Heat from Legato

bigpandahk · 15th July 2012, 03:10 AM

Recently, I accidentally touched the resistors on legato and got burnt. I measure the temperature and surprising me that its over 75 deg C. Further measure those underneath the BIII, they are over 80 deg C. Is it normal? Such heat may damage or shorten the BIII life.

Russ White · 15th July 2012, 04:18 AM

There are no resistors under the BIII... What do you mean?

Which version of Legato? What voltage at the supplies? You have not given many details for us to give you an answer.

An any case - both circuits were designed to be used at their indicated supply voltages. You should not have any issues if you stick to the numbers.

bigpandahk · 15th July 2012, 04:27 AM

Just bought last month, it's the latest version. Power supply are +-15V.

The BIII is stack above the legato, those resistors are on the legato just underneath the BIII.

Russ White · 15th July 2012, 01:09 PM

If you run it like that you should be just fine, but you can adjust the Legato supply voltage down to 12V rails if it makes you more comfortable.

Those kind of temperatures below the BIII should not be a problem for the BIII in any case, because it will not be getting anything close to that hot.

15th July 2012, 03:10 AM	#1
bigpandahk diyAudio Member Join Date: Jul 2009	Heat from Legato Recently, I accidentally touched the resistors on legato and got burnt. I measure the temperature and surprising me that its over 75 deg C. Further measure those underneath the BIII, they are over 80 deg C. Is it normal? Such heat may damage or shorten the BIII life.

15th July 2012, 04:18 AM	#2
Russ White diyAudio Member Join Date: Jan 2005 Location: Nashville, TN, USA	There are no resistors under the BIII... What do you mean? Which version of Legato? What voltage at the supplies? You have not given many details for us to give you an answer. An any case - both circuits were designed to be used at their indicated supply voltages. You should not have any issues if you stick to the numbers. __________________ Less pulp more juice Twisted Pear Audio.

15th July 2012, 01:09 PM	#4
Russ White diyAudio Member Join Date: Jan 2005 Location: Nashville, TN, USA	If you run it like that you should be just fine, but you can adjust the Legato supply voltage down to 12V rails if it makes you more comfortable. Those kind of temperatures below the BIII should not be a problem for the BIII in any case, because it will not be getting anything close to that hot. __________________ Less pulp more juice Twisted Pear Audio.

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15th July 2012, 04:27 AM	#3
bigpandahk diyAudio Member Join Date: Jul 2009	Just bought last month, it's the latest version. Power supply are +-15V. The BIII is stack above the legato, those resistors are on the legato just underneath the BIII.

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