[FloridaBoy]

Originally Posted by Loudinny

Ok....so I set the amp up, day 1 I’m in tube heaven. Next day turn the amp on and there’s a nasty buzz from the left channel. Audible from a good 12’ + away. Right channel pretty clean, just a really faint buzz only noticeable when you put your ear right up to the speaker.

Volume has zero impact but pulled the pre amp cables anyway, and the sounds still there, the amp’s definitely the source. Buzz decreases substantially when the bias jack is inserted or the 6sn7 input tube is pulled. Also swapped in another 6sn7 input, still buzzing. Tried a cheater, not a ground loop.

Any suggestions? I’m so frustrated! The amp was new old stock, factory sealed.

Have you cleaned all the tube pins and sockets?