PPI PCX Series Heatsinks?

Rabbi · 18th February 2011, 08:38 PM

Just picked up a ppi pcx1500 amp from a friend this last week.

I Noticed it has no heatsinks for the mosfets, Ive googled and i see that a couple other people have asked this question before as well.

Did ppi's pcx series come without heatsinks at some point in time? The bottom of the case looks like it possible touchs the mosfets when its in place.

Perry Babin · 18th February 2011, 08:44 PM

I think you mean 'clamps'. I think that this model used clamps (vs having the bottom cover applying pressure to the transistors). Don't power it up without something clamping the transistors to the heatsink.

Rabbi · 18th February 2011, 08:50 PM

The bottom of the case has these tabs on it that look like they possibly apply pressure to the fets.

Perry Babin · 18th February 2011, 09:21 PM

Pull the end plate off and tighten the screws down on the bottom cover. Can you see that the bottom cover is applying pressure to the transistors?

Rabbi · 18th February 2011, 10:29 PM

They do indeed touch the fets, but not the entire fet. Just partially touching it.

Perry Babin · 18th February 2011, 11:36 PM

If it's like the attached photo, it's probably OK.

Rabbi · 19th February 2011, 05:25 AM

yep very similar to that, Thanks Perry!

18th February 2011, 08:38 PM	#1
Rabbi diyAudio Member Join Date: Jan 2011	PPI PCX Series Heatsinks? Just picked up a ppi pcx1500 amp from a friend this last week. I Noticed it has no heatsinks for the mosfets, Ive googled and i see that a couple other people have asked this question before as well. Did ppi's pcx series come without heatsinks at some point in time? The bottom of the case looks like it possible touchs the mosfets when its in place.

18th February 2011, 08:44 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	I think you mean 'clamps'. I think that this model used clamps (vs having the bottom cover applying pressure to the transistors). Don't power it up without something clamping the transistors to the heatsink. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

18th February 2011, 09:21 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Pull the end plate off and tighten the screws down on the bottom cover. Can you see that the bottom cover is applying pressure to the transistors? __________________ 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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18th February 2011, 08:50 PM	#3
Rabbi diyAudio Member Join Date: Jan 2011	The bottom of the case has these tabs on it that look like they possibly apply pressure to the fets.

18th February 2011, 10:29 PM	#5
Rabbi diyAudio Member Join Date: Jan 2011	They do indeed touch the fets, but not the entire fet. Just partially touching it.

19th February 2011, 05:25 AM	#7
Rabbi diyAudio Member Join Date: Jan 2011	yep very similar to that, Thanks Perry!

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