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Braun LV 1020 Repair and connecting

geg167

geg167

Active Member
Hi everyone. I have couple of questions about these speakers.
The woofers are in need of repair.
1. After watching "how to recon speakers" on youtube, I decided to try and repair them myself. How much does it matter what recon kit I buy fhttps://www.youtube.com/watch?v=lxGswEB3O_Q
2. Please help me understand how this speakers are connected to an amp! I've never seen those type or plugs.

Thanks
 

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Looks like proprietary DIN plugs for audio in and IEC plugs for power. The TO-3 transistors look awfully dangerous being uncovered like that.
 
ivandezande said:
Looks like proprietary DIN plugs for audio in and IEC plugs for power. The TO-3 transistors look awfully dangerous being uncovered like that.
Click to expand...
Could you elaborate please. Why is it dangerous? What cables does one use to connect them to an amp?
Thanks
 
These speakers have a built in amp. You connect them to a preamp. The transistors have 60V or so on the case. You should not touch them.
 
dr*audio said:
These speakers have a built in amp. You connect them to a preamp. The transistors have 60V or so on the case. You should not touch them.
Click to expand...

What if I do not run them through a preamp ? Can I run them through an amp?
How can I use these speakers with my PC if I don't have a preamp?
Thanks
 
geg167 said:
What if I do not run them through a preamp ? Can I run them through an amp?
How can I use these speakers with my PC if I don't have a preamp?
Thanks
Click to expand...

The speakers have their own volume controls. I can't remember if there is one on each speaker or only one control on one speaker. Anyway, you need to get an adapter or cable to go from whatever connector is on the end of the cable you show (plugged into the speaker) to a 3.5mm stereo plug, to plug into your computer. Then set the volume on the computer to about 1/4 the full level, to start, and set the volume on the speakers to a comfortable level. If you have to turn the speaker volume up all the way, increase the computer volume.
The only way you can connect these speakers up to an amplifier is to re-wire them. If you have an integrated amp (with volume control, and an input switch for tuner/ aux/ phono) or a receiver, you can connect these speakers to the preamp output jacks if the amp has them, or just use the tape output jacks.
 
dr*audio said:
The speakers have their own volume controls. I can't remember if there is one on each speaker or only one control on one speaker. Anyway, you need to get an adapter or cable to go from whatever connector is on the end of the cable you show (plugged into the speaker) to a 3.5mm stereo plug, to plug into your computer. Then set the volume on the computer to about 1/4 the full level, to start, and set the volume on the speakers to a comfortable level. If you have to turn the speaker volume up all the way, increase the computer volume.
The only way you can connect these speakers up to an amplifier is to re-wire them. If you have an integrated amp (with volume control, and an input switch for tuner/ aux/ phono) or a receiver, you can connect these speakers to the preamp output jacks if the amp has them, or just use the tape output jacks.
Click to expand...
Thanks, I have fisher 202-b. Do I still have to rewire the speakers?
 
geg167 said:
Thanks, I have fisher 202-b. Do I still have to rewire the speakers?
Click to expand...

If you want to drive these speakers with the tube output stage of this amp you have to remove the internal power amp in each speaker, build a 3 way crossover for each speaker, connect the crossover to the internal woofer, midrange and tweeter, then connect your Fisher amp to the input of each crossover.
If you just want to listen to the speakers using the amp as a signal source, connect the Record Outputs on the amp to the inputs on the speaker.
 
You are way beyond your knowledge level here. You would be way ahead moving on to something else. I am not being a wise guy but your questions show you do not have the knowledge to repair those speakers. How do you know the bass driver is bad ? Are the midrange and tweeter good? Are the amps good or do you need to bypass them?
Ed
 
@ EddyR
Hi, Eddy this was a rude reply. You are one of those who like to make people doubt their abilities. I hope you are not like that with your kids.
That's why I am here, starting this thread, asking people to help me.
The bass driver is bad because that's what the previous owner , who had a tech guy look at it, told me. I dont have the speaker yet. It should be in my possession in few hours now.
 
