The biggest CRT ever made: Sony's PVM-4300

Original Article ↗ Hacker News Discussion ↗

Scale, weight, and cost

  • The PVM‑4300 weighed ~450 lb, drawing comparisons to pianos and car engines.
  • At ~$40k in 1989 (≈$100k today), it sat in extreme high‑end territory.
  • Many anecdotes describe similarly huge consumer CRTs (32–40") that needed multiple people, special furniture, or even structural consideration for floors.

Rarity and use cases

  • A 1990 news article said Sony had sold only three units by then; commenters wonder how many survive.
  • PVM‑series units are clarified as professional broadcast monitors, not consumer TVs.
  • Some trade shows reportedly rented them as spectacle pieces.

Engineering constraints on big CRTs

  • Major weight comes from thick front glass needed for vacuum, durability, and phosphor support.
  • Debate: some say less glass is structurally sufficient for vacuum; others note living‑room sets must be child‑safe and sturdy.
  • Glass also serves as X‑ray shielding and contains significant lead, especially in neck/funnel.
  • Larger tubes need higher voltages, stronger electron beams, and complex magnetic focusing, all adding bulk.

Late CRT innovation

  • Discussion of thinner, wide‑deflection CRTs like Samsung’s 2005 Vixlim; considered “peak CRT” but obsolete on arrival.
  • Mentions of metal‑cone CRTs and exotic folded‑beam prototypes; issues with reliability and insulation limited adoption.
  • Field Emission Displays were a hoped‑for successor but lost to ever‑cheaper LCDs.

Other large‑screen technologies

  • “Big screen TVs” in 80s–90s media were usually CRT projection sets (rear or front), not gigantic direct‑view tubes.
  • Eidophor and other projection systems are cited as niche big‑venue tech.

Retro gaming and image quality

  • Many praise CRTs and especially Trinitrons for motion, color, and handling of low resolutions.
  • Others note high‑end HD CRTs often look worse for 240p/480i than SD sets, and that modern FPGA‑based consoles with HDMI are excellent alternatives.
  • Latency‑adding processing (e.g., IDTV features) is flagged as undesirable for competitive gaming.

Plasma, LCD, OLED, microLED

  • Plasma is fondly remembered for image quality but criticized for heat, power draw, and aging noise.
  • OLED and prospective microLED are discussed as spiritual successors; cost and manufacturing limits remain key constraints.