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Old 26th October 2012, 01:04 PM   #1
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Join Date: Jun 2012
Default Rockford Fosgate Punch 60 IX

This amp uses IRFZ40's as the power supply fets Can i switch them to the Z44's?

Also does anyone know the value of the gate resistos ( R31,R32) ?
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Old 26th October 2012, 07:44 PM   #2
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The originals were 100 ohms according to the diagram. I'd go with 47 ohm resistors and 3205s.
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Old 26th October 2012, 08:00 PM   #3
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Location: Washington State
I agree with Perry I would also change Q2, Q3, Q4, Q5 the driver transistors for the power supply.

Sometimes the 1N5336B's will short when the power supply goes they are D4 and D5 you can remove them from the circuit and power up the amp safely only if they are shorted and the amp wont power up.

Also check all the 10uf 16v aluminum caps on the board good chance some are leaky, and check the 2200uf 35v rail caps they can leak also "sometimes".

Good Luck!!!!
Pyramid 52 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch
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