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Re: K200-B1 Replacement output transistors [message #20436 is a reply to message #20431]

Mon, 07 April 2014 06:39

stevem
Messages: 4772
Registered: June 2004
Location: NY

Senior Member

PNP type transistors can not be used in these amps without massivly reworking the driver circuit board on the rear wall of the amp.
Like Bill posted for you the transistors are 2N3055 which are NPN type.
I use NTE130 transistors for these most of the time.
Since the amp has been fitted with the wrong output transistors I would check all 4 of the box type 5 watt emitter resistors and I would also check all 4 of the boxed heatsinked driver transistors.

If you got look at the Technical to the left of the screen here we have the schematics you are asking about.

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[Message index]

		K200-B1 Replacement output transistors By: Eros Segovia on Sun, 06 April 2014 19:28
		Re: K200-B1 Replacement output transistors By: chicagobill on Sun, 06 April 2014 23:24
		Re: K200-B1 Replacement output transistors By: Eros Segovia on Sun, 06 April 2014 23:43
		Re: K200-B1 Replacement output transistors By: stevem on Mon, 07 April 2014 06:39
		Re: K200-B1 Replacement output transistors By: Eros Segovia on Mon, 07 April 2014 15:52
		Re: K200-B1 Replacement output transistors By: Eros Segovia on Mon, 07 April 2014 15:54
		Re: K200-B1 Replacement output transistors By: stevem on Tue, 08 April 2014 06:48
		Re: K200-B1 Replacement output transistors By: Eros Segovia on Sun, 13 April 2014 19:14

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