Tube cross-reference
6155 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6155 power - tetrode (not beam) (over 1000v 100w). Compare core specifications and verify every restriction before using a replacement.
Exact variations of 6155
These designations belong to the same electrical variation group. Their names may differ because of international standards, manufacturing tolerances, or materials, but they are recorded as electrically equivalent—not merely substitutes.
QB3300 Power - Tetrode (NOT beam) (over 1000V 100W)
- Base
- Not recorded
- Socket
- Not recorded
- Base pins
- Not recorded
- Sections
- 1
- Heater voltage
- 5 V
- Heater current
- 6.5 A
Replacement tubes for 6155
The following tubes are recorded as possible replacements for 6155. This direction does not establish that 6155 can replace them.
Power - Tetrode (NOT beam) (over 1000V 100W)
The database records 4D21 as a possible replacement for6155.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Tetrode (NOT beam) (over 1000V 100W) | Power - Tetrode (NOT beam) (over 1000V 100W) |
| Construction | Tetrode | Tetrode |
| Base | Not recorded | Not recorded |
| Socket | Not recorded | J4 |
| Base pins | Not recorded | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 5 V | 5 V |
| Heater current | 6.5 A | 6.5 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 6155 specifications →