The first thing I noticed about these headphones is that they have A LOT of bass. Coming from a history of mostly generally considered bass light headphones, this is a whole different cup of tea.
* Power cord and interconnection cables are not included.
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DACT CT2 stepped attenuator. $215
24-position, high accuracy and reliability
Teflon tube sockets upgrade:
$300 (9-pin x8)
Teflon is a superior material with great isolation and tempreture endurance. The unique design of multiple pin contact area greatly increase connectivity and gripping. Pins are gold-plated over oxygen free copper.
Drive tube replacement:
1 matched quad 12BZ7 $64 (4 pcs)
(ship in separate package)
NOS tubes. 12BZ7 is a direct replacement tube for a 12AX7.