Tube cross-reference
18GD6A alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 18GD6A voltage pentode - sharp cutoff (single). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 18GD6A
The following tubes are recorded as possible replacements for 18GD6A. This direction does not establish that 18GD6A can replace them.
Voltage Pentode - Remote Cutoff (single)
The database records 18FW6 as a possible replacement for18GD6A.
- No-warmup series circuits only
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Voltage Pentode - Remote Cutoff (single) |
| Construction | Pentode | Pentode |
| Base | Not recorded | 7CC |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 18 V | 18 V |
| Heater current | 0.1 A | 0.1 A |
Voltage Pentode - Remote Cutoff (single)
The database records 18FW6A as a possible replacement for18GD6A.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Voltage Pentode - Remote Cutoff (single) |
| Construction | Pentode | Pentode |
| Base | Not recorded | Not recorded |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 18 V | 18 V |
| Heater current | 0.1 A | 0.1 A |
Voltage Pentode - Sharp Cutoff (single)
The database records 18GD6 as a possible replacement for18GD6A.
- No-warmup series circuits only
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Voltage Pentode - Sharp Cutoff (single) |
| Construction | Pentode | Pentode |
| Base | Not recorded | Not recorded |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 18 V | 18 V |
| Heater current | 0.1 A | 0.1 A |
Where 18GD6A can be used as the replacement
In these recorded relationships, 18GD6A is the replacement tube. The listed original tubes are not automatically suitable as replacements for 18GD6A.
Voltage Pentode - Remote Cutoff (single)
The database records 18GD6A as a possible replacement for18FW6.
No special restrictions are recorded for this substitution.
| Specification | 18GD6A replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Voltage Pentode - Remote Cutoff (single) |
| Construction | Pentode | Pentode |
| Base | Not recorded | 7CC |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 18 V | 18 V |
| Heater current | 0.1 A | 0.1 A |
Voltage Pentode - Remote Cutoff (single)
The database records 18GD6A as a possible replacement for18FW6A.
No special restrictions are recorded for this substitution.
| Specification | 18GD6A replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Voltage Pentode - Remote Cutoff (single) |
| Construction | Pentode | Pentode |
| Base | Not recorded | Not recorded |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 18 V | 18 V |
| Heater current | 0.1 A | 0.1 A |
Voltage Pentode - Sharp Cutoff (single)
The database records 18GD6A as a possible replacement for18GD6.
No special restrictions are recorded for this substitution.
| Specification | 18GD6A replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Voltage Pentode - Sharp Cutoff (single) |
| Construction | Pentode | Pentode |
| Base | Not recorded | Not recorded |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| 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 18GD6A specifications →