Vacuum Tube - 12DW7 / ECC832, JJ Electronics, Dual Triode
Pictured: Regular
Pictured: Gold
Pictured: Regular
Pictured: Gold
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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
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1 answers
Will this tube replace a 7247?
Asked by Anonymous on May 18th, 2018.
May 18th, 2018
Staff Member
According to our Tube Substitution Handbook, the 12DW7 is a substitute for the 7247.
Product Reviews
shipped promptly and as described
This tube was perfect in a Blues Junior cathode follower modification...very nice clear tone, non-microphonic, and worked exactly as planned. Would buy this tube again in a heartbeat...
tubes delivered in great shape, as allways with tubesandmore.com/ Antique Electronic Supply.
great selection on the website too.
thanks
I bought this as part of a re-tube for a Hot Rod Deluxe, and used it in V2 of the amp. Purchased with it were a 12AT7 (V1), a 12AX7 (V3-Phase invertor), and two matched 6L6GC's. All were JJ tubes. Prior to this re-tube, I had three 12AX7's in the amp. All I can say is WOW! Excellent tone, and volume control that is now manageable. I'm very pleased with the way this tube works in the HRDX. Definitely recommend it.
Also very pleased with Antique Electronic Supply. Easy to order. Quick shippers. I'm a longtime customer and will continue to do business with them.