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THD BiValve 30 Head

Marsoni M251S
Sale price$499.50
Pay 4 payments of $124.88 a month.Shop Pay
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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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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4.8 ★★★★★
Based on 915 reviews
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Robert E Bryant
Omaha, US
★★★★★ 5
The Best
Color: Black
Ironman watches are the best for everyday and the price is right!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 19, 2026
K
Verified Purchase
Kindle Customer
Carnegie, US
★★★★★ 5
Works as expected
Color: Black
It's a Timex. Says it all...!
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Reviewed in the United States on February 15, 2026
J
Verified Purchase
john w gardner jr
Chelsea, US
★★★★★ 5
Buy!
Color: Black/Negative
Great watch
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Reviewed in the United States on February 22, 2026
L
Verified Purchase
Luna
Boise, US
★★★★★ 4
No instructions
Color: Black/Negative
Watch is good, but it came with no instructions bc this is very confusing to figure out. Backlight is great effect and really nice for the value. Easy to see and read
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Reviewed in the United States on May 29, 2026
N
Verified Purchase
Nethercott
Grantham, US
★★★★★ 5
Functional and great look!
Color: Black, Color: Black
This is my third watch I’ve had in the last 10 years. I bought my first one in 2014 when I was doing triathlons. My second one just died after surfing/working in a hospital with it for the last 3-4 years. I could of just changed the battery but for $40 and it will last, I thought hmmm let’s just get a new one. No complaints! Shipping arrived in 2 days, and the price can’t be beat. If you are looking for a simple watch to wear and not having to worry about getting it messed up this is it! I had a garmin 410xt that I had to charge etc but this watch is extremely convenient and comfortable. High recommend!
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Reviewed in the United States on August 30, 2023

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