Cross-reference · safe drop-ins

Tube Substitution / Cross-Reference Tool

Look up common preamp, power, and rectifier tube substitutions — what's a safe drop-in, what needs a rebias, and what changes about heater current or socket.

Bench tool

⚠ This reflects commonly published tube manual specs, but manufacturers vary and amps get modified. Always confirm plate dissipation, heater current, and bias range against the datasheet for the exact tube in hand and re-check bias after any power tube swap.