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Old 5th June 2010, 07:20 AM   #11
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No,no power now,but still have a spark when i first apply b+.
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Old 5th June 2010, 07:57 AM   #12
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Join Date: Nov 2003
Location: Louisiana
The spark is normal if only the initial contact creates an intense spark.

What is the DC voltage on the pads for the three legs of that transistor?

Connect only B+ and ground. Place the black meter probe on the amplifier's ground terminal. Place the red meter probe on the point where you need to measure the voltage.
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Old 5th June 2010, 08:10 AM   #13
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12.6-.22-11.4
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Old 5th June 2010, 08:27 AM   #14
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Location: Louisiana
What are the markings on the transistor?
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Old 5th June 2010, 08:34 AM   #15
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Perry it looks like DY 443,its kind of scratched up.
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Old 5th June 2010, 08:47 AM   #16
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Re-check it out of the circuit.

With the black probe on leg 1, what does it read to the other two legs?

With the red probe on leg 1, what does it read to the other two legs?
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Old 5th June 2010, 08:58 AM   #17
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with red probe on what I'm assuming is leg one,to middle leg I get nothing on leg 3 I get 608.With black probe on leg one,to middle I get nothing,to leg 3 I get nothing.This is with DMM on diode.
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Old 5th June 2010, 09:04 AM   #18
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See attached.
Attached Images
File Type: jpg transistormarkedDY01.jpg (37.7 KB, 51 views)
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Old 5th June 2010, 09:28 AM   #19
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ok black probe on 1 I get ~610 to 2 and 3.Red probe on 1,meter shows no change,like Im not touching anything.Thank you for that pic Perry.
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Old 5th June 2010, 10:25 PM   #20
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Set the meter to ohms and make sure the meter reads OL from 2-3. Reverse probes and check again.
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