Tube cross-reference
KT88 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the KT88 power - beam (not sweep). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for KT88
The following tubes are recorded as possible replacements for KT88. This direction does not establish that KT88 can replace them.
Power - Beam (NOT sweep)
The database records 6550 as a possible replacement forKT88.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Beam (NOT sweep) | Power - Beam (NOT sweep) |
| Construction | BeamPower | BeamPower |
| Base | Not recorded | Not recorded |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 1.6 A | 1.6 A |
Where KT88 can be used as the replacement
In these recorded relationships, KT88 is the replacement tube. The listed original tubes are not automatically suitable as replacements for KT88.
Power - Triode
The database records KT88 as a possible replacement for6080.
No special restrictions are recorded for this substitution.
| Specification | KT88 replacement | Original tube |
|---|---|---|
| Tube type | Power - Beam (NOT sweep) | Power - Triode |
| Construction | BeamPower | Triode-Triode |
| Base | Not recorded | 8BD |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 1 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 1.6 A | 2.5 A |
Power - Beam (NOT sweep)
The database records KT88 as a possible replacement for6550.
No special restrictions are recorded for this substitution.
| Specification | KT88 replacement | Original tube |
|---|---|---|
| Tube type | Power - Beam (NOT sweep) | Power - Beam (NOT sweep) |
| Construction | BeamPower | BeamPower |
| Base | Not recorded | Not recorded |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 1.6 A | 1.6 A |
Power - Beam (NOT sweep)
The database records KT88 as a possible replacement for6CA7.
No special restrictions are recorded for this substitution.
| Specification | KT88 replacement | Original tube |
|---|---|---|
| Tube type | Power - Beam (NOT sweep) | Power - Beam (NOT sweep) |
| Construction | BeamPower | BeamPower |
| Base | Not recorded | 8ET |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 1.6 A | 1.5 A |
Power - Beam (NOT sweep)
The database records KT88 as a possible replacement for7027A.
No special restrictions are recorded for this substitution.
| Specification | KT88 replacement | Original tube |
|---|---|---|
| Tube type | Power - Beam (NOT sweep) | Power - Beam (NOT sweep) |
| Construction | BeamPower | BeamPower |
| Base | Not recorded | 7AC |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 1.6 A | 0.9 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 KT88 specifications →