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Old 7th June 2011, 07:31 PM   #1
Green77 is offline Green77  Sweden
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Default My TubelabSE is broken :(

Hi all!

I have about 15 hours of music pleasure with my TSE. I used it last week and everything was fine. Today when i started it it was a soft hum when it was heating up (normal for 15 sec on my TSE). But this time the hum didn't disappeare..and when i turn the volumpot up the sound was weak and much dist and the hum increased..

I haven't meassured anything yet and can't see anything wrong..

Is it safe to try again and messuare on it? Anyone with an idea?

Thanks //Daniel
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Old 7th June 2011, 07:50 PM   #2
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If both channels are the same it most likely is the power supply. So first try changing the 5AR4 rectifier tube. Then try measuring the voltages out of the power supply section.
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Old 7th June 2011, 08:58 PM   #3
Green77 is offline Green77  Sweden
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Well, i did some changes to the power supply (change the 5AR4 to SS) because i had a PT that didn't had enough output for a tube..
But i will start to measuring the power out..
Thanks
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Old 7th June 2011, 09:10 PM   #4
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If a power supply voltage is low you can unplug the tubes. If it rises to normal then the problem is in the amplifier. If it doesn't then it is in the power supply. It is easy to check the diodes with an ohm meter out of circuit. Most likely power supply problem is a shorted capacitor.
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Old 8th June 2011, 02:41 AM   #5
rknize is offline rknize  United States
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What diodes did you use?
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Old 8th June 2011, 05:23 AM   #6
Green77 is offline Green77  Sweden
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I will check the power supply tonight..

I used BY269, works greate (worked maybe )
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Old 8th June 2011, 07:13 PM   #7
Green77 is offline Green77  Sweden
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And now it's working..
I moved the amp today to do some measuring..all voltage was ok..i plugged in the speakers and put music on.. tada, it worked perfect.. i didn't do anything..
THAT EVEN SCARE ME MORE Maybe some bad joint?
It was a very heavy thunderstorm about an hour after i tried to play with it..maybe spikes on the primary?
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Old 8th June 2011, 08:10 PM   #8
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Classic sign of a bad solder joint! Look at the power supply section. If you don't see anything, reheat them all.
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Old 9th June 2011, 05:24 AM   #9
Green77 is offline Green77  Sweden
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Thanks, i will do that in the weekend..
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