| K 100 UPGRADE QUESTION [message #3076] |
Fri, 19 September 2003 17:17  |
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i have a k 100 bass head that is rated at 50 watts rms. is it possible to upthe wattage on this head to say 100 watts rms by changing some of the electronic components? and if so how would it be done. thanks.
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| Re: K 100 UPGRADE QUESTION [message #3101 is a reply to message #3098] |
Wed, 24 September 2003 11:42  |
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I would recomend not doing anything to your K100. If you need more power buy a bigger amp.
Some things are better left alone...My God ! Did I actually say that??
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| Re: K 100 UPGRADE QUESTION [message #3127 is a reply to message #3110] |
Sat, 27 September 2003 13:49 |
C4ster
Messages: 686
Registered: June 2001
Location: Mukwonago, WI (Milwaukee...
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Senior Member |
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Probibly the easiest way to up the power is to use a slave amp from your K100. I get static every time I say this but, most power amps have an input fader that is directly across the input jack. The output of your k100 is only about 15-20 volts at FULL output before distortion. If you run directly into the slave from the speaker output jack and turn down the K100 to a low level, you will not overload the slave. You just have to be sure you don't overdrive the speakers in the k100 bottom. The Jensens are probibly good for 100 watts total but you could safely drive them to 150-200 and not hurt anything. I routinely run 200 watt JBL's at 400 and they sound great. But remember, that is just one instrument and the speakers get to rest in between notes and the average power is much less.
Conrad
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| Re: K 100 UPGRADE QUESTION [message #3134 is a reply to message #3127] |
Thu, 02 October 2003 09:20 |
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hi guys and gal
i finally got around to fixing the distortion problem onmy k100 bass amp. actually it was pretty easy. all i had to do was solder 2 16 ohm 30 watt resistors . i put one across each speaker to give me a total impedence of 4 ohms. now i can go to 3/4 on volume with very very little distortion. i guess this head likes 4 ohms. i played for about an hour and everything seemed fine. no billowing clouds of smoke.for a 50 watt rms head into a 2x15 cab this baby is pretty loud.not too shabby.
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| Re: K 100 UPGRADE QUESTION [message #3137 is a reply to message #3134] |
Fri, 03 October 2003 09:08 |
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Resistors across the output? I'm afraid there are a couple of problems with that solution.
First, The K100 is marginally stable into 4 ohms. We've had this discussion on this forum before, but the K100's output impedence is too high to work reliably into 4 ohms.
Second, 3/4 on the volume control is basically meaningless in regards to output power (or volume). The volume control position has more to do with the output of your instrument than the overall volume.
Third, even if the amp appears more stable with the resistors, your only producing heat, not sound. I love the Kustoms amps, but I think they suck as space heaters
John Forster
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| Re: K 100 UPGRADE QUESTION [message #3138 is a reply to message #3137] |
Fri, 03 October 2003 10:56 |
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HI JOHN
i didnt see any heat problems with my head .after an hour of playing the resistors were barely warm. they have big heat sinks on them. as far as power i noticed a difference in volume as far as the sound is not as distorted as it was at 8 ohms.actually total impedence is 3.5 ohms acording to my digital meter. i am going to swap out the 2 big electrolytic caps today with 10,000 micro farad 50 volt ones.i like fidling around with components to see the effect it has on the head. no biggie.if you want to talk about an amp as a heat er then try playing an ampeg b 15. you can fry eggs on that one. the kustoms are great amps.im not in a band anymore so this little k100 is fine for what i need it for.
john
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| Re: K 100 UPGRADE QUESTION [message #3139 is a reply to message #3138] |
Fri, 03 October 2003 11:40 |
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My tongue in cheek comment about the space heater wasn't about how hot the resistors will get, but about wasted energy. If you parallel 8 ohms of resistors with 8 ohms of speaker, and the amp is putting out 50 watts, then you have 25 watts of music and 25 watts of heat. Granted you will get some additional power with a lower impedence load, but with a K100 the output is limited by the amp's output impedence. You won't get more that 50 or 60 watts out of the little feller. Resistors across the output will do nothing but waste power.
I can't troubleshoot from afar very well, but I suspect there is something else going on. Have the head looked at with a signal generator and scope to find the real problem.
John Forster
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| Re: K 100 UPGRADE QUESTION [message #3140 is a reply to message #3139] |
Sat, 04 October 2003 00:38 |
C4ster
Messages: 686
Registered: June 2001
Location: Mukwonago, WI (Milwaukee...
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Senior Member |
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As winter is coming and there is a chill in the air, I think the idea of getting a little heat with my music is appealing. I suspect more than one kollector has cuddled up to a warm Kustom. But in all honesty, the amp probibly has a few issues and should be completely checked over. Just replacing components without a reason is playing with fire, maybe literally.
Conrad
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| Re: K 100 UPGRADE QUESTION [message #3142 is a reply to message #3140] |
Tue, 07 October 2003 07:31 |
stevem
Messages: 4748
Registered: June 2004
Location: NY
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Senior Member |
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Hi , just to add my 2 cents. Yes the amp has some issues and should be checked out by a repair tech. Should something in the output give it could put the 40 volt power supply on to your speakers and pop them on you!
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