Amp turns on but hums. I’ve been told it needs new tubes. You can hear the guitar playing through the humming but it’s muffled. Please Look at Photos for Condition!

Vintage Harmony 400A Guitar Amplifier. This is a fully working Harmony 400A, a super cool low-watt tube guitar amp from the 1950s-60s. It runs a single-ended tube circuit with the following tubes. Estimated at 3-5 watts, this amp is not very loud, making it perfect for practice, harmonica, or mic’d recording. It delivers classic, warm lo-fi breakup, especially with single-coil pickups. Original small speaker approx. 6 Original Jensen speaker. Volume & Tone controls. Typical vintage hum/crackle when adjusting knobs. Cosmetic wear consistent with age (see photos). ? Tone: Smooth overdrive at low volume. Perfect for slide guitar, harmonica, and retro blues tone. Think early Chess Records or garage band vibes.