Yes on upscale audio. When tubes were unavailable several years ago, I purchased a quad of kt150’s from an outlet in Canada. Within 8-9 months, three out of four went badly microphonic. Past the 6 months warranty. When tubes became available thru Upscale, I bought a new quad, and no problems since then. These through a Dialogue Premium from Upscale Audio. I trusted the sales pitch, and I’m happy. I went from EL34’s to KT66’s to the 150’s. Just love the 150’s. 3 out of 4 bad so quickly was too discouraging.
Rolling KT150s in Primaluna hp integrated
I’m a mere five hours into these. This is an alive and kicking tube. It’s like it had a double espresso before the music starts. I’m hearing big and strong delivery, but that’s so overwhelming that I cannot focus on midrange. It’s clear I need some time with these.