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NAMM Show Report

Should Guitar Amp Tubes Glow Blue?

Q: The tubes in my guitar amp are glowing blue instead of sort of a yellow glow. Are the tubes bad? A: That blue glow is just a side effect of a power tube — a fluorescent glow in the blue spectrum. The tube... Read more »

Guild M-240E Troubadour Acoustic-electric Guitar at Winter NAMM 2017

Sweetwater stops by the Guild booth at Winter NAMM 2017 to check out the M-240E Troubador guitar. After the video, see Sweetwater's complete coverage of the Winter NAMM 2017 trade show here:... Read more »

DW Collector’s Exotic Stradavarius 45th Anniversary Shell Pack at Winter NAMM 2017

Sweetwater stops by the DW booth at Winter NAMM 2017 to check out the Collector's Exotic Stradavarius 45th Anniversary shell pack. After the video, see Sweetwater's complete coverage of the Winter NAMM 2017 trade... Read more »

Guild T-Bird ST Electric Guitars at Winter NAMM 2017

Sweetwater stops by the Guild booth at Winter NAMM 2017 to check out the T-Bird ST electric guitar.. After the video, see Sweetwater's complete coverage of the Winter NAMM 2017 trade show here:... Read more »

Cordoba 25 Series Ukuleles at Winter NAMM 2017

Sweetwater stops by the Cordoba booth at Winter NAMM 2017 to check out their 25 series ukuleles. After the video, see Sweetwater's complete coverage of the Winter NAMM 2017 trade show here:... Read more »

Line 6 Spider V 240HC Head/Combo Amplifier at Winter NAMM 2017

Mitch Gallagher stops by the Line 6 booth at Winter NAMM 2017 to check out the Spider V 240HC head/combo amplifier. After the video, see Sweetwater's complete coverage of the Winter NAMM 2017 trade show here:... Read more »

Fender Acoustic Guitar Combo Amplifiers at Winter NAMM 2017

Mitch Gallagher stops by the Fender booth at Winter NAMM 2017 to check out the latest acoustic guitar combo amplifiers. After the video, see Sweetwater's complete coverage of the Winter NAMM 2017 trade show here:... Read more »

Fender Custom Shop Founder’s Design Project at Winter NAMM 2017

Mitch Gallagher stops by the Fender Custom Shop booth at Winter NAMM 2017 to check out the Founder's Design Project guitars. After the video, see Sweetwater's complete coverage of the Winter NAMM 2017 trade show... Read more »

Slate Digital VRS-8 Audio Interface at Winter NAMM 2017

Sweetwater stops by the Slate Digital booth at Winter NAMM 2017 to check out the VRS-8 audio interface and the ML-2 modeling microphone. After the video, see Sweetwater's complete coverage of the Winter NAMM 2017... Read more »

Slate Raven MTi Core Station at Winter NAMM 2017

Sweetwater stops by the Slate Digital booth at Winter NAMM 2017 to check out the Raven MTi Core Station. After the video, see Sweetwater's complete coverage of the Winter NAMM 2017 trade show here:... Read more »

Roland RD-2000 Digital Piano at Winter NAMM 2017

Mitch Gallagher stops by the Roland booth at Winter NAMM 2017 to check out the RD-2000 stage piano. After the video, see Sweetwater's complete coverage of the Winter NAMM 2017 trade show here:... Read more »

Lynx Aurora (n) at Winter NAMM 2017

Mitch Gallagher stops by the Lynx booth at Winter NAMM 2017 to check out the Aurora (n) AD/DA converter. After the video, see Sweetwater's complete coverage of the Winter NAMM 2017 trade show here:... Read more »

Roland Go:Mixer at Winter NAMM 2017

Mitch Gallagher stops by the Roland booth at Winter NAMM 2017 to check out the GO:MIXER. Kelly is also using the Boss RC-202 Loop Station to make her loops. After the video, see Sweetwater's complete coverage of the... Read more »

Steinberg Cubase 9 at Winter NAMM 2017

Mitch Gallagher stops by the Steinberg booth at Winter NAMM 2017 to check out Cubase 9 DAW software. After the video, see Sweetwater's complete coverage of the Winter NAMM 2017 trade show here:... Read more »

