New life for BeoVision Avant 32 VCR speaker & amp system? (Tech info required)

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Markkite (archived2)
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Posted October 4, 2015 at 11:54 GMT
#2050838

Hi,

I inherited a BeoVision Avant 32 VCR which was in need of work such that it wasn't financially viable.  (A lot more than getting a replacement off eBay!)

I hated to see it go to waste so I removed the speaker housings and the two amplifier boards, with the intent of re-using them to make a high quality sound system.

Does anyone have details of the power requirements for the amplifiers please, and pin-outs for the amplifier board inputs?

The amps power up with a nice healthy thud when I use a 12v supply, but I see that the on-board STK4122 II is happy with 17 - but I don't want to push it.

As for the inputs to the amps, I don't know if these are analog or digital - the latter might scupper my plans!  Any information / interface specs that someone would be willing to provide would be most appreciated.

Thanks in advance,

Mark

 

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Benjamin15 (archived2)
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Posted October 4, 2015 at 14:40 GMT
#2050839

I believe there was a similar project going on for the Avant a few months ago on the forum.

Have a search and see if you can find it.

Ben

AR
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argentas
Bronze
Posted October 4, 2015 at 15:02 GMT
#2050840

Hi Mark,

Welcome to beoworld.

I'm sure there were also some similar projects in the archived forum so worth searching there too (click on the Archived forum button at the top of the page). From memory you'll need a -20V/0V/+20V power supply plus an input to disable the muting circuit.

From an audio perspective, the amplifiers themselves take an analogue audio input so there should be no specific issues there.

Uprading your beoworld membership to (at least) Silver status gives you access to the service manuals which should help too.

Hope this helps,

Martin.

 

Location: Exeter, UK

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Markkite (archived2)
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Posted October 4, 2015 at 16:48 GMT
#2050841

Thanks Ben.

Following another post I tracked down the maintenance manuals... it looks like it shouldn't be too scary.

If I get it working I'll post details to the forum.  Such a shame to see good sound heading to the tip!

 

  Mark

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Benjamin15 (archived2)
Bronze
Posted October 4, 2015 at 16:50 GMT
#2050842

I agree, I adore my Avant and the sound is truly incredible even by today's standards!

Best of luck and keep us posted!

Ben

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Markkite (archived2)
Bronze
Posted October 4, 2015 at 16:52 GMT
#2050843

Thanks Martin.

****

Thankfully it looks like I scavenged the right bits, apart from the PSU, but I can arrange for something with that.

If I get this working to my satisfaction I'll post something to the forum explaining what I did.  As I mentioned to someone else who replied, it's a shame to send such a fine sound system to the tip.

Cheers,

Mark

 

*** Edit by Dillen

Beoworld moderator

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Newbie (archived2)
Bronze
Posted October 5, 2015 at 14:03 GMT
#2050844
Can't wait to see the result :-)
M(
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Markkite (archived2)
Bronze
Posted October 27, 2015 at 09:21 GMT
#2050845

No pictures just yet but there's progress.

My big issue has been with sourcing the +/-20v power supply so, thanks to PoundLand and £2 invested in four 9v batteries I have a temporary knock-up with sound coming out!

I'll sketch the circuit once I'm totally happy with it and post it and a few photos.  It's not that bad once you've a stable PSU.

I have a couple of spare PCs, each of which contains an ATX PSU capable of delivering +/-12v.  With some modification (GND is earthed) it should be possible to run these in series, and put the -12 -> +12 output of each of these through a regulator to bring them down to 20v each.  Either that or I'll release the blue smoke from the components and they won't ever work again, or wake up on hospital with bits of PSU embedded in my face.

It'll be worth the risk for the sound.  :)

 

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reprosteve (archived2)
Bronze
Posted October 27, 2015 at 12:54 GMT
#2050846

Hi

I've also got an avant in my in-laws garage waiting to be pulled apart, so I'm very interested in what your doing.

Would one of these work for power?

http://www.maplin.co.uk/p/lenovo-ac-adapter-65w-20v-includes-power-cable-r50df

Steve

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reprosteve (archived2)
Bronze
Posted October 27, 2015 at 12:54 GMT
#2050847

Hi

I've also got an avant in my in-laws garage waiting to be pulled apart, so I'm very interested in what your doing.

Would one of these work for power?

http://www.maplin.co.uk/p/lenovo-ac-adapter-65w-20v-includes-power-cable-r50df

Steve

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