is a TO3 case better? - Page 2

pinkmouse · 15th March 2008, 08:14 AM

T03s look nicer.

djQUAN · 15th March 2008, 12:26 PM

I have seen gold plated all metal TO-220 devices for military use. forgot where I saw them though. definitely expensive!!

jol50 · 15th March 2008, 08:35 PM

The STK-xxx big ICs seem to work ok, they could make them like that if it was an issue. In reality many new amps have less heatsink anyway...I assume due to more efficient transistors that emit less heat?

TheMG · 15th March 2008, 09:03 PM

The amount of heat dissipated has very little to do with the transistor, it's all about how it is implemented in the circuit and the type of biasing used, as well as the efficiency of the design.

peranders · 15th March 2008, 09:25 PM

I have used 330 W rated TO220 and my opinion here is the if the transistor is going to dissipate much power you must be careful with the mounting technique. How many TO3 are out with 330 W rating? One way to get good mounting is to use springs, not screws.

Workhorse, a blow transistor at 90 deg C, the working conditions wasn't perfect. Maybe mounted in the wrong way.

EWorkshop1708 · 16th March 2008, 03:29 AM

It would be nice if transistors came in more colors. Like different colors for different grades or something. Or just because it looks cool. Capacitors come in many colors, it would be nice if plastic transistors were the same way.

I use to see green every so often, but not anymore. Most are black.

TheMG · 16th March 2008, 05:43 AM

Nothing a little paint can't do!

jacco vermeulen · 16th March 2008, 09:45 AM

You like it dirty, hey ?

(i kinda still fancy chromed steel bumpers)

Workhorse · 16th March 2008, 12:06 PM

Quote:

Originally posted by peranders
Workhorse, a blow transistor at 90 deg C, the working conditions wasn't perfect. Maybe mounted in the wrong way.

Its your assumption only!!!

peranders · 16th March 2008, 12:09 PM

What was the reason then, according to you?

15th March 2008, 08:14 AM	#11
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	T03s look nicer. __________________ Al There is science, logic, reason; there is thought verified by experience. And then there is California. Edward Abbey

15th March 2008, 09:25 PM	#15
peranders Electrons are yellow diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 3	I have used 330 W rated TO220 and my opinion here is the if the transistor is going to dissipate much power you must be careful with the mounting technique. How many TO3 are out with 330 W rating? One way to get good mounting is to use springs, not screws. Workhorse, a blow transistor at 90 deg C, the working conditions wasn't perfect. Maybe mounted in the wrong way. __________________ /Per-Anders (my first name) or P-A as my friends call me BPA300 Group Buy Round 4, SMD-kit and DRV134 pcb. Not too late to sign up. Sign up HERE

16th March 2008, 12:09 PM	#20
peranders Electrons are yellow diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 3	What was the reason then, according to you? __________________ /Per-Anders (my first name) or P-A as my friends call me BPA300 Group Buy Round 4, SMD-kit and DRV134 pcb. Not too late to sign up. Sign up HERE

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15th March 2008, 12:26 PM	#12
djQUAN diyAudio Member Join Date: May 2004 Location: manila	I have seen gold plated all metal TO-220 devices for military use. forgot where I saw them though. definitely expensive!!

15th March 2008, 08:35 PM	#13
jol50 diyAudio Member Join Date: Nov 2007	The STK-xxx big ICs seem to work ok, they could make them like that if it was an issue. In reality many new amps have less heatsink anyway...I assume due to more efficient transistors that emit less heat?

15th March 2008, 09:03 PM	#14
TheMG diyAudio Member Join Date: Jan 2008	The amount of heat dissipated has very little to do with the transistor, it's all about how it is implemented in the circuit and the type of biasing used, as well as the efficiency of the design.

16th March 2008, 03:29 AM	#16
EWorkshop1708 diyAudio Member Join Date: Nov 2004 Location: Florida	It would be nice if transistors came in more colors. Like different colors for different grades or something. Or just because it looks cool. Capacitors come in many colors, it would be nice if plastic transistors were the same way. I use to see green every so often, but not anymore. Most are black.

16th March 2008, 05:43 AM	#17
TheMG diyAudio Member Join Date: Jan 2008	Nothing a little paint can't do!

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