EL34JJ Pair Red Label Röhre Röhren BTB matched Paar
€38.20
Delivery time: ca. 1 - 5 days
e.g. Octave V40 SE, Audio Research VS55.
e.g. Marshall JCM800 2204, 1987X 50W.
Octal | 6.3V / 1.5A | 25W max dissipation
JJ EL34 Red Label matched pair – two selected power pentodes for push-pull stages
Two output tubes, one push-pull stage – this is where matching decides the result. This JJ EL34 pair is selected under BTB's Red Label premium matching program for tight idle current, so both branches of the output stage share the load evenly. That makes it the right set for 50-watt guitar classics such as the Marshall JCM800 2204 or a 1987X, and equally for push-pull hi-fi amplifiers fitted with a pair, such as the Octave V40 SE or Audio Research VS55.
Tonally the JJ EL34 sits on the pleasantly warm, slightly soft side: smooth and earthy at the bottom, colorful through the mids in hi-fi, and with a touch-responsive, musical compression in a guitar amp. Give a fresh pair around 50 to 100 hours of burn-in until the sound has fully settled – with this EU-made tube's price-to-performance ratio, patience pays off.
Typical applications
- Retubing 50-watt guitar amplifiers running two EL34s in the output stage
- Push-pull hi-fi amplifiers and monoblocks fitted with one pair
- Replacing aged, drifted output tubes with one freshly matched set
- Audio DIY push-pull builds around EL34, 6CA7 or KT77-compatible circuits
Technical data
- Valve type
- power pentode for audio output stages
- Base
- octal K8A (8-pin)
- Heater
- 6.3 V / 1.5 A per tube
- Absolute limits (not operating points)
- max. plate dissipation 25 W per system, max. screen grid dissipation 8 W, max. plate voltage 800 V
- Transconductance
- typically 11 mA/V per data sheet
- Selection
- BTB premium matching as a pair with tight idle current
- Burn-in period
- approx. 50 to 100 hours until the sound has settled
- Dimensions
- height approx. 101 mm excluding pins, bulb and base diameter approx. 32 mm
- Scope of delivery
- 2 valves as a matched pair
- Country of manufacture
- JJ Electronic, Slovakia (EU)
Application and design notes
With fixed-bias amplifiers, a bias check belongs to every tube change so both tubes run at the intended operating point; cathode-biased circuits self-adjust but benefit from tight matching just the same. Distortion behavior and tone additionally depend on the operating point, output transformer and feedback design. Lethal voltages are present inside the chassis – service work requires proper qualification.
Questions about selection and use
Does the JJ EL34 pair fit my 50-watt guitar amp?
Yes, 50-watt classics such as the Marshall JCM800 2204 or a 1987X run two EL34s in the power stage – this matched pair is the complete replacement set. Have the bias set by a technician after installation and the warm, dynamic core tone is ready to go.
Why buy a matched pair instead of two single EL34s?
Yes, matching is what makes the difference here: two tubes with tight idle current share the load evenly in push-pull, driving the output transformer symmetrically and supporting stable, balanced operation. Two randomly picked singles can differ considerably.
Can I use the JJ EL34 in place of 6CA7 or KT77 tubes?
Yes, the 6CA7 is the American designation for the EL34, and the KT77 is regarded as a plug-compatible alternative with the same pinout and heater – in amplifiers designed for these types, the EL34 is the classic fitting. Check or have the bias adjusted after every change.
Note: All brand names mentioned, such as Marshall, Fender, etc., are registered trademarks of their respective owners and are used here for descriptive and compatibility purposes only.
JJ-Electronic s.r.o.
SK-02201 Cadca
Email: info@jj-electronic.com
The EU Directive on the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment (2011/65/EU = "RoHS 2") aims to exclude certain hazardous substances from electrical and electronic equipment or to restrict the use of certain substances in electrical and electronic equipment. These include substances such as lead, mercury, cadmium, and chromium, as well as certain brominated flame retardants and plasticizers. These substances may only be used in electrical and electronic equipment up to a maximum concentration limit, unless exemptions in the annexes to the directive permit their use under certain conditions. This can reduce and eliminate harmful substances and improve the recycling of waste electrical and electronic equipment. To find out whether the component you purchased from us is permitted in your device, please refer to the current directive or the current law applicable to your country. If you are a manufacturer, please feel free to contact us to find out whether the component you require can be tested and approved according to the current directives. We would be happy to assist you.
Fact sheet on EU Directive 2011/65/EURestriction of the use of hazardous substances in electrical and electronic equipment (PDF, not accessible, 2 MB)
Source: IHK Mittelfranken
Tariff Number: 85408100
Country of Origin: SK
further pairings
JJ EL34 octet, 8 power pentodes, octal K8A, 6.3V / 1.5A heaterMatched set of eight with equal clipping and maximum channel stabilityFor dual-mono power amps and monoblock pairs built from a single batchWarm, smooth JJ tone, 800V / 25W / g2 8W max, burn-in 50-100 hours
Delivery time: ca. 1 - 5 days
JJ EL34 quad, power pentode, octal K8A base, 6.3V / 1.5A heaterBTB premium matched quad for equal idle current in push-pull stagesWarm, smooth, earthy tone for hi-fi PP amps and 100W guitar headsGm 11mA/V typ., Ua 800V max, g2 8W max, burn-in 50-100h, made in EU
Delivery time: ca. 1 - 5 days
JJ EL34 Red Label, power pentode, octal K8A, 6.3V / 1.5A heaterBudget-friendly starter EL34 and spare from current EU productionSingle tube for SE amps, experiments and OEM own in-house selectionWarm, soft and colorful in hi-fi, bluesy and earthy in guitar amps
Delivery time: ca. 1 - 5 days
JJ EL34 sextet, 6 power pentodes, octal K8A, 6.3V / 1.5A heaterMatched six pack with equal clipping and headroom across the whole setFor 200-watt bass and guitar amplifiers and large PPP output stagesWarm, earthy voicing, 800V / 25W / g2 8W max, burn-in 50-100 hours
Delivery time: ca. 1 - 5 days