I know I sound like a broken record, I have had a lot of tube amps with my Klipsch Forte IVs and now my go to speakers are the Volti Razz, and never was satisfied until I took the leap and spent 5k on the First Watt Sit-4. With only 10 watts of class A it rocks my world. The music has a soul now and when my beautiful patience wife calls me for dinner I am always late wanting to play one more song. Forget about all those tubes, get it out of your mind…find one…I buy all my Pass and First watt from Jon at Refined Audio a awesome guy…call him…everything in the music is so sweet now with out worrying about a tube frying out…I am sure Jon will give you a audition time 30 days…