| Capacitor Help?? Kustom Kasino [message #7034] |
Tue, 20 June 2006 01:09  |
BrianBartling
Messages: 8
Registered: June 2006
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Junior Member |
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Hi everyone, I am faced with replacing the Caps in a Kustom Kasino 200 solid state guitar amp. The originals are 4500 MFD, at 50 volts. My question is, is it OK or even advisable to go with a higher capacitance and/or voltage rating when replacing these??? I've ordered some computer grade Mallory caps from Mouser.com, which are about 7500mfd, and 75 volts. I really like this amp and do not want to blow it up, so if anyone out there who knows what they're talking about could help me, I'd really appreciate it. Thanks so much !!!
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| Re: Capacitor Help?? Kustom Kasino [message #7035 is a reply to message #7034] |
Tue, 20 June 2006 02:46  |
C4ster
Messages: 686
Registered: June 2001
Location: Mukwonago, WI (Milwaukee...
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Senior Member |
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Hi Brian, and Yes YEs and YES. I routinely replace mine with caps that are 2 to 3 times bigger. The voltage rating is important but as long as they are equal to or higher voltage then you are fine. The computer grade units are the best choice in my opinion. The only drawback in the entire upsizing is the possibility that you will blow the power fuse that is soldered into the amp. It is located above the power switch and can be a bit of paint change. You may not have a soldered in fuse in that model. I am not familiar with anything later than a K200B series. I believe a K200, that is pre Casino has a 3 amp fast blow fuse. I would go no higher than a 5 amp fast blow or a 3 amp slow blow. The capacitors need a bit longer to charge at a higher inrush current so a slow blow might be a better bet. Good luck and go for it. It will substantially improve your headroom before distorting especially for a bass.
Conrad
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| Re: Capacitor Help?? Kustom Kasino [message #7041 is a reply to message #7037] |
Wed, 21 June 2006 00:37 |
C4ster
Messages: 686
Registered: June 2001
Location: Mukwonago, WI (Milwaukee...
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Senior Member |
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Steve, Shure Vocal Master PA heads had a negative temperature coefficient directly heated thermistor in the power transformer input lead mounted on a terminal strip. It exhibited a high resistance value when cold, but heated up quickly to a very low value. I think that is a better idea than the light bulb method. You would need a very large wattage, just guessing, 10 times the wattage value of the amp just to get it out of the circuit when in operation. Another way might be a large resistor, unknown value and a relay with a 24 volt DC coil and a variable resistor in series with the relay. The large resistor would limit the current into the transformer and then when the voltage was high enough, the relay would pull in and short out the resistor. The resistor on the relay would be adjusted for 24 volts at full power supply voltage and it wouldn't drop out until the power were turned off. That might be a whole lot smaller. The power resistor would only have to be a 5 watt or so because it would only be on for a very short period of time. The relay would also be very small. But, and I repeat BUT, you would lose the distinctive Kustom thump when the rig is turned on. A major negative. Perhaps you are overthinking this dilema. Just change the fuse to a slow blow and I think your problem is solved. I have 10,000uF caps in a K100 without any problems. That is 4X the originals. Besides, K200's are only 100 watts not 200 as you well know. I am never sure when to use RMS or peak power in an equation.
Conrad
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| Re: Capacitor Help?? Kustom Kasino [message #7047 is a reply to message #7045] |
Wed, 21 June 2006 10:03 |
C4ster
Messages: 686
Registered: June 2001
Location: Mukwonago, WI (Milwaukee...
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Senior Member |
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I guess it's because I deal in RMS power every day. To me, peak is an old marketing ploy to sound like you are getting more than you really are. Moving a speaker cone is no different than turning a motor. Just think of it as a linear motor. Besides if you use peak to peak power, a Kustom 200 puts out 400 watts. See, it sounds better.
Conrad
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