Tube cross-reference
M8081 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the M8081 voltage - dual triode (similar high frequency). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for M8081
The following tubes are recorded as possible replacements for M8081. This direction does not establish that M8081 can replace them.
Voltage - Dual Triode (similar high frequency)
The database records 6J6 as a possible replacement forM8081.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar high frequency) | Voltage - Dual Triode (similar high frequency) |
| Construction | Triode-Triode | Triode-Triode |
| Base | Not recorded | 7BF |
| Socket | Not recorded | B7G |
| Base pins | Not recorded | 7 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.45 A | 0.45 A |
Where M8081 can be used as the replacement
In these recorded relationships, M8081 is the replacement tube. The listed original tubes are not automatically suitable as replacements for M8081.
Voltage - Dual Triode (similar)
The database records M8081 as a possible replacement for6099.
No special restrictions are recorded for this substitution.
| Specification | M8081 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar high frequency) | Voltage - Dual Triode (similar) |
| Construction | Triode-Triode | Triode-Triode |
| Base | Not recorded | Not recorded |
| Socket | Not recorded | IO |
| Base pins | Not recorded | 8 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.45 A | 0.45 A |
Voltage - Dual Triode (similar)
The database records M8081 as a possible replacement for6101.
No special restrictions are recorded for this substitution.
| Specification | M8081 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar high frequency) | Voltage - Dual Triode (similar) |
| Construction | Triode-Triode | Triode-Triode |
| Base | Not recorded | 7BF |
| Socket | Not recorded | B7G |
| Base pins | Not recorded | 7 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.45 A | 0.45 A |
Rectifier - Full Wave
The database records M8081 as a possible replacement for6106.
No special restrictions are recorded for this substitution.
| Specification | M8081 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar high frequency) | Rectifier - Full Wave |
| Construction | Triode-Triode | Rectifier-Rectifier |
| Base | Not recorded | Not recorded |
| Socket | Not recorded | IO |
| Base pins | Not recorded | 8 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 5 V |
| Heater current | 0.45 A | 1.7 A |
Specialized - Gauge Tube
The database records M8081 as a possible replacement for6535.
No special restrictions are recorded for this substitution.
| Specification | M8081 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar high frequency) | Specialized - Gauge Tube |
| Construction | Triode-Triode | Gauge |
| Base | Not recorded | 8FR |
| Socket | Not recorded | Not recorded |
| Base pins | Not recorded | 8 |
| Sections | 2 | 1 |
| Heater voltage | 6.3 V | Not recorded |
| Heater current | 0.45 A | 0.017 A |
Voltage - Dual Triode (similar high frequency)
The database records M8081 as a possible replacement for6J6.
No special restrictions are recorded for this substitution.
| Specification | M8081 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar high frequency) | Voltage - Dual Triode (similar high frequency) |
| Construction | Triode-Triode | Triode-Triode |
| Base | Not recorded | 7BF |
| Socket | Not recorded | B7G |
| Base pins | Not recorded | 7 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.45 A | 0.45 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 M8081 specifications →