My TubelabSE is broken :(

Green77 · 7th June 2011, 07:31 PM

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

simon7000 · 7th June 2011, 07:50 PM

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.

Green77 · 7th June 2011, 08:58 PM

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

simon7000 · 7th June 2011, 09:10 PM

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.

rknize · 8th June 2011, 02:41 AM

What diodes did you use?

Green77 · 8th June 2011, 05:23 AM

I will check the power supply tonight..

I used BY269, works greate (worked maybe

)

Green77 · 8th June 2011, 07:13 PM

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?

simon7000 · 8th June 2011, 08:10 PM

Classic sign of a bad solder joint! Look at the power supply section. If you don't see anything, reheat them all.

Green77 · 9th June 2011, 05:24 AM

Thanks, i will do that in the weekend..

7th June 2011, 07:31 PM	#1
Green77 diyAudio Member Join Date: May 2007 Location: MJOLBY	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

8th June 2011, 02:41 AM	#5
rknize All the best stuff comes from Chian diyAudio Member Join Date: Feb 2009 Location: Chicagoland	What diodes did you use? __________________ Russ http://www.knizefamily.net/russ/cate...ics/tubeaudio/

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7th June 2011, 07:50 PM	#2
simon7000 diyAudio Member Join Date: Nov 2008 Location: Oakmont PA	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.

7th June 2011, 08:58 PM	#3
Green77 diyAudio Member Join Date: May 2007 Location: MJOLBY	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

7th June 2011, 09:10 PM	#4
simon7000 diyAudio Member Join Date: Nov 2008 Location: Oakmont PA	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.

8th June 2011, 05:23 AM	#6
Green77 diyAudio Member Join Date: May 2007 Location: MJOLBY	I will check the power supply tonight.. I used BY269, works greate (worked maybe )

8th June 2011, 07:13 PM	#7
Green77 diyAudio Member Join Date: May 2007 Location: MJOLBY	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?

8th June 2011, 08:10 PM	#8
simon7000 diyAudio Member Join Date: Nov 2008 Location: Oakmont PA	Classic sign of a bad solder joint! Look at the power supply section. If you don't see anything, reheat them all.

9th June 2011, 05:24 AM	#9
Green77 diyAudio Member Join Date: May 2007 Location: MJOLBY	Thanks, i will do that in the weekend..