RCA 12AU7A vs Telefunken 12AX7 Tube Tone Comparison Gain Difference

In this video I sound test 2 preamp tubes, a Telefunken ribbed plate round getter 12AX7 and a RCA clear top 12AU7A ECC827 using my Hamer Slammer Telecaster through my Peavey XXX 112 combo amp. You be the judge on which you prefer.