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Pictured: Regular
Pictured: Gold
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Vacuum Tube - ECC803 / 12AX7, JJ Electronics, Long Plate
The JJ Electronic ECC803 is a high performance, long plate version of the ECC83 / 12AX7. Like all JJ preamp tubes, these are built into a rugged package using the spiral filament and robust plate structure resulting in low microphonics and high reliability. The long plate version of this tube differs from the standard version with its stronger and fuller sound which offers a wider and more balanced frequency response. This tube ranges from deep rich lows to pristine highs covering a spectrum of harmonically dynamic mids along the way. This tube is an excellent choice for any guitar amp and perfect for studio and Hi-Fi equipment as well. This tube will work in any 12AX7 or ECC83 position.
RoHS Compliant
Accessory Items:
| Pin Type | Our Part Number | UPC/EAN | JJ Electronics Part Number |
|---|---|---|---|
| Gold | T-ECC803-GLD-JJ | 609722123556 | ECC803S - GOLD |
| Regular | T-ECC803-S-JJ | 609722126533 | ECC803S |
| Body Height | 51.2 mm | ||
| Cathode Current (Ik) | ≤ 9 mA | ||
| Filament Current (If) | 300 / 150 mA | ||
| Filament Voltage (Uf) | 6.3 / 12.6 V | ||
| Gain (μ) | 100 | ||
| Grid Circuit Resistance (Rg) | 2,2 MΩ | ||
| Grid capacitance (cg1) | 1.6 pF | ||
| Grid to Plate Capacitance (ca/g) | 1.7 pF | ||
| Heater to cathode voltage (Uk/f) | ≤ 100 V | ||
| Internal Resistance (Ri) | 62.5 kΩ | ||
| Item Diameter | 22.2 mm | ||
| Item Height | 57.6 mm | ||
| Plate Capacitance (ca) | 0.46 pF | ||
| Plate Current (Ia) | 1.2 mA | ||
| Plate Dissipation (Wa) | ≤ 1.2 W | ||
| Plate Voltage (Ua) | ≤ 300 V, 250 V typical | ||
| Transconductance (S) | 1.6 mA/V | ||
| Packaging Dimensions | 1 in. × 1 in. × 2.5 in. | ||
| Weight (Packaging) | Gold version | T-ECC803-GLD-JJ | 0.0287 lbs. |
| Regular version | T-ECC803-S-JJ | 0.0309 lbs. | |
| T-ECC803-S-JJ - Regular version | Body Height | 51.2 mm |
| Cathode Current (Ik) | ≤ 9 mA | |
| Filament Current (If) | 300 / 150 mA | |
| Filament Voltage (Uf) | 6.3 / 12.6 V | |
| Gain (μ) | 100 | |
| Grid Circuit Resistance (Rg) | 2,2 MΩ | |
| Grid capacitance (cg1) | 1.6 pF | |
| Grid to Plate Capacitance (ca/g) | 1.7 pF | |
| Heater to cathode voltage (Uk/f) | ≤ 100 V | |
| Internal Resistance (Ri) | 62.5 kΩ | |
| Item Diameter | 22.2 mm | |
| Item Height | 57.6 mm | |
| Plate Capacitance (ca) | 0.46 pF | |
| Plate Current (Ia) | 1.2 mA | |
| Plate Dissipation (Wa) | ≤ 1.2 W | |
| Plate Voltage (Ua) | ≤ 300 V, 250 V typical | |
| Transconductance (S) | 1.6 mA/V | |
| T-ECC803-GLD-JJ - Gold version | Body Height | 51.2 mm |
| Cathode Current (Ik) | ≤ 9 mA | |
| Filament Current (If) | 300 / 150 mA | |
| Filament Voltage (Uf) | 6.3 / 12.6 V | |
| Gain (μ) | 100 | |
| Grid Circuit Resistance (Rg) | 2,2 MΩ | |
| Grid capacitance (cg1) | 1.6 pF | |
| Grid to Plate Capacitance (ca/g) | 1.7 pF | |
| Heater to cathode voltage (Uk/f) | ≤ 100 V | |
| Internal Resistance (Ri) | 62.5 kΩ | |
| Item Diameter | 22.2 mm | |
| Item Height | 57.6 mm | |
| Plate Capacitance (ca) | 0.46 pF | |
| Plate Current (Ia) | 1.2 mA | |
| Plate Dissipation (Wa) | ≤ 1.2 W | |
| Plate Voltage (Ua) | ≤ 300 V, 250 V typical | |
| Transconductance (S) | 1.6 mA/V |
 Specification Sheet | All Models |
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Product Reviews
Fantastic, fast service; great bargain! Amplified Parts will be my starting point for any tube purchase/advice.
I had a regular JJ ECC83 in my bass head that I replaced with the long plate version. There was a noticeable difference in my tone - it was less compressed and there was more headroom. I did not expect to hear such a difference. This is a great tube!
This is my favorite preamp tube. Imagine if a NOS RCA 12ax7 and a Telefunken Smooth plate made love. This would be that love child. Totally smooth and rich sweet tone. Gain is full and robust but not overpowering. Highs are sweet and super dynamic, mids are strong, lows are deep and bassy. Like I said - Mother Of All 12ax7s!