| Tiny noise [message #3503] |
Mon, 12 January 2004 03:22  |
QModer
Messages: 413
Registered: June 2003
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Senior Member |
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I have a lead amp 200 head with a 2x10/2x12 cab. It comes on, pilot light lights but you can just barely hear it even at full volume with the bass and treble full on. It had been working fine until today. Any ideas? Thanks everyone.
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| Re: Tiny noise [message #3513 is a reply to message #3508] |
Wed, 14 January 2004 02:53  |
QModer
Messages: 413
Registered: June 2003
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Senior Member |
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Steve well we had a jam again tonight. So I tried the old Kustom out again before time. It does pop when turned on. But it does hum loud now too. Much louder than any normal one. Its not a pleasant tune either LOL.. Its a sort of growlie type hum. Maybe its just mad at me. But seriously I hope that information does help you some to help me fix it. Do you think its time to peak inside yet?
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| Re: Tiny noise [message #3517 is a reply to message #3516] |
Thu, 15 January 2004 08:45 |
stevem
Messages: 4752
Registered: June 2004
Location: NY
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Senior Member |
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Hi, Yes. if you have volt/ohm meter, and the amp still has its original round four terminal rectifier bridge mounted near the power transformer on the floor of the amp heres what you can do.With the amp unpluged, plull off the 2 wires from the rectifier bridge that do not come from the transformer. They will be on oposite sides of the bridge(hopefully they are original and have not been soldered on)one wire will go to one of the 2 filter caps mounted on the amp floor,and the other will go to the other filter.Infact now that I think about it first trace these wires out off the rectifier to the filter caps and you can just remove them from the top of each cap by the screws. Make a drawing so you are sure which goes back where.At this point you will need a meter with a setting that can check continuity. with a meter set for that it should beep when the leads of the meter are touched together.Now take one lead of the meter and hold it to the frame of the amp touch the other lead and touch it to the frame of the amp somewhere else, the meter should beep.Now take one of those leads off the frame, have the amp standing on end, and touch that lead to the case of each of the output transistors mounted in the slot on the bottom of the amp. If the meter beeps on any one, then that output is for shure bad. At this point if you are not a tech who has done repairs this is about all the help I can give. Even if you find bad outputs their are probibly still bad drivers, open emiter resistors, and other maylays!
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| Re: Tiny noise [message #3518 is a reply to message #3517] |
Thu, 15 January 2004 10:24 |
QModer
Messages: 413
Registered: June 2003
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Senior Member |
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Sounds bad Steve like really its gonna go to a tech no matter what, does'nt it for a few new parts not and just one or two Huh? Do you have a schematic for these things? The reason I ask is its been several years since my local tech person (who's really in the next town over) has worked on this old girl. He did'nt have a schematic then and so probably still does'nt. Also this may be what sounds like a crazy question but it bugs me so here goes. Why would Kustom heads with (200) under the kustom logo on the heads seem louder than other older Kustom 200's with Ross ink under the Kustom logo on the head? I've tested them side by side even into the same cabs. The difference in them seems to occur when you turn the bright deep switch on deep. Other wize the sound and volume appears to the same in the bright position. It seems to act as some sort of volume booster in the (200) labeled heads. I have three Kustom heads with the Ross emblem and three with the (200) emblems on the heads so its not limited to just one set. Also the Kustom with the (200) on them have the channels labeled bright and normal underneath. But I can't tell any sound differences between the channels. Is this some kinda mod that Bud Ross did to later (200) labeled model amps and if so can it be retrograded into the Ross Ink labeled heads?
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| Re: Tiny noise [message #3632 is a reply to message #3503] |
Wed, 04 February 2004 01:41 |
QModer
Messages: 413
Registered: June 2003
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Senior Member |
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Talked to the tech today and told him I got the schematic due to help here. He says he is the authorized tech now for the new Kustom company in this area. How about that.
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| Re: Tiny noise [message #3648 is a reply to message #3646] |
Thu, 05 February 2004 16:20 |
rodak
Messages: 514
Registered: October 2001
Location: Georgia
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Senior Member |
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Can you elaborate a bit on "Fast recovery type" rectifiers? Is that something special, or will just any modern full-wave bridge do the job? (or should I use discrete rectifiers?) Recommended voltage/current ratings for a K200?
www.combo-organ.com
www.combo-organ.com
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