LarryStephen Posted August 20, 2022 Share Posted August 20, 2022 I'm trying to use my Helix LT with an old Fender Dual Showman tube amp. Amplifier is quiet when plugging guitar directly in. When I plug my Helix LT into it there's a low hum. Tried balanced and unbalanced cables as well as lifting the ground. Used multiple guitars. Any thoughts? Thanks, Larry Quote Link to comment Share on other sites More sharing options...
silverhead Posted August 20, 2022 Share Posted August 20, 2022 A few things to investigate: - could be a power issue especially if your LT is connected to your computer via USB. Try disconnecting. - could be your Helix LT output is set to Line level while your amp is expecting an Instrument level input - if you’re using 4CM and a Helix amp model, check the Hum setting Could be something else too; these are just my immediate thoughts. Quote Link to comment Share on other sites More sharing options...
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