Upgrade for TIP35/36 outputs

EWorkshop1708 · 9th August 2011, 11:22 PM

I have an amp that uses 125w Tip35/36 outputs and it gets quite warm.

What could I replace them with that handle more power?

What about Mjw21195/96 200w?

Reason I ask is because Tip is 25A part.

nigelwright7557 · 10th August 2011, 12:00 AM

What ever you replace them with will get just as warm with the same heatsink.

I would go for a bigger heatsink and/or a fan.

EWorkshop1708 · 10th August 2011, 12:44 AM

I can't change the layout, I want better transistors so it will have better SOA when hot.

nigelwright7557 · 10th August 2011, 12:48 AM

Quote:

Originally Posted by EWorkshop1708

I can't change the layout, I want better transistors so it will have better SOA when hot.

Most silicon works up to 150 degrees C with some exceptions.

Can you not fit a small DC fan ?

EWorkshop1708 · 10th August 2011, 01:02 AM

The amp has 3 pairs of outputs for each "channel" 6 pairs total.
It has a fan already. It's a 400w/800w @ 4/2 ohm btl mono amp.
It got warm with only 4 ohm, didn't try 2 yet.

I think its a lot of power to ask from those outputs, so I'm wondering what's better.

jaycee · 10th August 2011, 01:31 AM

If you're really set on changing transistors then yes MJW21193/4 would be a good choice. However getting rid of the heat is the problem..

9th August 2011, 11:22 PM	#1
EWorkshop1708 diyAudio Member Join Date: Nov 2004 Location: Florida	Upgrade for TIP35/36 outputs I have an amp that uses 125w Tip35/36 outputs and it gets quite warm. What could I replace them with that handle more power? What about Mjw21195/96 200w? Reason I ask is because Tip is 25A part. __________________ You can call me Mad Professor, building crazy experiments in my Electronics Workshop

10th August 2011, 12:00 AM	#2
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	What ever you replace them with will get just as warm with the same heatsink. I would go for a bigger heatsink and/or a fan. __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

10th August 2011, 12:44 AM	#3
EWorkshop1708 diyAudio Member Join Date: Nov 2004 Location: Florida	I can't change the layout, I want better transistors so it will have better SOA when hot. __________________ You can call me Mad Professor, building crazy experiments in my Electronics Workshop

10th August 2011, 01:02 AM	#5
EWorkshop1708 diyAudio Member Join Date: Nov 2004 Location: Florida	The amp has 3 pairs of outputs for each "channel" 6 pairs total. It has a fan already. It's a 400w/800w @ 4/2 ohm btl mono amp. It got warm with only 4 ohm, didn't try 2 yet. I think its a lot of power to ask from those outputs, so I'm wondering what's better. __________________ You can call me Mad Professor, building crazy experiments in my Electronics Workshop

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10th August 2011, 01:31 AM	#6
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	If you're really set on changing transistors then yes MJW21193/4 would be a good choice. However getting rid of the heat is the problem..

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