Bay Crt Monitor | 5.25 Drive

A more feasible but absurd approach: Drive the tube in (vector display), eliminating horizontal/vertical oscillators. The electron beam would be steered by DACs, enabling oscilloscope-like graphics at low refresh rates (< 100 Hz). The bandwidth would be < 50 kHz, unsuitable for video but sufficient for retro system monitors. 5. Safety and Regulatory Compliance CRTs are vacuum envelopes under significant stress (atmospheric pressure ~10 tons/m² on a 40×40 mm faceplate). A 5.25-inch tube’s glass thickness would be < 1.5 mm to save depth. Implosion risk is extreme. Furthermore, the 8 kV anode would be millimeters away from the metal drive bay chassis. Creepage and clearance distances required by UL/CSA (minimum 6 mm at 8 kV) are impossible. The device would arc through air to the chassis, shocking the user and destroying the motherboard. 6. Proposed Theoretical Design (Unrealized) We present a specification for the BayTube BT-1 , a non-functional conceptual device:

A CRT requires a minimum neck length proportional to deflection angle. For a 40 mm screen width, a standard 90° deflection tube would require a depth of ~40 mm from screen face to yoke. However, the electron gun assembly alone adds 50–60 mm. Thus, the total depth exceeds 110 mm, fitting the 203 mm bay depth only if the PCB is relocated externally. A 110° or 120° deflection tube could shorten depth to ~35 mm, but such tubes exist only as experimental designs due to corner focus distortion. 5.25 drive bay crt monitor

Use electrostatic deflection (like an oscilloscope tube) to eliminate yoke power, saving ~10 W. However, electrostatic deflection requires extremely high deflection plate voltages (±300V) and severely limits scan angle, reducing screen size to <25 mm diagonal. 4. Electrical and Signal Interface A standard VGA or composite video signal requires horizontal scan rates of 15.75 kHz (NTSC) to 31.5 kHz (VGA). A 5.25-inch CRT would need to support these rates, but the flyback transformer for even 8 kV at 31 kHz is physically larger than the bay. Option: Use a DC-DC converter and a custom ferrite-core flyback. Miniature flybacks exist (e.g., in camera flashes), but they cannot sustain continuous operation at CRT scan rates without arcing. A more feasible but absurd approach: Drive the