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Vacuum Tube - EL34 II, JJ Electronics, Pentode
The JJ Electronic EL34 II is a different construction of the classic EL34 tube that offers a different tonal palette than the original. This tube has a more compact plate structure than standard EL34’s. The JJ EL34 II has an increased low to low-mid end with plenty of headroom to spare. This tube has a thick and tight bass response. The mids are balanced and harmonically rich with pleasantly smooth highs. The JJ EL34 II is stronger than the original but not harsh sounding in any way. When overdriven, this tube has a warm and dynamic distortion that rivals many vintage tubes.
Matched versions of this tube use Apex Matching
RoHS Compliant
| Single or Matched | Our Part Number | UPC/EAN |
|---|---|---|
| Single | T-EL34II-JJ | 841358101649 |
| Apex Matched Pair | T-EL34II-JJ-MP | 841358101663 |
| Apex Matched Quad | T-EL34II-JJ-MQ | 841358101670 |
| Body Height | 98 mm | |
| Cathode Current (Ik) | ≤ 150 mA | |
| Filament Current (If) | 1.5 A | |
| Filament Voltage (Uf) | 6.3 V | |
| Gain (μg2/g2) | 11 | |
| Grid 2 Dissipation (wg2) | 8 W | |
| Grid Capacitance (cg1) | 15.5 pF | |
| Grid Current 2 (Ig2) | 14.9 mA | |
| Grid Voltage 1 (Ug1) | -13.5 V typical | |
| Grid Voltage 2 (Ug2) | ≤ 450 V, 265 V typical | |
| Grid Voltage 3 (Ug3) | 0 V typical | |
| Grid to Plate Capacitance (ca/g) | 1.3 pF | |
| Heater to Cathode Voltage (Uk/f) | ≤ 100 V | |
| Heater to cathode resistance (Rk/f) | 20 kΩ | |
| Internal Resistance (Ri) | 15 kΩ | |
| Item Diameter | 33.3 mm | |
| Item Height | 112 mm | |
| Plate Capacitance (ca) | 10 pF | |
| Plate Current (Ia) | 100 mA | |
| Plate Dissipation (Wa) | ≤ 25 W | |
| Plate Voltage (Ua) | ≤ 800 V, 250 V typical | |
| Transconductance (S) | 11 mA/V |
| Packaging Dimensions | Apex Matched Pair version | T-EL34II-JJ-MP | 4.6 in. × 3.21 in. × 1.65 in. |
| Apex Matched Quad version | T-EL34II-JJ-MQ | 4.6 in. × 3.2 in. × 3.21 in. | |
| Single version | T-EL34II-JJ | 1.59 in. × 1.59 in. × 4.61 in. | |
| Weight (Packaging) | Apex Matched Pair version | T-EL34II-JJ-MP | 0.266 lbs. |
| Apex Matched Quad version | T-EL34II-JJ-MQ | 0.532 lbs. | |
| Single version | T-EL34II-JJ | 0.133 lbs. |
| T-EL34II-JJ-MP - Apex Matched Pair version | Body Height | 98 mm |
| Cathode Current (Ik) | ≤ 150 mA | |
| Filament Current (If) | 1.5 A | |
| Filament Voltage (Uf) | 6.3 V | |
| Gain (μg2/g2) | 11 | |
| Grid 2 Dissipation (wg2) | 8 W | |
| Grid Capacitance (cg1) | 15.5 pF | |
| Grid Current 2 (Ig2) | 14.9 mA | |
| Grid Voltage 1 (Ug1) | -13.5 V typical | |
| Grid Voltage 2 (Ug2) | ≤ 450 V, 265 V typical | |
| Grid Voltage 3 (Ug3) | 0 V typical | |
| Grid to Plate Capacitance (ca/g) | 1.3 pF | |
| Heater to Cathode Voltage (Uk/f) | ≤ 100 V | |
| Heater to cathode resistance (Rk/f) | 20 kΩ | |
| Internal Resistance (Ri) | 15 kΩ | |
| Item Diameter | 33.3 mm | |
| Item Height | 112 mm | |
| Plate Capacitance (ca) | 10 pF | |
| Plate Current (Ia) | 100 mA | |
| Plate Dissipation (Wa) | ≤ 25 W | |
| Plate Voltage (Ua) | ≤ 800 V, 250 V typical | |
| Transconductance (S) | 11 mA/V | |
| T-EL34II-JJ-MQ - Apex Matched Quad version | Body Height | 98 mm |
| Cathode Current (Ik) | ≤ 150 mA | |
| Filament Current (If) | 1.5 A | |
| Filament Voltage (Uf) | 6.3 V | |
| Gain (μg2/g2) | 11 | |
| Grid 2 Dissipation (wg2) | 8 W | |
| Grid Capacitance (cg1) | 15.5 pF | |
| Grid Current 2 (Ig2) | 14.9 mA | |
| Grid Voltage 1 (Ug1) | -13.5 V typical | |
