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K200B1 overheating [message #13028]

Wed, 17 February 2010 20:31

real_to_reel
Messages: 11
Registered: September 2007
Location: Los Angeles

Junior Member

Does anyone have schematics for a K200B-1?

Needed are PC703, PC203, PC105

I believe the previous crackling problem is resolved. My current issue: amp is hot enough to bond the naugahyde to the speaker cabinet T&R.

readings:
Output jack 11.6 DCV
Green preamp wire –8.3 DCV
Red preamp wire +8.7 DCV
High voltage DC power supply: -38.9, +39.4

If amp is overheating and not shutting down, is the Thermal circuit breaker (black round plastic, 2 spade connections) failing?

Re. Bias diode - should I add transistor heat compound to it? (there is none on it)

Chassis mounted RCA 36892 transistors – From reading previous posts it appears that these can be easily removed for testing by removing 2 hold-down screws – is this correct?

Thanks for you assistance.

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[Message index]

		K200B1 overheating By: real_to_reel on Wed, 17 February 2010 20:31
		Re: K200B1 overheating By: ellum68 on Wed, 17 February 2010 20:47
		Re: K200B1 overheating By: chicagobill on Thu, 18 February 2010 15:58
		Re: K200B1 overheating By: stevem on Fri, 19 February 2010 05:52
		Re: K200B1 overheating By: real_to_reel on Fri, 19 February 2010 19:09
		Re: K200B1 overheating By: ellum68 on Fri, 19 February 2010 22:51
		Re: K200B1 overheating By: real_to_reel on Mon, 22 February 2010 20:55
		Re: K200B1 overheating By: chicagobill on Tue, 23 February 2010 13:01
		Re: K200B1 overheating By: real_to_reel on Sat, 27 February 2010 16:59
		Re: K200B1 overheating By: stevem on Sat, 27 February 2010 19:09
		Re: K200B1 overheating By: real_to_reel on Sun, 28 February 2010 16:39
		Re: K200B1 overheating By: chicagobill on Mon, 01 March 2010 12:30
		Re: K200B1 overheating By: C4ster on Tue, 02 March 2010 09:58
		Re: K200B1 overheating By: real_to_reel on Wed, 03 March 2010 01:46
		Re: K200B1 overheating By: chicagobill on Wed, 03 March 2010 18:06
		Re: K200B1 overheating By: real_to_reel on Thu, 04 March 2010 22:59
		Re: K200B1 overheating By: stevem on Fri, 05 March 2010 05:41

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