The Marconi company had two tube for this

Tweeter: Ruark 26mm silk dome

Ia------90 65 52 mA

Listening Impressions — Quieter Stage

To ensure the durability needed for constantly plugging this premium RCA Connector in and out

RiCable VISUS HDMI - Digital Video Cable HDMI 2.1 Bandwidth 50 Gbps 8K/10K Step Up Transformer The Marconi company had twoTransporting the Audio Video signal from the source to the destination Visus HDMI is the first HDMI 2. 1 cable with full support for 8K 10K resolutions, dynamic HDR and eARC. Designed from the ground up for full support of FRL (Fixed Rate Link) signal transfer technology, it will guarantee you a unique view of your 8K content. +30% more performance than a standard cable*. Bandwidth >50 Gbps Conductors 25 AWG Copper OCC Triple Enhanced Shielding