Tube cross-reference
1S5 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 1S5 voltage pentode or tetrode (under 100v). Compare core specifications and verify every restriction before using a replacement.
Exact variations of 1S5
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.
DAF91 Voltage Pentode or Tetrode (under 100V)
- Base
- B7G
- Socket
- B7G
- Base pins
- 7
- Sections
- 2
- Heater voltage
- 1.4 V
- Heater current
- 0.05 A
Replacement tubes for 1S5
The following tubes are recorded as possible replacements for 1S5. This direction does not establish that 1S5 can replace them.
Voltage Pentode or Tetrode (with diode)
The database records 1FD9 as a possible replacement for1S5.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode or Tetrode (under 100V) | Voltage Pentode or Tetrode (with diode) |
| Construction | Diode-Pentode | Diode-Pentode |
| Base | 6AU | Not recorded |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 2 | 2 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.05 A | 0.05 A |
Voltage Pentode or Tetrode (under 100V)
The database records DAF91 as a possible replacement for1S5.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode or Tetrode (under 100V) | Voltage Pentode or Tetrode (under 100V) |
| Construction | Diode-Pentode | Diode-Pentode |
| Base | 6AU | B7G |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 2 | 2 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.05 A | 0.05 A |
Voltage Pentode or Tetrode (under 100V)
The database records ZD17 as a possible replacement for1S5.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode or Tetrode (under 100V) | Voltage Pentode or Tetrode (under 100V) |
| Construction | Diode-Pentode | Diode-Pentode |
| Base | 6AU | B7G |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 2 | 2 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.05 A | 0.05 A |
Voltage Pentode or Tetrode (with diode)
The database records 1AF5 as a possible replacement for1S5.
- Parallel heater circuits only
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode or Tetrode (under 100V) | Voltage Pentode or Tetrode (with diode) |
| Construction | Diode-Pentode | Diode-Pentode |
| Base | 6AU | 6AU |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 2 | 2 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.05 A | 0.025 A |
Voltage Pentode or Tetrode (under 100V)
The database records 1AH5 as a possible replacement for1S5.
- Parallel heater circuits only
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode or Tetrode (under 100V) | Voltage Pentode or Tetrode (under 100V) |
| Construction | Diode-Pentode | Diode-Pentode |
| Base | 6AU | TDJ |
| Socket | B7G | Not recorded |
| Base pins | 7 | 7 |
| Sections | 2 | 2 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.05 A | 0.025 A |
Where 1S5 can be used as the replacement
In these recorded relationships, 1S5 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 1S5.
Voltage Pentode or Tetrode (with diode)
The database records 1S5 as a possible replacement for1FD9.
No special restrictions are recorded for this substitution.
| Specification | 1S5 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode or Tetrode (under 100V) | Voltage Pentode or Tetrode (with diode) |
| Construction | Diode-Pentode | Diode-Pentode |
| Base | 6AU | Not recorded |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 2 | 2 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.05 A | 0.05 A |
Voltage - Triode (with diode, heptode or hexode)
The database records 1S5 as a possible replacement forDAC21.
No special restrictions are recorded for this substitution.
| Specification | 1S5 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode or Tetrode (under 100V) | Voltage - Triode (with diode, heptode or hexode) |
| Construction | Diode-Pentode | Diode-Triode |
| Base | 6AU | Not recorded |
| Socket | B7G | Not recorded |
| Base pins | 7 | Not recorded |
| Sections | 2 | 2 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.05 A | 0.05 A |
Voltage Pentode or Tetrode (under 100V)
The database records 1S5 as a possible replacement forDAF91.
No special restrictions are recorded for this substitution.
| Specification | 1S5 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode or Tetrode (under 100V) | Voltage Pentode or Tetrode (under 100V) |
| Construction | Diode-Pentode | Diode-Pentode |
| Base | 6AU | B7G |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 2 | 2 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.05 A | 0.05 A |
Voltage Pentode or Tetrode (under 100V)
The database records 1S5 as a possible replacement forZD17.
No special restrictions are recorded for this substitution.
| Specification | 1S5 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode or Tetrode (under 100V) | Voltage Pentode or Tetrode (under 100V) |
| Construction | Diode-Pentode | Diode-Pentode |
| Base | 6AU | B7G |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 2 | 2 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.05 A | 0.05 A |
Voltage Pentode or Tetrode (with diode)
The database records 1S5 as a possible replacement for1AF5.
- Parallel heater circuits only
| Specification | 1S5 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode or Tetrode (under 100V) | Voltage Pentode or Tetrode (with diode) |
| Construction | Diode-Pentode | Diode-Pentode |
| Base | 6AU | 6AU |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 2 | 2 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.05 A | 0.025 A |
Voltage Pentode or Tetrode (under 100V)
The database records 1S5 as a possible replacement for1AH5.
- Parallel heater circuits only
| Specification | 1S5 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode or Tetrode (under 100V) | Voltage Pentode or Tetrode (under 100V) |
| Construction | Diode-Pentode | Diode-Pentode |
| Base | 6AU | TDJ |
| Socket | B7G | Not recorded |
| Base pins | 7 | 7 |
| Sections | 2 | 2 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.05 A | 0.025 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 1S5 specifications →