Osram Music Magnet 4 - UK Vintage Radio Repair and Restoration Discussion Forum

jomacot · 23rd Jul 2018, 5:45 pm

Hi All,

I've been given a vintage radio by my son as a birthday present.
He says the guy that sold it to him insists it works.
Well maybe, but I have no information as to how to connect up the batteries, antenna and speaker because I do not have a diagram showing me what all the screw terminals are at the rear of the set.

Does anyone have access to anything approaching a user manual for this radio.
I've found a circuit diagram with a brief description in German but's more of a general guide to it's performance than a technical handbook.

Cheers all.

Jomacot.

dave walsh · 23rd Jul 2018, 6:19 pm

It's quite possible you will not have the skill set for this early receiver Jomacot.
You can access threads on here via "search this site" above eg "Osram 4 Music magnet by tigger" 10/7/12. These should give you an outline of what may be involved. Hope that helps.

Dave W

ms660 · 23rd Jul 2018, 6:22 pm

http://www.electrojumble.org/DATA/Mu..._4_with_AC.pdf

?

Lawrence.

Cobaltblue · 23rd Jul 2018, 7:32 pm

Just to add to Lawrences excellent link

https://www.radiomuseum.org/r/genera..._magnet_4.html

Cheers

Mike T

AC/HL · 23rd Jul 2018, 7:40 pm

Back then there were no operating or service manuals. You got the build instructions on full size sheets, that's it. Radio was for the practical enthusiast, likely as not a member of a radio club.
There are two versions, the Music Magnet and the New Music Magnet, to make sure which one you have could you post a picture of the inside with the lid up.
Either way, you will need several batteries. A 2 volt accumulator, an HT battery and a grid bias battery. As Dave says, the search box above will be useful for research. No plug and play in the 20s unfortunately. Oh, and a long wire aerial, but that can come later.

PJL · 23rd Jul 2018, 7:45 pm

These are pretty simple sets. Can you post a picture of the bits you have and maybe we can help.

Ed_Dinning · 23rd Jul 2018, 8:38 pm

Hi you will also need a high impedance loudspeaker failing that you can use a low impedance speaker from a valve set, but with its matching transformer.
The basic kit set was just that, and you needed batteries, valves and a speaker and aerial to get it going.
I have some of these sets and they will operate well on local stations.

Ed

paulsherwin · 23rd Jul 2018, 10:04 pm

I agree with #2. This will be a challenging radio for a beginner, and there's not a lot of stuff to listen to on the AM broadcast bands anyway. Maybe it would be better to treat it as a static exhibit?

jomacot · 25th Jul 2018, 8:20 am

Thanks all for the excellent info. It may well be that it ends up as an ornament but initially I will try to get it working.
I have added two pics of the beast.
Incidentally, I have seen a rather battered one in an antique shop and it had a flat battery clipped to the right hand side, the pics show the clips on my one.

AC/HL · 25th Jul 2018, 11:22 am

Definitely a New Music Magnet. The flat battery is the grid bias battery, inside because they last a long time as there is no drain from them. The 2 volt accumulator and large HT battery would be hidden away, possibly in another cabinet.
There are several threads on here (use the search box above) and quite a lot in other sites. If you pull off those aluminium cans there should be a valve under each one.
Do you have any test equipment, primarily a multimeter?

jomacot · 26th Jul 2018, 12:23 pm

Thanks, Yes I have both digital and analogue meters.
I downloaded the info from the link from ms660 which was great but still need to identify the screw terminals though so will study and see what I can deduce.
What voltage is the HT battery?

AC/HL · 26th Jul 2018, 3:13 pm

This is the construction sheet:

AC/HL · 26th Jul 2018, 3:16 pm

Continued:

If you PM your email address I'll send them without the size reduction if required.

jomacot · 29th Jul 2018, 12:45 pm

AC/HL.

Sorry PM?

Station X · 29th Jul 2018, 2:48 pm

Private Message.

Click on AC/HL's username and select the appropriate option from the drop down menu.

AC/HL · 29th Jul 2018, 8:16 pm

Thanks Graham, email now sent.

23rd Jul 2018, 5:45 pm	#1
jomacot Diode Join Date: Jul 2018 Location: Saffron Walden, Essex, UK. Posts: 4	Osram Music Magnet 4 Hi All, I've been given a vintage radio by my son as a birthday present. He says the guy that sold it to him insists it works. Well maybe, but I have no information as to how to connect up the batteries, antenna and speaker because I do not have a diagram showing me what all the screw terminals are at the rear of the set. Does anyone have access to anything approaching a user manual for this radio. I've found a circuit diagram with a brief description in German but's more of a general guide to it's performance than a technical handbook. Cheers all. Jomacot.

23rd Jul 2018, 6:22 pm	#3
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Osram Music Magnet 4 http://www.electrojumble.org/DATA/Mu..._4_with_AC.pdf ? Lawrence.

