Mastering Massive Passive Retube Kit Version A

Mastering Massive Passive Retube Kit Version A

Marsoni

M251S

$165.00

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

Mastering Massive Passive Retube Kit Version AThis kit is only for Manley MASTERING MASSIVE PASSIVE's with the serial number falling between MMMSMP000 MMMSMP870. Includes (2x) 5814 or 12AU7 tubes for input, and (4x) 6414 or 12BH7 tubes for driver output. Be aware that some tube brands are subject to change over time and may not match the pictures shown.

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Exchange/Return Notes

We offer a 30-day return/exchange service after receiving.
Final sale items are not eligible for returns or exchanges.
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I used this as a junction point on a 1 gauge wire. I added an 8 gauge wire to one side, and the cover would not seat. I had to bend and maneuver the ring terminals to make the cover catch. For the price of the items, if used without any secondary wires attached and interior use only, this is an unbeatable deal.

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Reviewed in the United States on January 30, 2026

Verified Purchase

Joe M. Blair

Birmingham, US

★★★★★ 5

Great Quality

Size: 300A

Exactly what I needed. Good quality and worked perfectly.

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Reviewed in the United States on May 21, 2025

Verified Purchase

Junior

Pawtucket, US

★★★★★ 5

Great

Size: 300A, Size: 300A

Easy to install works great and really good quality and clean looking

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Reviewed in the United States on February 24, 2025

Verified Purchase

Bigzbe

Natrona Heights, US

★★★★★ 5

Nice!

Size: 300A

I was not expecting these to be this nice. You just can't beat the value. They look great and feel like they will hold up a long time. I definitely recommend!

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Reviewed in the United States on July 17, 2024

Verified Purchase

Meeikal

Boise, US

★★★★★ 5

Solid choice for fuse holder

Size: 300A Fuse Holder

It’s awesome, solid connections for running 0 gauge wire. No issues after using for months! Might upgrade to using 0 gauge wire ferrules to use with this but for now everything is working well.

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Reviewed in the United States on January 14, 2026