Tube cross-reference
KT63 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the KT63 power - tetrode (not beam). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for KT63
The following tubes are recorded as possible replacements for KT63. This direction does not establish that KT63 can replace them.
Power - Pentode (NOT beam)
The database records 6F6G as a possible replacement forKT63.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Tetrode (NOT beam) | Power - Pentode (NOT beam) |
| Construction | Tetrode | Pentode |
| Base | Not recorded | 7S |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.7 A | 0.7 A |
Where KT63 can be used as the replacement
In these recorded relationships, KT63 is the replacement tube. The listed original tubes are not automatically suitable as replacements for KT63.
Power - Pentode (NOT beam)
The database records KT63 as a possible replacement for6F6G.
No special restrictions are recorded for this substitution.
| Specification | KT63 replacement | Original tube |
|---|---|---|
| Tube type | Power - Tetrode (NOT beam) | Power - Pentode (NOT beam) |
| Construction | Tetrode | Pentode |
| Base | Not recorded | 7S |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.7 A | 0.7 A |
Verify before substituting
Matching a base or heater voltage is not enough to prove that two tubes are interchangeable. Check pin connections, heater current, maximum ratings, bias requirements, warm-up behavior, and the equipment manufacturer’s service documentation before making a substitution.
View the complete KT63 specifications →