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K250-1 Popping [message #9916]

Sun, 16 November 2008 23:11

ellum68
Messages: 71
Registered: November 2007
Location: Sioux City, IA

Member

This is a "from the dead" project. I got a basket case K250-1 that was supposed to be for parts. As usual, I started to put the thing back together. I got it to fire up and the upper channel works great. The lower channel has issues. I had to wire a new set of jacks (copied how the upper channel was done). If I turn the volume control up, I will get almost a radio like static, and then it will start a steady popping, almost motorboating kind of noise. I can't remember if I have the bright control out or in, but that will kill the popping noise. I'm still left with faint output and lots of hiss. The only thing done to this channel was repairing a gummed up treble pot. I've pulled and tested every capacitor on the preamp board.

The power switches have been worked over a bit. I used a push button LED setup from Mouser. I have the polarity switch installed and it's LED wired up (2k resistor on the power LED to cut the voltage down). I have the other switch for the power button on backorder. So, I have things hardwired and the power lead to that side has just been taped off.

[Updated on: Sun, 16 November 2008 23:15]

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[Message index]

		K250-1 Popping By: ellum68 on Sun, 16 November 2008 23:11
		Re: K250-1 Popping By: stevem on Mon, 17 November 2008 06:30
		Re: K250-1 Popping By: ellum68 on Mon, 17 November 2008 14:44
		Re: K250-1 Popping By: chicagobill on Mon, 17 November 2008 16:51
		Re: K250-1 Popping By: ellum68 on Mon, 17 November 2008 18:24
		Re: K250-1 Popping By: ellum68 on Mon, 17 November 2008 19:34
		Re: K250-1 Popping By: stevem on Tue, 18 November 2008 06:32
		Re: K250-1 Popping By: chicagobill on Tue, 18 November 2008 12:04
		Re: K250-1 Popping By: ellum68 on Tue, 18 November 2008 23:35
		Re: K250-1 Popping By: stevem on Wed, 19 November 2008 06:58
		Re: K250-1 Popping By: ellum68 on Wed, 19 November 2008 23:33
		Re: K250-1 Popping By: stevem on Thu, 20 November 2008 07:09
		Re: K250-1 Popping By: chicagobill on Thu, 20 November 2008 11:52
		Re: K250-1 Popping By: stevem on Thu, 20 November 2008 12:19
		Re: K250-1 Popping By: ellum68 on Thu, 20 November 2008 20:02
		Re: K250-1 Popping By: stevem on Fri, 21 November 2008 05:57
		Re: K250-1 Popping By: chicagobill on Fri, 21 November 2008 13:39
		Re: K250-1 Popping By: ellum68 on Fri, 21 November 2008 14:56
		Re: K250-1 Popping By: chicagobill on Fri, 21 November 2008 15:28
		Re: K250-1 Popping By: ellum68 on Fri, 21 November 2008 15:41
		Re: K250-1 Popping By: chicagobill on Fri, 21 November 2008 18:07
		Re: K250-1 Popping By: ellum68 on Fri, 28 November 2008 22:04
		Re: K250-1 Popping By: Crazy Joe on Sat, 29 November 2008 11:41
		Re: K250-1 Popping By: Crazy Joe on Sat, 29 November 2008 12:54
		Re: K250-1 Popping By: stevem on Mon, 01 December 2008 06:18

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