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Old 24th May 2015, 09:40 AM   #1
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Join Date: Dec 2014
Location: West Coast - Norway
Default Caught on fire - Phoenix Gold Outlaw

Hi all.

Currently working on a disaster of an amp - Phoenix Gold Outlaw.
As you can see from images below - this doesn't look good.

20150511_211641780_iOS.jpg
20150520_160050995_iOS.jpg

The M50 board is totally gone - at least for me. Waiting for a spare board.
The M100 board does turn on - but the amp/board itself produce a high pitch tone.
Not sure where to start troubleshooting this one.
I've put together two videos on Youtube. First one showing the power on after cleaning the board. I did power it on without a heatsink - with bias turned all the way down on both ch.
https://www.youtube.com/watch?v=F15eWxlCyaE

Since I was getting a clean wave with my portable scope - and no offset (< 5mV both ch) - I then recorded the second video with music playing. Board heatsinked and rebiased. Hopefully you'll hear the same as me.
The sound/tone reminds me of hearing tests in my youth.
https://www.youtube.com/watch?v=nJFBfsrq0ME

Any ideas?
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Old 27th May 2015, 03:54 PM   #2
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Location: Texas
Is the noise coming from the transformer? Perhaps a loose winding (not common for PG though)
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Tek 465, Fluke 111, TPI 440, AudioAuthority 2/77 Power Supply, Alpine HU for signal or Eico 379 Sine/Square Wave Generator.

Last edited by evianamp2011; 27th May 2015 at 03:58 PM.
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Old 2nd June 2015, 02:38 AM   #3
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judging by the amount of charring on the 2nd board, you need to change them both. that carbonization is conductive. It is pretty much a total loss as it is.
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Old 10th June 2015, 06:25 AM   #4
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Sorry all for this late update - been busy as hell these last weeks.

Thank you all for you input.

So - the high pitch sound is no more present in the M100 board. I believe it has to do something with conductivity as mbates mentioned, as I've not changed anything on the board other than the input caps and verifying the rail caps with my ESR meter. Cleaned the board with isopropyl (it looks far better - but not 100%) - focusing on mounting area of nearly every component. Hopefully it cured it - time will tell.

What remains now is to figure out the popping sound through the speakers when applying remote power.

I also believe this board is a total loss. It does play - but the smell from the M50 fire is still noticable when it heats up. I'll have to talk to the owner on what to do
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Old 12th June 2015, 04:56 AM   #5
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Did you replace all the caps or just the B+ filter caps?
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Tek 465, Fluke 111, TPI 440, AudioAuthority 2/77 Power Supply, Alpine HU for signal or Eico 379 Sine/Square Wave Generator.
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Old 12th June 2015, 06:04 AM   #6
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Only changed the input caps (B+) - Nichicon 5600uF 16V.
The rails caps measured OK with my ESR meter.

Last edited by Kurten75; 12th June 2015 at 06:05 AM. Reason: Spelling
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