Vacuum Tube - ECC803 / 12AX7, JJ Electronics, Long Plate

Vacuum Tube - ECC803 / 12AX7, JJ Electronics, Long Plate

JJ Electronics
Pictured: Regular
Pictured: Regular
Pictured: Gold
Pictured: Gold
Pictured: Regular
Pictured: Regular
Pictured: Gold
Pictured: Gold
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Starting at: $22.95
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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.

SKU:
T-ECC803-JJ-X
Item ID:
004833
Brand:
JJ Electronics
RoHS Compliant
Part Numbers
Pin TypeOur Part NumberUPC/EANJJ Electronics Part Number
GoldT-ECC803-GLD-JJ609722123556 ECC803S - GOLD
RegularT-ECC803-S-JJ609722126533 ECC803S
Body Height51.2 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 Diameter22.2 mm
Item Height57.6 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 Information
Packaging Dimensions1 in. × 1 in. × 2.5 in.
Weight (Packaging)Gold versionT-ECC803-GLD-JJ0.0287 lbs.
Regular versionT-ECC803-S-JJ0.0309 lbs.
T-ECC803-S-JJ - Regular versionBody Height51.2 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 Diameter22.2 mm
Item Height57.6 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 versionBody Height51.2 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 Diameter22.2 mm
Item Height57.6 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

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet435.17 KB
Questions? Contact us at [email protected], or give us a call at 480-820-5411

Product Reviews

4.88 out of 5 based on 25 reviews
Ed Y - March 5th, 2024
5 out of 5

Two of these replaced a couple EH 12AX7s that were in positions V1 (input and tone stack recovery) and V3 (reverb recovery and final driver) in an Allen Chihuahua guitar amp. So far, so good. As reputed, the ECC803s seem to have a bit more gain and sound "fuller" than the previous tubes. A little tough to be specific about the ECC803, because I also replaced the JJ 6L6GC with a JJ 5881 (separate review). Like I've said to others, it's kind of like changing to a different brand of strings - things are different, but it will take a bit longer to sort out the details.

One caveat - the ECC8003s are also reputed to be bit noisier, and I think I can confirm that. I'm getting more white noise out of V1 at high volume settings. That said, I don't venture into that realm often.

Jim Thompson - May 9th, 2023
5 out of 5

Wow, retubed my old pre-amp and all I can say is WOW, .Very quite, very open and clean sound,

DaveL - May 7th, 2023
5 out of 5

I've never had a bad experience with JJ products. And Antique Electronic has great pricing and quick shipping!

mjm - March 11th, 2023
5 out of 5

these are nice sounding tubes

Mark C - January 10th, 2023
5 out of 5

Wow, regular shipping and possibly the USPS was way quicker than the order checkout listed. Packaging was appropriate and the boxes and tubes arrived in pristine condition. The sparkle has returned to my 64 year old tube amp (last rolled in 2005).

D. McCool - December 8th, 2022
5 out of 5

The JJ 12AX7 long plate has a strong muscular tone! Beautiful and robust! Highly recommend

Denton Perry - May 22nd, 2022
5 out of 5

Bought this for an early 70s Fender Champ along with a new JJ 5Y3 and 6V6. Certainly breathed new life into this little beauty.

Steve Hoover - April 14th, 2022
5 out of 5

Used this for a phase inverter slot, sounds great, so far so good.

T. Bass - June 29th, 2021
5 out of 5

Ordered this as a back up for the JJ in my Monoprice 5watt tuber. Monoprice has JJ's in both pre-amp and power (6V6) slots already, and the amp sounds fantastic as is. That said, I am doing a parallel speaker setup with a Randall 8" speaker cab, and OMG! We're talking "Baby-Marshall", that can be heard down the block when dimed. So far, so good with the JJ's.

Curt Fish - April 6th, 2021
5 out of 5

I bought these for an old Supro class A amplifier I own to use as an experiment. These things break up at the earliest hint of power. If you're looking for any clean headroom at all, these aren't the tubes for you. If you want vintage grit at any volume level, these are the real deal. I expected the lack of clean as it's what I was looking for with this amp. I got exactly what I hoped for. The flavor of the grit changes the more you drive them. Good stuff.