Pin compatible with the ECC32 and draws the same heater current (0.95 A), but has roughly 30% the mu of an ECC32 (11.5 vs 32) and much lower ra (5.2 kΩ vs 16.5 kΩ). Not a direct substitute.
Va(b) max of 550 V is the maximum anode voltage at zero anode current (no-signal or blocked condition), not the operating maximum.
Rh-k max of 20 kΩ limits the heater-to-cathode bias resistor — relevant in elevated-cathode circuits.
Pin Layout — Octal
1Control Grid (section 2)
2Anode (section 2)
3Cathode (section 2)
4
Socket-Compatible Tubes ⚠ Not electrically compatible