LsL Instruments Presents Carl Verheyen – Winter NAMM 2017

Sweetwater stops by the LsL Instruments booth at Winter NAMM 2017 to hear Carl Verheyen put his signature guitar through its paces. After the video, see Sweetwater's complete coverage of the Winter NAMM 2017 trade... Read more »

Winter NAMM 2017 Recap – Days Two and Three

Sweetwater wraps up Days 2 and 3 at Winter NAMM 2017! See our complete coverage of the Winter NAMM 2017 Trade Show in Anaheim, CA here: https://www.sweetwater.com/insync/show/winter-namm-2017/

Taylor Guitars Academy Series, GS Mini Bass, and 800 Deluxe Series at Winter NAMM 2017

Taylor Guitars unveils their new Academy Series, GS Mini Bass, and 800 Deluxe Series at Winter NAMM 2017 For more NAMM coverage, click here: https://www.sweetwater.com/insync/show/winter-namm-2017/

BOSS & Strandberg Boden V-Guitar Prototype at Winter NAMM 2017

For more Winter NAMM 2017 coverage, click here: https://www.sweetwater.com/insync/show/winter-namm-2017/

BOSS Acoustic Singer Pro at Winter NAMM 2017

The BOSS Acoustic Singer Pro has the power, depth, and features to transform your set into an engaging audience experience. Its 120 watts and custom two-speaker cabinet reproduce the fullness of your voice and... Read more »

Seymour Duncan Effects Pedals at Winter NAMM 2017

Mitch Gallagher stops by the Seymour Duncan booth at Winter NAMM 2017 to check out the Andromeda Delay pedal, as well as the PowerStage power amp. After the video, see Sweetwater's complete coverage of the Winter... Read more »

PRS John Mayer Press Conference at Winter NAMM 2017

Mitch Gallagher stops by the PRS booth at Winter NAMM 2017 to hear with John Mayer and Paul Reed Smith discuss the new J-MOD 100 John Mayer Signature 100-watt amplifier. After the video, see Sweetwater's complete... Read more »

Aston Microphones Starlight at Winter NAMM 2017

Sweetwater stops by the Aston Microphones booth at Winter NAMM 2017 to check out the Starlight laser-targeting microphone. After the video, see Sweetwater's complete coverage of the Winter NAMM 2017 trade show here:... Read more »

ROLI Lightpad Block at Winter NAMM 2017

Sweetwater stops by the ROLI booth at Winter NAMM 2017 to check out the ROLI Lightpad Block portable music production system. After the video, see Sweetwater's complete coverage of the Winter NAMM 2017 trade show... Read more »

Dave Smith Instruments REV2 & Pioneer DJ Toraiz AS-1 Synthesizers at Winter NAMM 2017

Mitch Gallagher stops by the Dave Smith Instruments booth at Winter NAMM 2017 to check out the REV2 polyphonic analog synthesizer, as well as the Toraiz AS-1 synth by Pioneer DJ (developed with DSI technology)... Read more »

Tech Tip of the Day

01/24/2017
Should Guitar Amp Tubes Glow Blue?

Q: The tubes in my guitar amp are glowing blue instead of sort of a yellow glow. Are the tubes bad?

A: That blue glow is just a side effect of a power tube — a fluorescent glow in the blue spectrum. The tube is fine! It actually indicates that the vacuum inside the tube is very good, which is what allows this phenomenon to occur. It will not have any affect on the performance or tone of the amp.

HOWEVER: If you notice a red glow on the metal plates of the tubes, turn off the amp immediately. This indicates that the tube is overheating and is red hot. It's likely that the tube bias in the amp is set incorrectly, but there may be some other problem causing the tube to overheat. Have the amp checked by a technician before you use it again.

More Tech Tips

Word for the Day

01/24/2017
Slew

"Slew" refers to how quickly a circuit's output voltage can change; it's usually expressed in volts per microsecond. When it comes to pro audio equipment, this spec is usually referred to as the slew rate and is most commonly associated with amplifiers, but in fact applies to many types of gear. In amplifiers, a low slew rate "softens" the attack of a signal, "smearing" transients and sounding "mushy." Since high frequencies change in amplitude the fastest, this is where slew rate is most critical. An amp with a higher slew rate will sound "tighter" and more dynamic to our ears.

View Glossary