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EL509S Matched Quad

Our Products: Power Tubes > EL509S

Price: $232.00

Sold Out! New stock will be available June 2022.

EL509S Matched Quad

Product Details

JJ EL509S Matched Quad. The JJ EL509S is a modern octal based "non plate cap" version of the classic EL509. This is a powerhouse of a tube with a 42 watt Screen+Plate rating and 500mA peak cathode current capability. This makes it ideal for "Output-Transformerless" designs but can also be used in traditional Single Ended or Push/Pull topologies.

Please contact us if you have special matching or grade requirements.

After a 24 hour burn in all power tubes are tested for noise and matched at multiple operating points for plate current (+/- one milliamp) and transconductance.

The JJ EL509S is a modern production version of the classic EL509 but with no top plate cap. Instead the plate connection is brought down to pin #3. Because of this tubes high cathode current capability they're ideal in OTL applications or anywhere large peak current swings desired.

We've seen/heard amazing results with these tubes in the classic Futterman circuit/topology. If you're into Electrostatic or planar style transducers this is perhaps the ultimate pairing.

Please leave us a note in the comments section as to what amp they're going into and or if you're looking for specific matching and grading criteria.

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