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Kasino K200 Issue [message #27603]

Tue, 03 December 2019 12:24

cejay825
Messages: 5
Registered: December 2019

Junior Member

Picked up a sickly Kasino 200 awhile back. Replaced the 2 large caps....amp had a hiss that wasn't volume depend. started looking into a few things, DC rail volts are around 7.79v and supply is 40v ...on the pre amp board (PC5013)... I was finding so many resistors out of spec that I replaced most all of them with 1% units, replaced all of the electrolytic caps, also Q5, Q6, Q7, Q8, Q9 and Q10 with 2N4401 and 2N4403 units and Q9 an NTE 326 JFET. The hiss is now gone and the amp sounds great BUT I can't get rid of a small DC voltage on the Selectone, Selective Boost,bright switch, treble and bass pots ( no volts on the volume pot).The voltage varies from .3 to .4 volts depending on where you check. The readings seem good except for two points. Q6 collector should be +.1v but reads +.398v and Q10 collector should read -.2v but reads + 1.25v. My guess is C2 on the power board (PC 5024) is preventing this stray DC from reaching amplification ?. Its driving me crazy, any ideas ?

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[Message index]

		Kasino K200 Issue By: cejay825 on Tue, 03 December 2019 12:24
		Re: Kasino K200 Issue By: stevem on Wed, 04 December 2019 06:50
		Re: Kasino K200 Issue By: cejay825 on Wed, 04 December 2019 07:42
		Re: Kasino K200 Issue By: chicagobill on Wed, 04 December 2019 12:58
		Re: Kasino K200 Issue By: cejay825 on Wed, 04 December 2019 13:57
		Re: Kasino K200 Issue By: cejay825 on Thu, 05 December 2019 08:28
		Re: Kasino K200 Issue By: stevem on Thu, 05 December 2019 09:45
		Re: Kasino K200 Issue By: stevem on Thu, 05 December 2019 09:49
		Re: Kasino K200 Issue By: cejay825 on Mon, 09 December 2019 13:52
		Re: Kasino K200 Issue By: stevem on Tue, 10 December 2019 06:13
		Re: Kasino K200 Issue By: Scot²Al²enPer²y on Sat, 10 October 2020 19:33

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