| Kustom 400 [message #10744] |
Tue, 14 April 2009 00:36  |
Shaun_Musings
Messages: 323
Registered: April 2009
Location: Reading, MA
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Senior Member |
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Kustomholic (Chris) is buying my blue speaker cabinet. That means money to play with! I'm dropping off his monster cabinet at the airport and I am buying this: http://albany.craigslist.org/msg/1084088632.html
400 series? Not 400 watts, obviously. Can anyone tell me about this head? I'm hoping for support once I open it up and find out what's wrong with it. I asked him if he'd tried it out. He said he switched it on and the light didn't come on. This thing looks awesome and will be channeled into my K-250 with the 2x15 JBLs (Again, thanks Chris for id'ing the thing =))
SD
Born on the Baaaaayou (Ok, in Massachusetts)
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| Re: Kustom 400 [message #10775 is a reply to message #10755] |
Tue, 14 April 2009 23:02  |
C4ster
Messages: 686
Registered: June 2001
Location: Mukwonago, WI (Milwaukee...
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Senior Member |
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Pleat, I noticed you suggest that speakers be attached to the output of each amp. That was completely true for tube amps where an unloaded amp would create a very high voltage output. Fender amps had their output jacks set up so if there was nothing plugged into the jack, the jacks shorted the output. If you plugged in a cord and did not connect a speaker, you could fry the output tubes or the transformer itself. A solid state amp is much more forgiving. The output voltage will never rise more than the power supply voltage and cannot damage the transistors. The first checks I do on any SS amp is to power up without speakers and read the voltage. If its sitting at about 0 volts then I plug in the speakers. It's much worse for the speakers and the transistors if there is a problem that needs to be fixed.
Conrad
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| Re: Kustom 400 [message #10781 is a reply to message #10775] |
Tue, 14 April 2009 23:55 |
Shaun_Musings
Messages: 323
Registered: April 2009
Location: Reading, MA
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Senior Member |
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These are solid states, correct? I agree, it would be nice if it were something simple, like a blown fuse (I can take care of that in a few minutes). Does Kustom have that 'fail-safe' that allows me to simply plug in one speaker? I can't honestly see why I would ever have it on without a speaker plugged in anyway.
There really should be a 'Kustoms for Dummies' book... amps are relatively new to me in terms of playing. Before, I just jammed my plugs into a jack, and that was that. The big Marshalls I had worked fine, no need to tinker around. These, partly because of their age, appear to be high maintenence speakers... =)
<Pleat, I noticed you suggest that speakers be attached to the output of each amp. That was completely true for tube amps where an unloaded amp would create a very high voltage output. Fender amps had their output jacks set up so if there was nothing plugged into the jack, the jacks shorted the output. If you plugged in a cord and did not connect a speaker, you could fry the output tubes or the transformer itself. A solid state amp is much more forgiving. The output voltage will never rise more than the power supply voltage and cannot damage the transistors. The first checks I do on any SS amp is to power up without speakers and read the voltage. If its sitting at about 0 volts then I plug in the speakers. It's much worse for the speakers and the transistors if there is a problem that needs to be fixed.
>
Shaun
Born on the Baaaaayou (Ok, in Massachusetts)
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| Re: Kustom 400 [message #10803 is a reply to message #10794] |
Wed, 15 April 2009 21:59 |
C4ster
Messages: 686
Registered: June 2001
Location: Mukwonago, WI (Milwaukee...
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Senior Member |
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I agree that Kustoms for the most part are bullet proof. 4 ohms is the minimum for K200/K400 amps. But that is because they become unstable at lower impedance. But higher is OK with a reduction in power output. I was only pointing out that no speaker is not hazardous to it's health. Obviously you want a speaker attached. How else would you hear what you're playing. I have had Kustom's since 1969, my first PA. I have a nice collection right now including a 2x15 cascade bottom from you pleat. Either you or Don Thompson. I'm still looking for that elusive K100 in red. Dream on!!!
Conrad
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| Re: Kustom 400 [message #10817 is a reply to message #10813] |
Thu, 16 April 2009 21:05 |
C4ster
Messages: 686
Registered: June 2001
Location: Mukwonago, WI (Milwaukee...
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Senior Member |
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Somewhere back in time, I think I have already accused you of the sale! As I get older, the brain cells take a vacation. I just wish I had a backup email or something so I can STOP this rehashing if meaningless drivel. I still am looking for that red K100 2x12.
Conrad
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