RT222 TAD 5881-CZ Selected matched tubes pair. The TAD 5881-Cz is a very strong power tube that is characterized by its clear and edgy sound. This is particularly evident in the mids and highs, making the 5881s a popular choice for guitarists looking for a punchy yet defined tone, which is where the tube reveals its unmistakable strength. Due to its characteristic sound signature, the TAD 5881-Cz shows a tight bass range. All in all, the TAD 5881-Cz is a musical and, above all, loud tube that brings a lot of playing energy with it.