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Recently I make a 6sn7 lineamp. with triode dick schematic, I found a very loud noise with my scope and this is from the 1st cap. I thought it might be the leak from the cap and I changed it, but the noise still there. Then I change the rectified 5y3 tube and the choke, the noise still there. Could there be problem of the Transformer - Hammond 270EX. Please advise. Thanks
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