Vacuum Tube - EL509, JJ Electronics
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Starting at: $42.95
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The JJ Electronic EL509S is an eight pin octal based version of the EL509 / EL519. This modified version does not have the top plate cap which is instead wired to a pin on the octal base. This tube is rated for 700V and 42 Watts plate dissipation. The JJ EL509 is popularly used in output transformerless OTL amplifiers.
Matched versions of this tube use Apex Matching
RoHS Compliant
Accessory Items:
| Single or Matched | Our Part Number | UPC/EAN | JJ Electronics Part Number |
|---|---|---|---|
| Apex Matched Pair | T-EL509-S-JJ-MP | 609722123082 | |
| Single | T-EL509-S-JJ | 609722123075 | EL509S |
| Body Height | 105 mm | |
| Cathode Current (Ik) | ≤ 500 mA | |
| Filament Current (If) | 2 A | |
| Filament Voltage (Uf) | 6.2 V | |
| Grid 2 dissipation (Wg2) | ≤ 40 W | |
| Grid Current 2 (Ig2) | 10 mA | |
| Grid Voltage 1 (Ug1) | -30 V typical | |
| Grid Voltage 2 (Ug2) | ≤ 700 V, 160 V typical | |
| Grid to Plate Capacitance (ca/g) | 3 pF | |
| Heater to cathode voltage (Uk/f) | ≤ 150 V | |
| Item Diameter | 38 mm | |
| Item Height | 116 mm | |
| Plate Current (Ia) | 200 mA | |
| Plate Voltage (Ua) | ≤ 700 V, 160 V typical | |
| Saturation voltage (Usat) | 30 VAC |
| Packaging Dimensions | Apex Matched Pair version | T-EL509-S-JJ-MP | 5.6 in. × 3.3 in. × 1.6 in. |
| Single version | T-EL509-S-JJ | 1.6 in. × 1.6 in. × 5.8 in. | |
| Weight (Packaging) | Apex Matched Pair version | T-EL509-S-JJ-MP | 0.346 lbs. |
| Single version | T-EL509-S-JJ | 0.173 lbs. |
| T-EL509-S-JJ-MP - Apex Matched Pair version | Body Height | 105 mm |
| Cathode Current (Ik) | ≤ 500 mA | |
| Filament Current (If) | 2 A | |
| Filament Voltage (Uf) | 6.2 V | |
| Grid 2 dissipation (Wg2) | ≤ 40 W | |
| Grid Current 2 (Ig2) | 10 mA | |
| Grid Voltage 1 (Ug1) | -30 V typical | |
| Grid Voltage 2 (Ug2) | ≤ 700 V, 160 V typical | |
| Grid to Plate Capacitance (ca/g) | 3 pF | |
| Heater to cathode voltage (Uk/f) | ≤ 150 V | |
| Item Diameter | 38 mm | |
| Item Height | 116 mm | |
| Plate Current (Ia) | 200 mA | |
| Plate Voltage (Ua) | ≤ 700 V, 160 V typical | |
| Saturation voltage (Usat) | 30 VAC | |
| T-EL509-S-JJ - Single version | Body Height | 105 mm |
| Cathode Current (Ik) | ≤ 500 mA | |
| Filament Current (If) | 2 A | |
| Filament Voltage (Uf) | 6.2 V | |
| Grid 2 dissipation (Wg2) | ≤ 40 W | |
| Grid Current 2 (Ig2) | 10 mA | |
| Grid Voltage 1 (Ug1) | -30 V typical | |
| Grid Voltage 2 (Ug2) | ≤ 700 V, 160 V typical | |
| Grid to Plate Capacitance (ca/g) | 3 pF | |
| Heater to cathode voltage (Uk/f) | ≤ 150 V | |
| Item Diameter | 38 mm | |
| Item Height | 116 mm | |
| Plate Current (Ia) | 200 mA | |
| Plate Voltage (Ua) | ≤ 700 V, 160 V typical | |
| Saturation voltage (Usat) | 30 VAC |
 Specification Sheet | All Models |
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Questions and Answers
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1 answers
Can I replace my JJ EL 509 with the new 509S in my Trancendent OTL amp ?
Asked by Anonymous on January 24th, 2021.
January 26th, 2021
Staff Member
The "S" indicates the spiral filament and is simply a production specification. This should be an acceptable replacement for your original tube.
Product Reviews
Use these tubes in my The Beast Jr from Transcendent. they work great got the APEX matched, adjusting bias was a breeze and stayed stable after that.
Had an issue with a set, send the tubes back,they were verified and got fast a new set send back to me excellent service. There for i buy all my tubes here.
My Transcendent Mini Beast amplifier uses 6 of these power tubes. It's OTL design does not require bias adjustment and tube matching, so when one of the six power tubes failed after a year, I purchased a single to replace it. So far so good. Hopefully it will last longer than the one it replaced. Antique Electronic Supply packed the tube for shipment perfectly. My order was processed and shipped same day. The tube is priced competitively. It's good to have my tunes back!