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Pictured: Regular
Pictured: Gold
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Vacuum Tube - 12DW7 / ECC832, JJ Electronics, Dual Triode
In the 12DW7/ECC832, Section 1 of the tube (pins 6, 7, and 8) is the high gain 12AX7/ECC83 spec (gain factor 100) and Section 2 (pins 1, 2, and 3) is the low gain 12AU7/ECC82 spec (gain factor 17).
| ECC832 (T-12DW7-JJ-X) | ||
| Section 1 | Section 2 | |
| Pins | 6, 7, 8 | 1, 2, 3 |
| Gain | Factor of 100 | Factor of 17 |
| Spec | 12AX7/ECC83 | 12AU7/ECC82 |
| ECC823 (T-ECC823-JJ) | ||
| Section 1 | Section 2 | |
| Pins | 6, 7, 8 | 1, 2, 3 |
| Gain | Factor of 17 | Factor of 100 |
| Spec | 12AU7/ECC82 | 12AX7/ECC83 |
RoHS Compliant
Accessory Items:
| Pin Type | Our Part Number | UPC/EAN | JJ Electronics Part Number |
|---|---|---|---|
| Gold | T-12DW7-GOLD-JJ | 609722123495 | ECC832 - GOLD |
| Regular | T-12DW7-JJ | 609722123501 | ECC832 - 12DW7 |
| Body Height | 49.2 mm | |
| Cathode Current, system I (Ik) | ≤ 8 mA | |
| Cathode Current, system II (Ik) | ≤ 20 mA | |
| Filament Current (If) | 300 / 150 mA | |
| Filament Voltage (Uf) | 6.3 / 12.6 V | |
| Gain, System I (μ) | 100 | |
| Gain, System Ii (μ) | 17 | |
| Grid Resistance, system I (Rg) | 2.2 MΩ | |
| Grid Resistance, system II (Rg) | 1 MΩ | |
| Grid Voltage, system I (Ug) | ≥ -50 V, -2 V typical | |
| Grid Voltage, system II (Ug) | ≥ -50 V, -8.5 V typical | |
| Heater to cathode resistance, system I (Rk/f) | 150 kΩ | |
| Heater to cathode resistance, system II (Rk/f) | 150 kΩ | |
| Heater to cathode voltage, system I (Uk/f) | ≤ 180 V | |
| Heater to cathode voltage, system II (Uk/f) | ≤ 180 V | |
| Internal Resistance, system I (Ri) | 62.5 kΩ | |
| Internal Resistance, system II (Ri) | 7.7 kΩ | |
| Item Diameter | 22 mm | |
| Item Height | 56.3 mm | |
| Plate Current, system I (Ia) | 1.2 mA | |
| Plate Current, system II (Ia) | 10.5 mA | |
| Plate Dissipation, system I (Wa) | ≤ 1 W | |
| Plate Dissipation, system II (Wa) | ≤ 2.75 W | |
| Plate Voltage (Ua) | ≤ 300 V, 250 V typical | |
| Transconductance, system I (S) | 1.6 mA/V | |
| Transconductance, system II (S) | 2.2 mA/V |
| Packaging Dimensions | Gold version | T-12DW7-GOLD-JJ | 1 in. × 1 in. × 2.5 in. |
| Regular version | T-12DW7-JJ | 1 in. × 1 in. × 2.4 in. | |
| Weight (Packaging) | Gold version | T-12DW7-GOLD-JJ | 0.02 lbs. |
| Regular version | T-12DW7-JJ | 0.03 lbs. |
| T-12DW7-JJ - Regular version | Body Height | 49.2 mm |
| Cathode Current, system I (Ik) | ≤ 8 mA | |
| Cathode Current, system II (Ik) | ≤ 20 mA | |
| Filament Current (If) | 300 / 150 mA | |
| Filament Voltage (Uf) | 6.3 / 12.6 V | |
| Gain, System I (μ) | 100 | |
| Gain, System Ii (μ) | 17 | |
| Grid Resistance, system I (Rg) | 2.2 MΩ | |
| Grid Resistance, system II (Rg) | 1 MΩ | |
| Grid Voltage, system I (Ug) | ≥ -50 V, -2 V typical | |
| Grid Voltage, system II (Ug) | ≥ -50 V, -8.5 V typical | |
| Heater to cathode resistance, system I (Rk/f) | 150 kΩ | |
| Heater to cathode resistance, system II (Rk/f) | 150 kΩ | |
