Tube cross-reference
18FY6 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 18FY6 voltage - triode (with diode, heptode or hexode). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 18FY6
The following tubes are recorded as possible replacements for 18FY6. This direction does not establish that 18FY6 can replace them.
Voltage - Triode (with diode, heptode or hexode)
The database records 18FY6A as a possible replacement for18FY6.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Triode (with diode, heptode or hexode) | Voltage - Triode (with diode, heptode or hexode) |
| Construction | Diode-Diode-Triode | Diode-Diode-Triode |
| Base | Not recorded | Not recorded |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 3 | 3 |
| Heater voltage | 18 V | 18 V |
| Heater current | 0.1 A | 0.1 A |
Voltage - Triode (with diode, heptode or hexode)
The database records 18GE6 as a possible replacement for18FY6.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Triode (with diode, heptode or hexode) | Voltage - Triode (with diode, heptode or hexode) |
| Construction | Diode-Diode-Triode | Diode-Diode-Triode |
| Base | Not recorded | Not recorded |
| Socket | B7G | B9A |
| Base pins | 7 | 7 |
| Sections | 3 | 3 |
| Heater voltage | 18 V | 18 V |
| Heater current | 0.1 A | 0.1 A |
Voltage - Triode (with diode, heptode or hexode)
The database records 18GE6A as a possible replacement for18FY6.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Triode (with diode, heptode or hexode) | Voltage - Triode (with diode, heptode or hexode) |
| Construction | Diode-Diode-Triode | Diode-Diode-Triode |
| Base | Not recorded | Not recorded |
| Socket | B7G | B9A |
| Base pins | 7 | 7 |
| Sections | 3 | 3 |
| Heater voltage | 18 V | 18 V |
| Heater current | 0.1 A | 0.1 A |
Where 18FY6 can be used as the replacement
In these recorded relationships, 18FY6 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 18FY6.
Voltage - Triode (with diode, heptode or hexode)
The database records 18FY6 as a possible replacement for18FY6A.
- No-warmup series circuits only
| Specification | 18FY6 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Triode (with diode, heptode or hexode) | Voltage - Triode (with diode, heptode or hexode) |
| Construction | Diode-Diode-Triode | Diode-Diode-Triode |
| Base | Not recorded | Not recorded |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 3 | 3 |
| Heater voltage | 18 V | 18 V |
| Heater current | 0.1 A | 0.1 A |
Voltage - Triode (with diode, heptode or hexode)
The database records 18FY6 as a possible replacement for18GE6.
No special restrictions are recorded for this substitution.
| Specification | 18FY6 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Triode (with diode, heptode or hexode) | Voltage - Triode (with diode, heptode or hexode) |
| Construction | Diode-Diode-Triode | Diode-Diode-Triode |
| Base | Not recorded | Not recorded |
| Socket | B7G | B9A |
| Base pins | 7 | 7 |
| Sections | 3 | 3 |
| Heater voltage | 18 V | 18 V |
| Heater current | 0.1 A | 0.1 A |
Voltage - Triode (with diode, heptode or hexode)
The database records 18FY6 as a possible replacement for18GE6A.
- No-warmup series circuits only
| Specification | 18FY6 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Triode (with diode, heptode or hexode) | Voltage - Triode (with diode, heptode or hexode) |
| Construction | Diode-Diode-Triode | Diode-Diode-Triode |
| Base | Not recorded | Not recorded |
| Socket | B7G | B9A |
| Base pins | 7 | 7 |
| Sections | 3 | 3 |
| Heater voltage | 18 V | 18 V |
| Heater current | 0.1 A | 0.1 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 18FY6 specifications →