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Old 25th September 2008, 05:11 PM   #1
peter7 is offline peter7  Hong Kong
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Default 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??
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Old 25th September 2008, 08:27 PM   #2
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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!
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Old 26th September 2008, 01:26 AM   #3
SHiFTY is offline SHiFTY  New Zealand
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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.

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Old 26th September 2008, 02:49 AM   #4
peter7 is offline peter7  Hong Kong
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Yes, the mains transformer hot !! It is improssible hold the hand on it for 10 seconds ,1-2 seconds only!!

Thank you!!
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Old 26th September 2008, 10:16 AM   #5
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1-2 seconds only!!
That is too hot!!!
If you can see the speaker cone move...it's not hifi.
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Old 26th September 2008, 04:08 PM   #6
kevinkr is offline kevinkr  United States
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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..
"To argue with a person who has renounced the use of reason is like administering medicine to the dead." - Thomas Paine
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Old 26th September 2008, 04:34 PM   #7
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What is the power transformer in question? That is very, very warm.
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Old 27th September 2008, 04:12 PM   #8
peter7 is offline peter7  Hong Kong
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Thank you every one !!
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