A glance at any outlet through which Chinese modules can be bought will find this type of tube in small audio amplifier projects ... slightly naff addition of a blue LED beneath each tube socket ...

There’s a mystique in audiophile circles about tube amplifiers. They can have a very nice sound which is attributed to their even-harmonic distortion, but they are often portrayed as requiring ...

Musical Fidelity's revived tube buffer also promises better impedance matching between a source component and an amplifier.