TU-875

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i had this wonderful preamp for a short time, someone who built it from a kit gave it to me. One channel has gone so i looked inside and touched up a few possible cold solder joints, after the channel came back for a day then again one channel is out. any idea what i could check before sending it to a tech? thank you

i cant wait to get this running again. I had this paired with a Nakamichi PA 5 and it sounded the best I have ever heard from my system.
 
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