Tube cross-reference
6F6 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6F6 power - pentode (not beam). Compare core specifications and verify every restriction before using a replacement.
Exact variations of 6F6
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.
VT66 NEW (being researched)
- Base
- Not recorded
- Socket
- Not recorded
- Base pins
- Not recorded
- Sections
- 1
- Heater voltage
- Not recorded
- Heater current
- Not recorded
Replacement tubes for 6F6
The following tubes are recorded as possible replacements for 6F6. This direction does not establish that 6F6 can replace them.
Power - Pentode (NOT beam)
The database records 1611 as a possible replacement for6F6.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Pentode (NOT beam) |
| Construction | Pentode | Pentode |
| Base | 7S | Not recorded |
| Socket | IO | IO |
| Base pins | 8 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.7 A | 0.7 A |
Power - Pentode Single (NOT beam) (under 10W)
The database records 1621 as a possible replacement for6F6.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Pentode Single (NOT beam) (under 10W) |
| Construction | Pentode | Pentode |
| Base | 7S | 7S |
| Socket | IO | IO |
| Base pins | 8 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.7 A | 0.7 A |
Power - Pentode (NOT beam)
The database records 6F6G as a possible replacement for6F6.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Pentode (NOT beam) |
| Construction | Pentode | Pentode |
| Base | 7S | 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 |
Power - Pentode (NOT beam)
The database records 6F6GT as a possible replacement for6F6.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Pentode (NOT beam) |
| Construction | Pentode | Pentode |
| Base | 7S | 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 6F6 can be used as the replacement
In these recorded relationships, 6F6 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6F6.
Power - Pentode (NOT beam)
The database records 6F6 as a possible replacement for1611.
No special restrictions are recorded for this substitution.
| Specification | 6F6 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Pentode (NOT beam) |
| Construction | Pentode | Pentode |
| Base | 7S | Not recorded |
| Socket | IO | IO |
| Base pins | 8 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.7 A | 0.7 A |
Power - Pentode (NOT beam)
The database records 6F6 as a possible replacement for1613.
No special restrictions are recorded for this substitution.
| Specification | 6F6 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Pentode (NOT beam) |
| Construction | Pentode | Pentode |
| Base | 7S | Not recorded |
| Socket | IO | IO |
| Base pins | 8 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.7 A | 0.7 A |
Power - Pentode Single (NOT beam) (under 10W)
The database records 6F6 as a possible replacement for1621.
No special restrictions are recorded for this substitution.
| Specification | 6F6 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Pentode Single (NOT beam) (under 10W) |
| Construction | Pentode | Pentode |
| Base | 7S | 7S |
| Socket | IO | IO |
| Base pins | 8 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.7 A | 0.7 A |
Power - Pentode (NOT beam)
The database records 6F6 as a possible replacement for6F6G.
No special restrictions are recorded for this substitution.
| Specification | 6F6 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Pentode (NOT beam) |
| Construction | Pentode | Pentode |
| Base | 7S | 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 |
Power - Pentode (NOT beam)
The database records 6F6 as a possible replacement for6F6GT.
No special restrictions are recorded for this substitution.
| Specification | 6F6 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Pentode (NOT beam) |
| Construction | Pentode | Pentode |
| Base | 7S | 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 6F6 specifications →