Marshall JVM 210H Dead Silent | Not the Output Transformer!

This Marshall JVM 210H came in completely dead silent — no output at all. The customer had already swapped the output transformer, thinking that was the issue. In this video, I walk through the full troubleshooting process: • Verifying the transformer and installation • Tube testing and replacement • Resistance and voltage checks • Finding a blown HT fuse • Discovering failed power tubes and a bad speaker output jack • Biasing the new tubes and restoring the amp If you like in-depth amp repair content, subscribe for more:    / @technologyenterprises   Support the channel & get bonus materials on Patreon:   / technologyenterprises   00:00 Intro 00:47 Back of the Amp 01:26 Tube Test Results 02:32 Resistance Checks - Inside the Chassis 07:01 Fuse Talk 08:22 Initial Power Up 11:05 Checking Voltages - Current Limiter 13:26 Full Power 22:04 Problem Solved! #tubeamplifier #amprepair #guitaramp #guitaramplifier