What causes an amp to have major volume changes and crackling even when it isn't being touched? - Quora
![SUCA Audio Mini HiFi Tube-M1 Bluetooth 6K4 Tube Amplifier NE5532 Headset Amplifier U Disk RCA USB Input With Remote Control - AliExpress SUCA Audio Mini HiFi Tube-M1 Bluetooth 6K4 Tube Amplifier NE5532 Headset Amplifier U Disk RCA USB Input With Remote Control - AliExpress](https://ae01.alicdn.com/kf/Ade45fc1b76b44288a750a7c2ce17bc850.jpg_640x640Q90.jpg_.webp)
SUCA Audio Mini HiFi Tube-M1 Bluetooth 6K4 Tube Amplifier NE5532 Headset Amplifier U Disk RCA USB Input With Remote Control - AliExpress
![Tube Amps Explained: How They Work, the Tube Types Available and the Tones They Produce | GuitarPlayer Tube Amps Explained: How They Work, the Tube Types Available and the Tones They Produce | GuitarPlayer](https://cdn.mos.cms.futurecdn.net/MVD4rGYKbazABtRziwJXca.jpg)
Tube Amps Explained: How They Work, the Tube Types Available and the Tones They Produce | GuitarPlayer
![Amazon.com: Nobsound 6P1 6.8W x 2 Vacuum Tube Power Amplifier; Stereo Class A Single-Ended Audio Amp Handcrafted : Electronics Amazon.com: Nobsound 6P1 6.8W x 2 Vacuum Tube Power Amplifier; Stereo Class A Single-Ended Audio Amp Handcrafted : Electronics](https://m.media-amazon.com/images/I/61QopmkLn8L._AC_UF350,350_QL80_.jpg)