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cilla.scope
Old Croc
Legs all the way to her bottom....
Joined: 02 October 2009
Status: Offline
Points: 2954
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Posted: 16 June 2010 at 12:05am |
That, dear sir ... is capacitor poop.
I would hazard a guess that the lack of support on the caps allowed that one to work loose from its solder joint, got hot and fried, releasing the dielectric fluid.
Decent amps make sure their capacitors are securely fixed .. best is to arrange them to be about the same height as the case and to use a bit of foam on the lid, or a non-setting rubber based adhesive like evo-stick or a tape binding around a block of them them. Breakaway caps ae a common failure point on cheaper amps, just shows a general lack of attention to detail.
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My girlfriend thinks I'm a stalker. Well, she's not exactly my girlfriend yet ...
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The Builder
Old Croc
Joined: 03 January 2010
Status: Offline
Points: 3107
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Posted: 16 June 2010 at 12:45am |
cilla.scope wrote:
That, dear sir ... is capacitor poop.
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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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Posted: 17 June 2010 at 8:46pm |
They are actually glued down and normally difficult to remove!
This is the result of the stock fault of the bridge rectifier sparking. The capacitor does not like it up it.
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Kevin
North Staffordshire
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The Builder
Old Croc
Joined: 03 January 2010
Status: Offline
Points: 3107
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Posted: 17 June 2010 at 8:48pm |
As I have three of these, is there preventative action?
Thanks
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It just is.
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cilla.scope
Old Croc
Legs all the way to her bottom....
Joined: 02 October 2009
Status: Offline
Points: 2954
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Posted: 17 June 2010 at 11:01pm |
The Builder wrote:
As I have three of these, is there preventative action?
Thanks |
yes, eBay :)
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My girlfriend thinks I'm a stalker. Well, she's not exactly my girlfriend yet ...
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soundguymatt
Young Croc
Joined: 25 August 2009
Status: Offline
Points: 688
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Posted: 17 June 2010 at 11:02pm |
The Builder wrote:
As I have three of these, is there preventative action?
Thanks |
i've seen a few amps where they glue them together in a hex shape and some where there's foam in between them (like underlay foam), dunno much about amps tho.
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Centauri
Old Croc
Joined: 29 November 2004
Location: Newcastle Aus
Status: Offline
Points: 1792
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Posted: 21 June 2010 at 2:19pm |
Crown XTi4000. For accessibility / serviceability probably one of the worst amps I have had to work on.... Closeup of heatsinks showing output transistors hidden within heatsink halves pressed together - surface mount components can also be seen underneath the heatsink... Closeup of the switching tracking supply section. The drive circuitry for the switching mosfets on the two heatsinks is between and below the heatsinks directly in front of the fan - completely inaccessible for fault finding...
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Centauri
Old Croc
Joined: 29 November 2004
Location: Newcastle Aus
Status: Offline
Points: 1792
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Posted: 21 June 2010 at 2:39pm |
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Centauri
Old Croc
Joined: 29 November 2004
Location: Newcastle Aus
Status: Offline
Points: 1792
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Posted: 21 June 2010 at 2:54pm |
An older one this time - Carver PT-1250, also known as a PM 2.0t The underside of the power supply module - lots of fun to replace the TO3 switching transistors when they fail ........
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kedwardsleisure
Old Croc
Joined: 20 January 2009
Location: Staffordshire
Status: Offline
Points: 4938
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Posted: 22 June 2010 at 6:59pm |
The XTi are truly a design worthy of Harman's reputation
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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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Posted: 24 June 2010 at 5:14am |
MunkeyQ wrote:
Here's a photo inside a Crown XLS202. If anyone's looking for an amp with plenty of space to stash your mid-gig snacks inside, this is the one...
200wpc at 8 ohms...supposedly. Four output devices per channel, small heatsinks, 13,200uF of filter capacitance and a transformer not much bigger than the bagel I had for lunch.
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Good God ! ..thats a design mess :o ..bloody bizarre one at that.
Edited by nineleaves - 24 June 2010 at 5:21am
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soundguymatt
Young Croc
Joined: 25 August 2009
Status: Offline
Points: 688
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Posted: 24 June 2010 at 8:42am |
nineleaves wrote:
MunkeyQ wrote:
Here's a photo inside a Crown XLS202. If anyone's looking for an amp with plenty of space to stash your mid-gig snacks inside, this is the one...
200wpc at 8 ohms...supposedly. Four output devices per channel, small heatsinks, 13,200uF of filter capacitance and a transformer not much bigger than the bagel I had for lunch.
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Good God ! ..thats a design mess :o ..bloody bizarre one at that.
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you could quite easily up the transformer, and with better layout make it a 6 channel amp. (assuming you keep the same output power)
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