Marshall avt 150. TDA 7293 issues

B12a3d · 19th May 2011, 11:57 PM

I found this in an old thread but not specific to my problem so I'm posting this again. I replaced the TDA chips twice now. my hypothesis for the first replacements blowing was that I didn't have them attached to the fan housing when I turned it on and they overheated. So I've installed the second set and everything turns on and no blows yet. But I have no sound. Any ideas or help would be awesome I have a show tomorrow and need the amp

audiohead · 20th May 2011, 12:35 AM

Is your pre-amp working?
The LEDs on the front panel working?

Art

B12a3d · 20th May 2011, 01:58 AM

Yes the LEDs are all working, how do I check the pre amp?

amptech · 30th May 2011, 10:06 PM

how to check the preamp....plug a signal in such as a microphone..guitar or cd player and slowly turn it up the pre gain pot on the clean channel then the master level and connect a speaker to the amp, now wait for the sound!

19th May 2011, 11:57 PM	#1
B12a3d diyAudio Member Join Date: May 2011	Marshall avt 150. TDA 7293 issues I found this in an old thread but not specific to my problem so I'm posting this again. I replaced the TDA chips twice now. my hypothesis for the first replacements blowing was that I didn't have them attached to the fan housing when I turned it on and they overheated. So I've installed the second set and everything turns on and no blows yet. But I have no sound. Any ideas or help would be awesome I have a show tomorrow and need the amp

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20th May 2011, 12:35 AM	#2
audiohead diyAudio Member Join Date: Mar 2005 Location: Los Angeles, california	Is your pre-amp working? The LEDs on the front panel working? Art

20th May 2011, 01:58 AM	#3
B12a3d diyAudio Member Join Date: May 2011	Yes the LEDs are all working, how do I check the pre amp?

30th May 2011, 10:06 PM	#4
amptech diyAudio Member Join Date: Jan 2009 Location: Glasgow	how to check the preamp....plug a signal in such as a microphone..guitar or cd player and slowly turn it up the pre gain pot on the clean channel then the master level and connect a speaker to the amp, now wait for the sound!

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