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ian33 21st January 2012 01:50 PM

DHD AMP -NTX 3107 parts info
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hi all

Am trying to find out the vlaue of a resistor (RP18).It is connected to the first leg of A1220A-y transistor(QP5) and the center leg of c2316 transistor(QP3) This is in the power supply.THis amp came in with capacitor (c2) and resistor RP18 burnt.

Perry Babin 21st January 2012 03:13 PM

If one end connects to the B+ terminal of the amp and the collector of the 1220 connects to pin 11/12 of the 494, it's likely 4.7 ohms.

ian33 21st January 2012 10:48 PM

I put in a 4.7 resistor and i replace the cap.Amp power up and plays good audio.The power supply FET (FQP50n06) have 0.5v on the gate leg,is that normal? Isn't it suposed to be about 4.*v?

Perry Babin 22nd January 2012 12:37 AM

If the supply is regulated, the voltage at the gates may be very low. As long as the rail voltage is correct and the voltage on pins 9/10 and the gates is close, it's likely OK.

ian33 22nd January 2012 11:52 PM

I run it at full power and it is working good

Thanks for the help

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