GE 12AU7/6189W Vacuum Tube Review w/ Upscale Audio's Kevin Deal

Why I Can't Tell You Which Tubes To Buy, and some helpful TIPS! w/ Upscale Audio's Kevin Deal

PrimaLuna EVO 400 Tube Poweramp Review w/ Upscale Audio's Kevin Deal

Tube Lab #8 12AU7 Rolling

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Klipsch Jubilee Loudspeaker Review w/ Upscale Audio's Kevin Deal and Klipsch Audio's Roy Delgado

How to Spot Rare German 12AU7 Tubes featuring the RARE Siemens Silver Plate!

PrimaLuna EVO 400 Tube Preamplifier Review w/ Upscale Audio's Kevin Deal

VACUUM TUBE COMPARISON 6922/6DJ8/ECC88 type on NAT Audio SINGLE Tube integrated

PSVANE "Horizon" 12AU7: Listening Impressions - Review

Focal Kanta Loudspeaker Review w/ Upscale Audio's Kevin Deal & Kat Ourlian

Tube Lab #121 - Mullard, Philips & GE 12AX7's

Tube Shootout Telefunken vs. Mullard vs. Tung Sol (Vinyl Tonic)

PrimaLuna EVO 200 Integrated Amplifier Review w/ Upscale Audio's Kevin Deal

How A Tube Works

PrimaLuna EVO 300 Tube Power Amp Review w/ Upscale Audio's Kevin Deal

Pathos Logos Mk II Hybrid Integrated Amplifier w/ Upscale Audio's Kevin Deal

Pathos InPol2 Tube Hybrid Integrated Amp Review w/ Upscale Audio's Kevin Deal

What's More Important? Tube Preamp or Power Amp? Too Many Tubes? w/ Upscale Audio's Kevin Deal

PrimaLuna EVO 400 Integrated Tube Amp In-Depth Look w/ Upscale Audio's Kevin Deal

What are the differences between Class A, AB, and Class D amplifiers?