Electrically similar Rimlock rectifier but different base (B8A vs Octal) — not pin-compatible
Electrical Specifications
Absolute Maximum
Anode Voltage (max)AC Voltage per Plate (max RMS)350V
Rectifier
Peak Inverse VoltagePeak Inverse Voltage1,400V
Voltage Drop (typical)Voltage Drop (typical)20V
Max C-input Filter CapacitorMax C-input Filter Capacitor50µF
Notes
Indirectly heated (cathode sleeve) — provides slow ramp-up of B+ voltage, reducing cathode stripping in signal and output tubes compared to directly heated rectifiers like 5U4G.
Pin 1 is an internal metallisation/shield connection, not a no-connection pin. It should be grounded for proper shielding.
CV1864 is listed by TDSL as a different-rating substitute — verify ratings before substituting.
Voltage drop data (20 V) sourced from tubemaze.info measurement comparison (https://tubemaze.info/sound-of-rectifier/), not from the manufacturer datasheet.
Pin Layout — Octal
1Internal Connection (metallisation)
2Heater
3No Connection
4
Socket-Compatible Tubes ⚠ Not electrically compatible