: 10	Re: Grundig 9078 Speaker Connection Hello Tony Thanks for the response. I was thinking that one was for left and the other for the right hand side speaker. I guess this is just one speaker. Also just referenced the instruction book and it says a speaker may be used meaning just one. :-P I'll use some 4mm and see what happens and let you know. Thank you!

4th Aug 2019, 5:05 pm	#4
johnny_prime Retired Dormant Member Join Date: Feb 2019 Location: Toronto, Ontario, Canada Posts: 10	Re: Grundig 9078 Speaker Connection Tony It totally worked! Thanks again!