charger bass amp [message #14750] |
Sun, 28 November 2010 17:35 ![Go to next message Go to next message](/FUDforum/theme/vk30/images/down.png) |
rptrsn2
Messages: 28 Registered: September 2010 Location: canton mo
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Junior Member |
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looking for a some help wth a squeal from this amp. if you turn the treble or volume up much it gets a real loud squeal, is there something common with these i should look for? thanks
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Re: charger bass amp [message #14770 is a reply to message #14750] |
Tue, 30 November 2010 07:02 ![Go to previous message Go to previous message](/FUDforum/theme/vk30/images/up.png) ![Go to next message Go to next message](/FUDforum/theme/vk30/images/down.png) |
stevem
Messages: 4772 Registered: June 2004 Location: NY
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Senior Member |
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I never heard of that Kustom revision meno, thanks for passing that along Pleat!
I would then also assume that the tad cheaper 1N4005 diode with just a 600 volt rating instead of a 1K rating would be a fine retro fit also.
[Updated on: Tue, 30 November 2010 07:05] Report message to a moderator
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Re: charger bass amp [message #14778 is a reply to message #14750] |
Tue, 30 November 2010 14:36 ![Go to previous message Go to previous message](/FUDforum/theme/vk30/images/up.png) ![Go to next message Go to next message](/FUDforum/theme/vk30/images/down.png) |
stevem
Messages: 4772 Registered: June 2004 Location: NY
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Senior Member |
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No. there is no bad side effects of replacing the power switch with a new one if its done properly.
The ground lift switch on newer amps does just that, the polarity switch on these and other old amps with only a two conductor power cord switches the amps ground reference from one side of the A/C line to the other.
[Updated on: Tue, 30 November 2010 14:36] Report message to a moderator
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Re: charger bass amp [message #14799 is a reply to message #14750] |
Thu, 02 December 2010 07:16 ![Go to previous message Go to previous message](/FUDforum/theme/vk30/images/up.png) |
stevem
Messages: 4772 Registered: June 2004 Location: NY
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Senior Member |
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Sorry I lost track of the questions.
Yes you can replace that switch with a on/off switch since you have a grounded cord now.
Use a doubble pole single throw type switch(DPSH for short)rated for atlest 3 amps at 120 volts.
Wire it in so it opens and closes both the white and black wires coming in from the power cord.
On the metal face amps the record output jack taps signal off of the speaker out thru a 10 or 15k resistor if I remember right, and this was the same with the RCA jacks on the 200 and 400 models.
The monitor out jack or power amp out jack took the in coming signal to the driver from the preamp board.
One other thing you might try to trouble shoot the amps problem is to pick up a can of freeze spray from Radio Shack.
With this and a hair dryer you can heat up and rapidly cool down sections of the circuit board and see if the temperature swing effects the sqeals volume and or frequency and in this way pin down a bad soilder joint or component.
Do not go overboard with the heat 120 degrees is about tops in regards to transistors and the 14 pin IC chip, caps and resistors can take a bit more but its hard to keep the heat that concentrated from other componets.
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