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: $15.75
In Stock

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
Product Measurements by Type
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)0.029 lbs.
Product Measurements by Item
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 and Answers

Click each question to see its answers.
Asked by Anonymous on January 12th, 2016.
JustinG
January 13th, 2016
Staff Member
Top Contributor
experimenting with preamp tubes is always a good idea if you dislike certain characteristics of your sound. Going with a tube lacking in lows would definitely help the situation.
Asked by Anonymous on March 30th, 2017.
Matt H.
March 30th, 2017
Staff Member
Yes, if the S6 calls for 12AX7's these will be compatible.
Asked by tigerdognew on July 13th, 2020.
BradWbr
July 13th, 2020
Staff Member
There is no difference between the two other than the pins. JJ does not use tighter tolerances on the gold pins than the standards.
Asked by Anonymous on April 25th, 2021.
BradWbr
April 26th, 2021
Staff Member
Both the manufacturer and other customers have reported these work quite well in HiFi applications, but these reports are subjective and your experience may vary.

Product Reviews

4.82 out of 5 based on 17 reviews
- 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.

- 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.

- 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!

- May 26th, 2020
5 out of 5

Great sound, great price

- January 28th, 2020
5 out of 5

When I first put this in my build, it came out very microphonic but after ten minutes it started to sound very good, nice tone! Rich and thick.

- November 21st, 2019
4 out of 5

Overall this seems like a great tube. Not as dark sounding as the JJ ECC83 but still very smooth sounding. Works great in V1 position on my pignose G40V. Only 4 stars because it produces a loud thump when used in V4 on a princeton reverb with the tremolo engaged. I tried 2 different ECC803's with the same result and did not have this issue with the standard JJ ECC83 or Sovtek 12ax7WA. Because of this I have to conclude that the noise has to do with the tube design and not the amp.

- November 21st, 2019
4 out of 5

Overall this seems like a great tube. Not as dark sounding as the JJ ECC83 but still very smooth sounding. Works great in V1 position on my pignose G40V. Only 4 stars because it produces a loud thump when used in V4 on a princeton reverb with the tremolo engaged. I tried 2 different ECC803's with the same result and did not have this issue with the standard JJ ECC83 or Sovtek 12ax7WA. Because of this I have to conclude that the noise has to do with the tube design and not the amp.

- October 10th, 2019
5 out of 5

Great sounding tube from a reliable electronics manufacturer. Does well in v1 and pi or really any position.

- September 14th, 2019
5 out of 5

Perfect pre-amp tubes strongly recommended

- May 16th, 2018
5 out of 5

This is an all around great tube by JJ. I use it in v2 also great in the phase inverter position. It's also very quiet for as large as the plates are and adds improved gain in preamp gain stages.