Why does it say matched? Does this mean if one burns out you have to replace all four?

Matched means the four tubes are matched. If one burns out and you replace it you may need to adjust bias on tube. You use matched tubes so you do not need To adjust your amp when you replace tubes. Typically when one goes, the rest are soon to follow. So it is best to replace all 4

Would these tubes do well with a marshall dsl 40 cr?

These would be great for any amp that calls for EL34 tubes. Tube tone is subjective, so these may not work for everyone, but they are considered by many one of the most consistent and reliable tubes on the market.

Can you use these jj electronics t-el34-jj-mp vacuum tubes for a bugera g20 infinium?

The manual for the Bugera g20 infinium specifies a pair of EL34 tubes for the power section. So yes, these tubes can be used.

Turned my Blackstar amp on, and saw one tube glowing red, while the other is completely cold. Does that indicate a bad tube needing replacement?

That is usually the case..If it is the same type tube as the glowing one ..replace the cold tube in the socket with the good tube. That may help you figure out the problem..

JJ ElectronicAmplifier Tube (T-EL34-JJ)

Product ID: 263314277

📏11.68 cm

🔊25W Power

⚖️59 g

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VT19724

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Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎶 Elevate Your Audio Game with JJ Electronics!

COMPACT DESIGN - Perfectly sized at 11.68 x 4.06 x 4.06 cm for easy integration.
RELIABLE QUALITY - Designed for durability and consistent performance in your audio system.
VERSATILE OPTIONS - Available in Singles, Apex Matched Pairs, or Quads to suit your setup.
UNLEASH YOUR SOUND - Experience rich, warm tones with the JJ Electronics Amplifier Tube.
LIGHTWEIGHT PERFORMANCE - Weighing only 59 g, it’s easy to handle and install.

The JJ Electronics Amplifier Tube (T-EL34-JJ) is a high-performance octal power tube, delivering a maximum plate wattage of 25W. It is available in various configurations, including singles, apex matched pairs, and quads, making it a versatile choice for audiophiles. With a compact design and lightweight build, this tube is engineered for optimal sound quality and reliability.

Specifications

Item Weight	59 g
Product Dimensions	11.68 x 4.06 x 4.06 cm; 58.97 g
Item model number	T-EL34-JJ
Color Name	Single

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