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Amplifiers Rescue Gods |
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KDW32 
Young Croc 
Joined: 09 April 2010 Location: Green Hell Status: Offline Points: 541 |
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 Posted: 20 January 2024 at 4:18pm |
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Is a HH VX900 worth resurrecting? It's got one channel down. Not opened it yet. I found it on a wall with a some plates being given for free a long time ago and gave it a mate. It's made it's way back to me. I never used them back in the early 90s when I stared.
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EmPro
Young Croc
Joined: 26 June 2020 Status: Offline Points: 766 |
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Posted: 20 January 2024 at 3:50pm |
I just finished the bench test for it and the results are as follow: -27.40v rms 4R measured in 50hz 100hz and 1000hz sinewave (no clipping) -31.80v rms hard clipping Both measurement shows the same values on HPS 5 osciloscope and Fluke multimeter. Both ch shows same behavior,i test them one by one,not at the same time...so both ch driveing at the same time will push no less than 180w rms clean :) i was surprised to see how good response i got in 50hz from such a small toy
 Edited by EmPro - 20 January 2024 at 3:52pm |
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EmPro Audio
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Wikl109
Young Croc
Joined: 29 April 2009 Location: Yorkshire Status: Offline Points: 969 |
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Posted: 15 January 2024 at 10:23pm |
I'm pretty certain that looks like the broken one after it's been repaired. Look at the scorch marks on the board around a couple of those resistors. It has cleaned up pretty well. 
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Cheers, Chris.
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Lucasdude
Young Croc
Joined: 16 March 2013 Location: London Status: Offline Points: 827 |
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Posted: 15 January 2024 at 9:48pm |
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I'm kinda guessing that last pic is the working one...
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Earplug
Old Croc 
Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216 |
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Posted: 15 January 2024 at 6:35pm |
Ditto.  |
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Earplugs Are For Wimps!
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EmPro
Young Croc
Joined: 26 June 2020 Status: Offline Points: 766 |
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Posted: 15 January 2024 at 6:29pm |
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Nice work and proper done
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EmPro Audio
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kedwardsleisure
Old Croc
Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4949 |
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Posted: 15 January 2024 at 5:52pm |
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It's one of a rack of these so it's nice to keep everything the same I suppose.
Only 1 channel down, the amp was happily still operating on the other 3 channels. 
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Kevin
North Staffordshire |
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jbl_man
Moderator Group 
Joined: 12 January 2005 Location: London. Status: Offline Points: 11155 |
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Posted: 15 January 2024 at 2:51pm |
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Was it just this one channel board Kevin, the other 3 are ok?
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Be seeing you.
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Earplug
Old Croc
Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216 |
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Posted: 15 January 2024 at 1:25pm |
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Ok, but that PCB does look pretty fooked! I suppose you can clean up & repair if the owner has enough love for the thing. What are the tracks on the other side like? Also badly damaged? That can often be the biggest PITA.  |
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Earplugs Are For Wimps!
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kedwardsleisure
Old Croc
Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4949 |
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Posted: 15 January 2024 at 1:11pm |
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crikey no, it's only 27 years old, plenty of life left in these old swedes
Edited by kedwardsleisure - 15 January 2024 at 1:11pm |
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Kevin
North Staffordshire |
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Earplug
Old Croc
Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216 |
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Posted: 12 January 2024 at 1:50pm |
Weigh it in for the copper! |
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Earplugs Are For Wimps!
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EmPro
Young Croc
Joined: 26 June 2020 Status: Offline Points: 766 |
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Posted: 12 January 2024 at 12:54pm |
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ohh,that lab have seen better days
 so...vas stage,drivers and outputs 
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EmPro Audio
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jbl_man wrote: