Cayin N8ii is the newest TOTL DAP on the market. It uses a full-balanced, KORG tube circuit with Class A amplification, and it's priced at $3499.
xDuoo TA-26 is a headphone tube amplifier using 6N8P and 6N5P tubes. It is priced at $319.
LittleDot MK III SE is a fully balanced hybrid headphone amplifier by this legendary Chinese manufacturer. It pushes up to 2.5W per channel and it's priced at $499.
Cayin C9 is a flagship transportable fully balanced portable tube amp that can output up to a whopping 4.1W at 16 ohms. It'll cost you just shy of $1999.
LittleDot MK IV is a tube headphone amplifier that can also work as a preamplifier. It is priced at 499$.