@strateahed Great link. It seemed from what others said that this tube won't substitute? (Or maybe needs to be checked?)
In the link you provided, I liked this paragraph:
"1st Place (tie): Genalex Gold Lion KT77 ($49.95 each. All prices in USD) Essentially, a perfect tube. Quiet and unfussy. It works with every musical genre. The sound quality is right up there with the Shuguang black bottles but this comes at half the price. This tube does it all–huge reserves of power and headroom, a massive airy soundstage but in this case airiness is not a sign of thinness or an unsaturated midrange. For hard rock and complex orchestral music, here’s your tube. It’s no slouch with jazz but tone freaks seeking an even more saturated midrange might prefer the Mullards or the Tung-Sols. Highs are unusually detailed and well defined but never glassy or edgy. This tube excels in scraping up micro details. The bass is deep and dry, not quite as punchy and elastic and ripe as the SED Winged C or the Tung Sol EL34B, but bone dry. There is a touch of warmth but this tube is not a tone freak’s dream. It’s more neutral. This is the only serious challenger to Shuguang and Psvane’s best offerings, and again, it’s half the price. My vote for the King of the EL34-family."
In the link you provided, I liked this paragraph:
"1st Place (tie): Genalex Gold Lion KT77 ($49.95 each. All prices in USD) Essentially, a perfect tube. Quiet and unfussy. It works with every musical genre. The sound quality is right up there with the Shuguang black bottles but this comes at half the price. This tube does it all–huge reserves of power and headroom, a massive airy soundstage but in this case airiness is not a sign of thinness or an unsaturated midrange. For hard rock and complex orchestral music, here’s your tube. It’s no slouch with jazz but tone freaks seeking an even more saturated midrange might prefer the Mullards or the Tung-Sols. Highs are unusually detailed and well defined but never glassy or edgy. This tube excels in scraping up micro details. The bass is deep and dry, not quite as punchy and elastic and ripe as the SED Winged C or the Tung Sol EL34B, but bone dry. There is a touch of warmth but this tube is not a tone freak’s dream. It’s more neutral. This is the only serious challenger to Shuguang and Psvane’s best offerings, and again, it’s half the price. My vote for the King of the EL34-family."