Tube cross-reference
HBC91 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the HBC91 voltage - triode (with diode, heptode or hexode). Compare core specifications and verify every restriction before using a replacement.
Exact variations of HBC91
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.
12AV6 Voltage - Triode (with diode, heptode or hexode)
- Base
- 7BT
- Socket
- B7G
- Base pins
- 7
- Sections
- 3
- Heater voltage
- 12.6 V
- Heater current
- 0.15 A
Replacement tubes for HBC91
The following tubes are recorded as possible replacements for HBC91. This direction does not establish that HBC91 can replace them.
Voltage - Triode (with diode, heptode or hexode)
The database records 12AV6 as a possible replacement forHBC91.
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 | 7BT |
| Socket | B7G | B7G |
| Base pins | Not recorded | 7 |
| Sections | 3 | 3 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.15 A | 0.15 A |
Where HBC91 can be used as the replacement
In these recorded relationships, HBC91 is the replacement tube. The listed original tubes are not automatically suitable as replacements for HBC91.
Voltage - Triode (with diode, heptode or hexode)
The database records HBC91 as a possible replacement for12AT6.
No special restrictions are recorded for this substitution.
| Specification | HBC91 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 | 7BT |
| Socket | B7G | B7G |
| Base pins | Not recorded | 7 |
| Sections | 3 | 3 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.15 A | 0.15 A |
Voltage - Triode (with diode, heptode or hexode)
The database records HBC91 as a possible replacement for12AV6.
No special restrictions are recorded for this substitution.
| Specification | HBC91 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 | 7BT |
| Socket | B7G | B7G |
| Base pins | Not recorded | 7 |
| Sections | 3 | 3 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.15 A | 0.15 A |
Voltage - Triode (with diode, heptode or hexode)
The database records HBC91 as a possible replacement for12BK6.
No special restrictions are recorded for this substitution.
| Specification | HBC91 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 | 7BT-0-2 |
| Socket | B7G | Not recorded |
| Base pins | Not recorded | 7 |
| Sections | 3 | 3 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.15 A | 0.15 A |
Voltage - Triode (with diode, heptode or hexode)
The database records HBC91 as a possible replacement for12BT6.
No special restrictions are recorded for this substitution.
| Specification | HBC91 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 | 7BT-0-2 |
| Socket | B7G | B7G |
| Base pins | Not recorded | 7 |
| Sections | 3 | 3 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.15 A | 0.15 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 HBC91 specifications →