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    Building, troubleshooting and testing of these amplifiers should only be
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Help~ GU50 ?

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Welcome to the club!
Thanks for your reply. I find the topic from Mario2005 http://www.diyaudio.com/forums/tubes-valves/83829-gu50-se-amplifier-class-6sn7-full-construction-details.html

I just have the 6SN7 and GU50 tubes. Is the circuit no problem? Thanks
 
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