Vacuum tubes

[Damon Cassell]

Panasonic makes a high-end "audiophile" head unit for cars with a
vacuum tube. It even has swing-needle meters.

They bill it as the "world's best car receiver with a built-in vacuum
tube", which is ironic considering that these days, it's probably the
world's only car receiver with a built-in vacuum tube...

It's for the Japanese market, but is available in the US through
various gray market importers.

http://www.audiocubes.com/product_info.php?cPath=61_78&products_id=722

Damon