Amp Internals 2 |
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The Builder
Old Croc Joined: 03 January 2010 Status: Offline Points: 3107 |
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Samson SX3200
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Stated as 1100watts at 4 ohms 15hk-40khz
Used to be 1600 @ 2r, now they dont say that!
Admitting defeat and being honest, I'd say thats cool. MUCH too expensive new.
I have accumulated:
2 x 3200
1 x 2800
2 x 1800
For a total of less than £550. All used, but hardly and in good nick.
Cooll as hell @ 4r on sub.
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It just is.
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kedwardsleisure
Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4938 |
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Well I've got a 50Mhz scope and with the timebase cranked up to full it was still showing a load of rubbish. What an expensive way to ruin a Marshall amp head.
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Kevin
North Staffordshire |
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kedwardsleisure
Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4938 |
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Marshall 100W lead & bass amplifier head
And the nasty home made mosfet replacement amp board that lay inside on veroboard (components on both sides of the board!) And it's predictably dire attempt to reproduce a sine wave. |
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Kevin
North Staffordshire |
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kedwardsleisure
Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4938 |
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If you mean my video, that was a Crown MA12000i that has developed a mind of its own, having disgraced itself at several gigs already. At around 3 years old, you dont get much for 5 grand! Think of an XTi crossed with a laptop motherboard and a malevolent poltergeist and you get the idea.
Edited by kedwardsleisure - 14 September 2011 at 11:20pm |
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Kevin
North Staffordshire |
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burningbush
Old Croc Joined: 25 May 2009 Location: Pictland Status: Offline Points: 5897 |
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Ed, what the hell was going on with that Peavey? Was that random fan speeds or is it trying to communicate with you?
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music is the message
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kedwardsleisure
Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4938 |
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Either way, I think its emissions may have temporarily disabled a few satellites this afternoon.
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Kevin
North Staffordshire |
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kedwardsleisure
Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4938 |
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Kevin
North Staffordshire |
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nineleaves
Young Croc Joined: 31 August 2007 Status: Offline Points: 1327 |
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yup, looks like its doing what ...about 10mhz ? from what i remember of these things going into oscillation ?
Mind, the emissions that some allegedly working perfectly fine class-d's are scary.. definately not meeting emissions laws and regs ;) ..funny world we live in :) |
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burningbush
Old Croc Joined: 25 May 2009 Location: Pictland Status: Offline Points: 5897 |
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Did they not let the cleaner evaporate first before switch on?
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music is the message
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nineleaves
Young Croc Joined: 31 August 2007 Status: Offline Points: 1327 |
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without digging the schematics up, looks vaguely reminiscent of the maplin mosfet design.
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burningbush
Old Croc Joined: 25 May 2009 Location: Pictland Status: Offline Points: 5897 |
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music is the message
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ceharden
The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776 |
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Had that issue today, not from a class D, just a cheap switchmode amp. Was using my FM radio as the signal source to run it up but as I turned the amp up, the radio reception got worse! Not the first time. Unfortunately I don't own an RF spectrum analyser to find out what it's spewing out.
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