American Bass VFL-500.1

mike49504 · 6th January 2011, 08:18 AM

This amp uses The IRFP064N as power supply fets. I cannot find them anywhere Everyone ive talked to says they have no stock.

Wondering if I could replace them with HUF75344G From future and be fine?

Perry Babin · 6th January 2011, 08:38 AM

The 75344 should be a good sub. Newark has the 064s if you want the originals.

mike49504 · 7th January 2011, 08:23 PM

I replaced the the drivers for the power supply fets in 1 supply .

I have the gate wave form on all power supply fets expect for 3 on each side so i have no gate wave form on 6 total fets in this amp.

Is that normal or do i have a problem somewhere?

Perry Babin · 7th January 2011, 08:32 PM

There's a problem. Check the signal on the bases of the driver transistors for the FETs with no gate signal. Confirm that the NPN driver's collector has 12v on it.

mike49504 · 7th January 2011, 09:12 PM

found the problem Both diodes are shorted. The number is 1N5240B is there a good sub for theese?

Perry Babin · 7th January 2011, 11:07 PM

How were the diodes being used?

It's a 10v Zener diode. You need to use the same part or one with the same breakdown voltage.

6th January 2011, 08:18 AM	#1
mike49504 diyAudio Member Join Date: Sep 2006	American Bass VFL-500.1 This amp uses The IRFP064N as power supply fets. I cannot find them anywhere Everyone ive talked to says they have no stock. Wondering if I could replace them with HUF75344G From future and be fine?

6th January 2011, 08:38 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The 75344 should be a good sub. Newark has the 064s if you want the originals. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

7th January 2011, 08:32 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	There's a problem. Check the signal on the bases of the driver transistors for the FETs with no gate signal. Confirm that the NPN driver's collector has 12v on it. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

7th January 2011, 11:07 PM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	How were the diodes being used? It's a 10v Zener diode. You need to use the same part or one with the same breakdown voltage. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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7th January 2011, 08:23 PM	#3
mike49504 diyAudio Member Join Date: Sep 2006	I replaced the the drivers for the power supply fets in 1 supply . I have the gate wave form on all power supply fets expect for 3 on each side so i have no gate wave form on 6 total fets in this amp. Is that normal or do i have a problem somewhere?

7th January 2011, 09:12 PM	#5
mike49504 diyAudio Member Join Date: Sep 2006	found the problem Both diodes are shorted. The number is 1N5240B is there a good sub for theese?

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