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 24 reviews
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.

tigerdognew - August 1st, 2020
5 out of 5

I have an unusual stereo preamp from the 1970s that uses 4x 12AX7s in the phono section and two in the line side. Long-plate JJ gold-pins are just the ticket for this bit of kit.

For years, I ran a set of (apparently rebranded) Chinese 12AX7WAs that were "meh" at best. I replaced them with JJ short-plate 12AX7s and didn't like the result at all; to my ears they were not suited for this role; they'd be great in a guitar amp. I put two of the old tubes in the line stage, and replaced the phono stage with Mullards, which sounded nice until one failed prematurely. Guessing maybe the longer-plate design of the Russian Mullards were helping, I sprung for four JJ gold-pin long-plate 12AX7s. The noise floor (measured using Audacity and a high-res PC sound card) is lower than the Mullards and the sound is just as liquid, to my ears. So now, JJs in the phono, Mullards in the line. I'm happy!