23rd Jul 2018, 7:32 pm	#4
Cobaltblue Moderator Join Date: Dec 2010 Location: Exeter, Devon and Poole, Dorset UK. Posts: 6,879	Re: Osram Music Magnet 4 Just to add to Lawrences excellent link https://www.radiomuseum.org/r/genera..._magnet_4.html Cheers Mike T __________________ Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk

23rd Jul 2018, 7:40 pm	#5
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,642	Re: Osram Music Magnet 4 Back then there were no operating or service manuals. You got the build instructions on full size sheets, that's it. Radio was for the practical enthusiast, likely as not a member of a radio club. There are two versions, the Music Magnet and the New Music Magnet, to make sure which one you have could you post a picture of the inside with the lid up. Either way, you will need several batteries. A 2 volt accumulator, an HT battery and a grid bias battery. As Dave says, the search box above will be useful for research. No plug and play in the 20s unfortunately. Oh, and a long wire aerial, but that can come later.

23rd Jul 2018, 7:45 pm	#6
PJL Dekatron Join Date: Sep 2005 Location: Seaford, East Sussex, UK. Posts: 5,997	Re: Osram Music Magnet 4 These are pretty simple sets. Can you post a picture of the bits you have and maybe we can help.

23rd Jul 2018, 6:19 pm	#2
dave walsh Dekatron Join Date: Jan 2006 Location: Ramsbottom (Nr Bury) Lancs or Bexhill (Nr Hastings) Sussex. Posts: 5,817	Re: Osram Music Magnet 4 It's quite possible you will not have the skill set for this early receiver Jomacot. You can access threads on here via "search this site" above eg "Osram 4 Music magnet by tigger" 10/7/12. These should give you an outline of what may be involved. Hope that helps. Dave W

23rd Jul 2018, 8:38 pm	#7
Ed_Dinning Dekatron Join Date: Jan 2004 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 8,195	Re: Osram Music Magnet 4 Hi you will also need a high impedance loudspeaker failing that you can use a low impedance speaker from a valve set, but with its matching transformer. The basic kit set was just that, and you needed batteries, valves and a speaker and aerial to get it going. I have some of these sets and they will operate well on local stations. Ed

23rd Jul 2018, 10:04 pm	#8
paulsherwin Moderator Join Date: Jun 2003 Location: Oxford, UK Posts: 27,970	Re: Osram Music Magnet 4 I agree with #2. This will be a challenging radio for a beginner, and there's not a lot of stuff to listen to on the AM broadcast bands anyway. Maybe it would be better to treat it as a static exhibit?

25th Jul 2018, 8:20 am	#9
jomacot Diode Join Date: Jul 2018 Location: Saffron Walden, Essex, UK. Posts: 4	Re: Osram Music Magnet 4 Thanks all for the excellent info. It may well be that it ends up as an ornament but initially I will try to get it working. I have added two pics of the beast. Incidentally, I have seen a rather battered one in an antique shop and it had a flat battery clipped to the right hand side, the pics show the clips on my one. Attached Thumbnails

25th Jul 2018, 11:22 am	#10
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,642	Re: Osram Music Magnet 4 Definitely a New Music Magnet. The flat battery is the grid bias battery, inside because they last a long time as there is no drain from them. The 2 volt accumulator and large HT battery would be hidden away, possibly in another cabinet. There are several threads on here (use the search box above) and quite a lot in other sites. If you pull off those aluminium cans there should be a valve under each one. Do you have any test equipment, primarily a multimeter?

26th Jul 2018, 12:23 pm	#11
jomacot Diode Join Date: Jul 2018 Location: Saffron Walden, Essex, UK. Posts: 4	Re: Osram Music Magnet 4 Thanks, Yes I have both digital and analogue meters. I downloaded the info from the link from ms660 which was great but still need to identify the screw terminals though so will study and see what I can deduce. What voltage is the HT battery?

26th Jul 2018, 3:13 pm	#12
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,642	Re: Osram Music Magnet 4 This is the construction sheet: Attached Thumbnails

26th Jul 2018, 3:16 pm	#13
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,642	Re: Osram Music Magnet 4 Continued: If you PM your email address I'll send them without the size reduction if required. Attached Thumbnails

29th Jul 2018, 12:45 pm	#14
jomacot Diode Join Date: Jul 2018 Location: Saffron Walden, Essex, UK. Posts: 4	Re: Osram Music Magnet 4 AC/HL. Sorry PM?

29th Jul 2018, 2:48 pm	#15
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: Osram Music Magnet 4 Private Message. Click on AC/HL's username and select the appropriate option from the drop down menu. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

29th Jul 2018, 8:16 pm	#16
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,642	Re: Osram Music Magnet 4 Thanks Graham, email now sent.