THD BiValve 30 Head

Marsoni

M251S

$499.50

Get it in 3 business days with 1 day shipping. Friday, May 29

THD BiValve 30 HeadThe BiValve 30 is a Single Ended Class A amplifier head that allows for versatile tonal experimentation by switching between various octal based power tubes, such as 6L6, EL 34, and KT 66, without the need for re biasing. You can mix and match any combination of output and preamp tubes (12AX7, 12AT7, etc.) to achieve different sounds. This amp delivers a range of tones from smooth and clear to aggressive overdrive, with a powerful output transformer

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I bought this as I got a new one month old Roborock 10r. Comparing these with the original, the feeling of the products (the roller brushes, the filter, and the bag) feel the same. These supplies should last six months or so, so the price is good for the value. The tip I will give is when changing the mop, PULL THE EXISTING ONE SLOWLY! There’s cheapish adhesive from the factory and can easily come off the Roborock.

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Reviewed in the United States on May 4, 2025

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Kindle Customer

Whiting, US

★★★★★ 1

Doesn't work with curvx

Size: 26 Pcs for Roborock Saros 10R

Bags dont actually fit the curvx

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Reviewed in the United States on February 7, 2026

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Boise, US

★★★★★ 5

Love the quality and the price.

Size: 26 Pcs for Roborock Saros 10R

Loved that I don’t have to buy the expensive things from Roborock. This works perfectly for my vacuum and very similar quality as the original.

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Reviewed in the United States on May 2, 2025

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Zac

Cuba, US

★★★★★ 5

Eufy 11S Max Replacement Parts Work Well

Size: 20 PACK

For the 11S Max, the parts fit great. Changing out the parts is easy, and the parts are durable. I like that this kit has a new filter for everytime you change out the rotating brushes. Changing out the parts make the eufy vacuum cleaner function better everytime. I can’t tell a difference in the noise level when changing out the parts. Overall, thus is totally worth the money to keep the Eufy running in its best shape.

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Reviewed in the United States on January 24, 2026