300B Transformer temperature

peter7 · 25th September 2008, 05:11 PM

Hello, my 300B SE Transformer is very hot when I burn it about one - two hours, the power transformer temperature will up to 60-70C. is it no problems??

Rod Coleman · 25th September 2008, 08:27 PM

Assume you mean the mains transformer? (Hot output trafo would be bad news).

SE Amplifier can heat their mains trafo, especially:

- not-so-good transformer with 15 to 25W of iron losses;
- capacitor-input filter power supply design.

It's probably OK, but might be wise to find a way of measuring the temperature, so that you can keep watch on it. 70 deg C is probably fine, but much more is a sign of trouble.

Be sure to turn it off when you go out!

SHiFTY · 26th September 2008, 01:26 AM

If you can hold your hand on it for 10 seconds or more it is probably fine.

If you can install a separate filament transformer it might help it.

peter7 · 26th September 2008, 02:49 AM

Yes, the mains transformer hot !! It is improssible hold the hand on it for 10 seconds ,1-2 seconds only!!

Thank you!!

Bas Horneman · 26th September 2008, 10:16 AM

Quote:

1-2 seconds only!!

That is too hot!!!

kevinkr · 26th September 2008, 04:08 PM

Use a small, very quiet fan to cool it.. Your reward will be a power transformer that does not prematurely short its high voltage secondary..

audiowize · 26th September 2008, 04:34 PM

What is the power transformer in question? That is very, very warm.

peter7 · 27th September 2008, 04:12 PM

Thank you every one !!

25th September 2008, 05:11 PM	#1
peter7 diyAudio Member Join Date: Apr 2005 Location: hong kong	300B Transformer temperature Hello, my 300B SE Transformer is very hot when I burn it about one - two hours, the power transformer temperature will up to 60-70C. is it no problems??

26th September 2008, 04:08 PM	#6
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	Use a small, very quiet fan to cool it.. Your reward will be a power transformer that does not prematurely short its high voltage secondary.. __________________ www.kta-hifi.net

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25th September 2008, 08:27 PM	#2
Rod Coleman работник diyAudio Member Join Date: Jul 2004 Location: Warwickshire UK	Assume you mean the mains transformer? (Hot output trafo would be bad news). SE Amplifier can heat their mains trafo, especially: - not-so-good transformer with 15 to 25W of iron losses; - capacitor-input filter power supply design. It's probably OK, but might be wise to find a way of measuring the temperature, so that you can keep watch on it. 70 deg C is probably fine, but much more is a sign of trouble. Be sure to turn it off when you go out!

26th September 2008, 01:26 AM	#3
SHiFTY diyAudio Member Join Date: Jul 2002 Location: New Zealand	If you can hold your hand on it for 10 seconds or more it is probably fine. If you can install a separate filament transformer it might help it.

26th September 2008, 02:49 AM	#4
peter7 diyAudio Member Join Date: Apr 2005 Location: hong kong	Yes, the mains transformer hot !! It is improssible hold the hand on it for 10 seconds ,1-2 seconds only!! Thank you!!

26th September 2008, 04:34 PM	#7
audiowize diyAudio Member Join Date: Aug 2005	What is the power transformer in question? That is very, very warm.

27th September 2008, 04:12 PM	#8
peter7 diyAudio Member Join Date: Apr 2005 Location: hong kong	Thank you every one !!

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