| Grid Voltage 2 (Ug2) | ≤ 450 V, 265 V typical | |
| Grid Voltage 3 (Ug3) | 0 V typical | |
| Grid to Plate Capacitance (ca/g) | 1.3 pF | |
| Heater to Cathode Voltage (Uk/f) | ≤ 100 V | |
| Heater to cathode resistance (Rk/f) | 20 kΩ | |
| Internal Resistance (Ri) | 15 kΩ | |
| Item Diameter | 33.3 mm | |
| Item Height | 112 mm | |
| Plate Capacitance (ca) | 10 pF | |
| Plate Current (Ia) | 100 mA | |
| Plate Dissipation (Wa) | ≤ 25 W | |
| Plate Voltage (Ua) | ≤ 800 V, 250 V typical | |
| Transconductance (S) | 11 mA/V | |
| T-EL34II-JJ - Single version | Body Height | 98 mm |
| Cathode Current (Ik) | ≤ 150 mA | |
| Filament Current (If) | 1.5 A | |
| Filament Voltage (Uf) | 6.3 V | |
| Gain (μg2/g2) | 11 | |
| Grid 2 Dissipation (wg2) | 8 W | |
| Grid Capacitance (cg1) | 15.5 pF | |
| Grid Current 2 (Ig2) | 14.9 mA | |
| Grid Voltage 1 (Ug1) | -13.5 V typical | |
| Grid Voltage 2 (Ug2) | ≤ 450 V, 265 V typical | |
| Grid Voltage 3 (Ug3) | 0 V typical | |
| Grid to Plate Capacitance (ca/g) | 1.3 pF | |
| Heater to Cathode Voltage (Uk/f) | ≤ 100 V | |
| Heater to cathode resistance (Rk/f) | 20 kΩ | |
| Internal Resistance (Ri) | 15 kΩ | |
| Item Diameter | 33.3 mm | |
| Item Height | 112 mm | |
| Plate Capacitance (ca) | 10 pF | |
| Plate Current (Ia) | 100 mA | |
| Plate Dissipation (Wa) | ≤ 25 W | |
| Plate Voltage (Ua) | ≤ 800 V, 250 V typical | |
| Transconductance (S) | 11 mA/V |
 Specification Sheet | All Models |
My Project Lists
Specifications, Files, and Documents
Questions and Answers
Click each question to see its answers.
1 answers
I have a 30 watt marshall artist with one 12ax7 and 2 el34 tubes. How much lower would the output volume be? 30 watts is way too loud for me.
Asked by Anonymous on August 27th, 2015.
August 27th, 2015
Staff MemberTop Contributor
The JJ EL34II tube will offer earlier power tube breakup than a standard JJ EL34 but will not change the overall output of your amplifier in a significant way. Both tubes are rated at 25W so the difference would be in the plate structure which allows you to achieve a slightly tamer output with earlier breakup.
1 answers
I am looking to replace tubes in an Apache transmitter that used EL34/6CA7 tubes (2) in a modulator for Amplitude Modulation operation. The originals were made for Heathkit. The important data is not on this site to insure replacements have same operational curves and bias/plate voltage - current - dissipation. Any leads?
Asked by Anonymous on April 4th, 2017.
These are Apex matched tubes and the matching process is a bit different from the standard matching procedures. For more information please contact Apex Matching at: info@apexmatching.com.
1 answers
Any significant tonal difference?
Asked by Anonymous on April 4th, 2017.
The EL34 II has a different, narrower plate structure which produces a tight, creamy overdrive distortion at a lower overall acoustic volume level as compared to a JJ EL34.
1 answers
Are these compatible with my mark 111 boogie?
Asked by Anonymous on October 5th, 2017.
If your amp calls for EL34's then these should work. You will want to specify "middle numbers" in the notes section of the checkout process for compatibility with your Boogie.
Product Reviews
Ordered an Apex matched quad, They biased at 31, 31, 35, 36 I called and got the ok to ship back which cost me $20. I get a text back from Westley stating they were perfectly matched and that they were sending them back which cost me another $10. Not too happy with the service.