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geg167 said:
@ EddyR
Hi, Eddy this was a rude reply. You are one of those who like to make people doubt their abilities. I hope you are not like that with your kids.
That's why I am here, starting this thread, asking people to help me.
The bass driver is bad because that's what the previous owner , who had a tech guy look at it, told me. I dont have the speaker yet. It should be in my possession in few hours now.
Click to expand...


I think he had good intentions and there was some misinterpretation. By the questions you did (and didn't) ask, it does seem you are a little over your head with a project such as this.
 
Any idea what insulation did they use back than inside these speakers? I just opened them and see lots of insulation material behind the woofer. Hope it's not some sort of asbestos?!?!
 
geg167 said:
Any idea what insulation did they use back than inside these speakers? I just opened them and see lots of insulation material behind the woofer. Hope it's not some sort of asbestos?!?!
Click to expand...

I worked on a pair a few years ago. The insulation is not asbestos, it's fiberglas.
As to the surrounds, you should get a kit for this speaker if you can find one. If not, get a kit for ADS or Braun woofers of the same size. Braun became ADS.
 
dr*audio said:
I worked on a pair a few years ago. The insulation is not asbestos, it's fiberglas.
As to the surrounds, you should get a kit for this speaker if you can find one. If not, get a kit for ADS or Braun woofers of the same size. Braun became ADS.
Click to expand...

Thank you for your reply.

Fiberglass!!! wow. Still requires a mask to handle it! Am I correct?
 
geg167 said:
@ EddyR
Hi, Eddy this was a rude reply. You are one of those who like to make people doubt their abilities. I hope you are not like that with your kids.
Click to expand...

When my kids wanted to put their hand on the stove, I stopped them. This isn't about squelching your desire to learn at all. The LV1020 is a complicated beast to repair (on a good day) and definitely not what you want to learn on. Put it aside until you get more experience under your belt. The guy that learned how to repair Porsches likely started on a lawnmower first.
 
If I were you geg I would sell these and find some Braun or ADS L-710's, or L-810's and call it a day if you are hooked on that look and sound. They are terrific speakers; just connect them to your amp, receiver etc. and enjoy them. They are easy to restore if needed too.

The LV-1020 are a specialized beast and deserve a thorough and proper restore by someone who knows what they are doing.

Not being an a** just being honest like EddyR.

Good luck with them if you do tackle it your self. Take lots of pictures and ask questions.
 
soundmotor said:
When my kids wanted to put their hand on the stove, I stopped them. This isn't about squelching your desire to learn at all. The LV1020 is a complicated beast to repair (on a good day) and definitely not what you want to learn on. Put it aside until you get more experience under your belt. The guy that learned how to repair Porsches likely started on a lawnmower first.
Click to expand...

The stove and speakers are not comparable. There is no danger posed to others or yourself by playing with speakers, while it's completely different story with the stove!
I am not a beginner in repairing something and am pretty handy repairing staff. I was able to fix Fisher 202-B.
I absolutely agree with the fact that one has to start slow and gradually progress to more complicated problems.
 
dr*audio said:
These speakers have a built in amp. You connect them to a preamp. The transistors have 60V or so on the case. You should not touch them.
Click to expand...
Actually, they have three as they are tri-amped, one for each driver. Like other active speakers today, they are intended to be driven from a preamp source. I had a pair back in the 70s that sounded pretty decent. I ended up mounting the tweeter/midrange on a separate baffle above the cabinet a la Dahlquist. Since I worked for an A/D/S dealer at the time, I got a chance for Godehard Guenther to hear them.

Each driver has its own level control, but cranking all of them would only result in a highly colored response. Set them flat, adjust the level control to optimize the gain from the preamp. Adjust FR controls only as necessary.

Those are a bit rough looking.
 
Here the pics from the manual of that connector. Any idea what is the name for it?
 

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