| Heater to cathode voltage, system I (Uk/f) | ≤ 180 V | |
| Heater to cathode voltage, system II (Uk/f) | ≤ 180 V | |
| Internal Resistance, system I (Ri) | 62.5 kΩ | |
| Internal Resistance, system II (Ri) | 7.7 kΩ | |
| Item Diameter | 22 mm | |
| Item Height | 56.3 mm | |
| Plate Current, system I (Ia) | 1.2 mA | |
| Plate Current, system II (Ia) | 10.5 mA | |
| Plate Dissipation, system I (Wa) | ≤ 1 W | |
| Plate Dissipation, system II (Wa) | ≤ 2.75 W | |
| Plate Voltage (Ua) | ≤ 300 V, 250 V typical | |
| Transconductance, system I (S) | 1.6 mA/V | |
| Transconductance, system II (S) | 2.2 mA/V | |
| T-12DW7-GOLD-JJ - Gold version | Body Height | 49.2 mm |
| Cathode Current, system I (Ik) | ≤ 8 mA | |
| Cathode Current, system II (Ik) | ≤ 20 mA | |
| Filament Current (If) | 300 / 150 mA | |
| Filament Voltage (Uf) | 6.3 / 12.6 V | |
| Gain, System I (μ) | 100 | |
| Gain, System Ii (μ) | 17 | |
| Grid Resistance, system I (Rg) | 2.2 MΩ | |
| Grid Resistance, system II (Rg) | 1 MΩ | |
| Grid Voltage, system I (Ug) | ≥ -50 V, -2 V typical | |
| Grid Voltage, system II (Ug) | ≥ -50 V, -8.5 V typical | |
| Heater to cathode resistance, system I (Rk/f) | 150 kΩ | |
| Heater to cathode resistance, system II (Rk/f) | 150 kΩ | |
| Heater to cathode voltage, system I (Uk/f) | ≤ 180 V | |
| Heater to cathode voltage, system II (Uk/f) | ≤ 180 V | |
| Internal Resistance, system I (Ri) | 62.5 kΩ | |
| Internal Resistance, system II (Ri) | 7.7 kΩ | |
| Item Diameter | 22 mm | |
| Item Height | 56.3 mm | |
| Plate Current, system I (Ia) | 1.2 mA | |
| Plate Current, system II (Ia) | 10.5 mA | |
| Plate Dissipation, system I (Wa) | ≤ 1 W | |
| Plate Dissipation, system II (Wa) | ≤ 2.75 W | |
| Plate Voltage (Ua) | ≤ 300 V, 250 V typical | |
| Transconductance, system I (S) | 1.6 mA/V | |
| Transconductance, system II (S) | 2.2 mA/V |
 Specification Sheet for Regular | T-12DW7-JJ |
| Specification Sheet for Gold | T-12DW7-GOLD-JJ |
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Questions and Answers
Click each question to see its answers.
1 answers
Will this tube replace a 7247?
Asked by Anonymous on May 18th, 2018.
According to our Tube Substitution Handbook, the 12DW7 is a substitute for the 7247.
1 answers
What difference with a 12ax7 if put in V1 ?
Asked by Anonymous on May 9th, 2021.
May 11th, 2021
Staff Member
This has a lower gain rating in the second section of the tube, so it may offer more clean headroom if used in V1 compared to a standard 12AX7.
1 answers
Would this tube work in v4 in a deluxe reverb to help keep the reverb lower on one side and provide the make gain on the other? I like to use a 12au7 or 12ay7 for v3. Would like to keep the reverb low and allow the 12ax7 to do its job as second gain stage for v2. Or is the tube orientation reversed?
Asked by BlackStrat7 on May 16th, 2023.
May 19th, 2023
Staff Member
We aren't sure which version would be the correct choice for you're application but JJ also makes the ECC823, T-ECC823-JJ, which is the same as this tube but with the sides flipped.
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