SKU: 58159504819

Platinum Matched Pair ECC33 Mullard 6SN7 CV2821 100% Brown Base Great Britain

$382.50 $425.00
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Ships within 48 hours · Estimated delivery Jul 29 - Aug 3

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Description

Platinum Matched Pair ECC33 Mullard 6SN7 CV2821 100% Brown Base Great BritainExtremely rare Mullard UK ECC33 CV2821 (6SN7 sub with a bit higher gain), platinum matched pair (2 tubes) Brown base, gray coated, old type square getter with two rods. Used, tested 110% of NOS values. The same date production. 100V on anodes and 0V on grids: (10. 8 10. 9) (10. 9 10. 8) mA 250V on anodes and 6V on grids: (2. 2 2. 3) (2. 4 2. 3) mA Made in famous Blackburn tube plant in 1958, fX1 B8L, the same etched codes. The same codes on base as

Extremely rare Mullard UK ECC33 CV2821 (6SN7 sub with a bit higher gain), platinum matched pair (2 tubes)
Brown base, gray coated, old type square getter with two rods.

Used, tested 110% of NOS values. The same date production. 

100V on anodes and 0V on grids: (10.8/10.9) (10.9/10.8) mA
250V on anodes and -6V on grids: (2.2/2.3) (2.4/2.3) mA

Made in famous Blackburn tube plant in 1958, fX1 B8L, the same etched codes. The same codes on base as well.

Tested for microphonics and noise in RIAA preamp.


Genuine Great Britain product, made in 1958. Hard to find today.



I collect tubes and tube gear for more then 35 years and I start to sell recently, please be sure to check my other items and visit my store for more rare NOS tubes and parts.

If you buy any item on ebay from me and for if you are not fully satisfied for any reason or have any complains, please send me message before leaving negative or neutral feedback or opening a case. I really do care about your satisfaction and I’ll do my best to solve any kind of problem.

I have more than 250000 NOS tubes in stock and just small part is listed here, if you are interested in any specific tube or part, please send me message.


Shipping Notes
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Exchange/Return Notes
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SKU: 58159504819

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4.4 ★★★★★
Based on 8 reviews
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Product Reviews
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Verified Purchase
IT Secure Force
Battle Creek, US
★★★★★ 5
Excellent dog balls — safe design and very durable
Style: Fetch Balls (Pack of 3), Size: 2.5 inch
These fetch balls from Amazon Basics are fantastic, and my dog absolutely loves them. One of the biggest reasons I prefer these over other brands is the hole that runs through the center of the ball. This is a very important safety feature: if a dog were to accidentally get the ball stuck in the back of the throat, the hole allows air to pass through. That small detail could literally make a life-saving difference. Aside from the safety benefit, they bounce well, are easy to clean, and hold up to a lot of playtime. They’re firm but not rock-hard, and my dog goes crazy for them. Great value, great quality, and a thoughtful design. Highly recommended for dog owners who want a safer alternative to standard solid rubber balls.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 1, 2025
M
Verified Purchase
mike
Houston, US
★★★★★ 5
Great ball for heavy chewers
Style: Assorted Balls (Pack of 3), Size: 2.5 inch
Great toy for my Doberman. She chews through tennis balls in about 15 minutes but these are very durable. She likes to chase them but also just chew on them.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 26, 2026
M
Verified Purchase
Me
Dallas, US
★★★★★ 5
Durable
Style: Fetch Balls (Pack of 2), Size: 3 inch
Very bouncy. I like the noise it makes when you throw it. Pretty durable. Good size. Dog loves to play with them. Good material. Easy to use.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 5, 2026
S
Verified Purchase
Susan Cedar
Fort Morgan, US
★★★★★ 4
My dog loves glowing fetch at night!
Style: Glow Balls (Pack of 3), Size: 2.5 inch
Fantastic. Sturdy. My dog loves them Glow in the dark is great for fetch at night. I keep a flashlight with me because the glow doesn't last really long. But they charge very quickly and are really bright.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 22, 2026
M
Verified Purchase
Maddox
Battle Creek, US
★★★★★ 5
Indestructible
Style: Fetch Balls (Pack of 2), Size: 3 inch
These balls are indestructible! We have a lab and a lab mix and they CANNOT damage these balls. They love them for fetch and to just chew on them (slightly squishy, but NO damage). Best toys we have bought for them.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 19, 2026

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