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Old 20th January 2011, 03:02 AM   #11
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The tolerance doesn't affect the size of the resistor.

50N06 doesn't mean anything. What's the entire part number?
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Old 20th January 2011, 03:15 AM   #12
Dr Zeus is offline Dr Zeus  United States
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Fairchild FQP50N06
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Old 20th January 2011, 03:42 AM   #13
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Those should be OK with 100 ohm resistors.
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Old 20th January 2011, 04:06 PM   #14
Dr Zeus is offline Dr Zeus  United States
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Another amp fixed!

THis amp needed 12x FQP50N06,12x 100ohm gate resistors, and one 6491 driver.

Also, the Plasma sphere 'transformer' had shorted beyond what I wanted to repair so I simply removed that circuitry from the amp - I mean it was kinda a joke anyway. This amp is being given to a friend so he does not mind one little bit. I have reason to believe that the sphere circutry might have caused the massive blow-out in this amp anyways as it may have shorted the fet driver (See first few posts).

Its not that cool when your amp looks like this powered up. LOL!

Click the image to open in full size.

What surprises me is that this amp uses ST branded TIP35/36 output transistors. Not to bad for a single sided PCB amp made in China. My friend should enjoy it.

Last edited by Dr Zeus; 20th January 2011 at 04:08 PM.
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Old 20th January 2011, 05:13 PM   #15
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If the power supply for the plasma display was the version with only one transistor, it likely had bad solder connections or the transistor was defective. The plasma power supply could not have caused the main power supply to fail.
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Old 21st January 2011, 05:41 PM   #16
jol50 is offline jol50  United States
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I've fixed a few of those and other similar PA amps. Its hard for me to tell if people abused them or that is just the way they are. It seems common for them to use different components in the same/similar boards in various models. I have a little Dual amp with Tip35/36 in it that I put new ones in. One day I tested a sub with it and inadvertently ran it into thermal protection on sine waves while looking at the sub that was rated for more power than the amp. It still works though. Well I guess it is a fully tested amp now as I never had bothered, just makes me wonder how it got blown in the first place if it could take that abuse.

I am really careful of the wires out of the sphere, I broke one easily and had to solder it back together.
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