Ray Tubes RESERVE EL34

Ray Tubes RESERVE EL34 – The British Output Pentode at Its Finest

The EL34: A British Classic Reimagined

The Ray Tubes RESERVE EL34 is a power pentode with an 8-pin socket, introduced by Mullard in 1955 and since established as one of the most versatile and musical output tubes in high-fidelity audio. With an amplification factor of 11 and a transconductance of 11 mA/V, it is well suited to both Class A and Class AB output stages. Furthermore, it delivers more than 10 W in Class A and more than 35 W in Class AB — consequently performing with authority in amplifiers of widely varying power and topology. The RESERVE EL34 honours this heritage through monocrystalline carbon coating and a selection process of exceptional rigour.

Magic Coating: Monocrystalline Carbon

The outer glass of the RESERVE EL34 carries the Magic Coating: a layer of monocrystalline carbon that accelerates electron transmission, keeps the glass cooler, and blocks external noise. Consequently, the RESERVE EL34 achieves a lower noise floor than standard new production tubes can offer. The coating is difficult to apply and is therefore used exclusively in the RESERVE tier. Above all, it is the technical foundation behind this tube's distinctive sonic character.

Selection and Quality Control

Fewer than 5% of each production batch meet the standards of the RESERVE Collection. Every tube is individually tested for gain, transconductance, internal resistance, noise, and microphonics. Moreover, an audio engineer personally evaluates each tube under real-world listening conditions before release. Therefore, the RESERVE EL34 offers a consistency that even the finest NOS tubes rarely achieve. For tube rolling in an EL34 amplifier, this means a predictable and lasting upgrade. Each tube ships with a certificate of authenticity and a user handbook containing burn-in guidelines.

Sound Character

The RESERVE EL34 presents a powerful, warm, and musical sound throughout the frequency range. Bass is full and taut, with natural weight and excellent texture. The midrange is balanced and clear, rendering vocals and acoustic instruments with convincing presence and realism. Treble is open and detailed, free of harshness or listening fatigue. Furthermore, the soundstage is wide and dynamic, with a spacious sense of scale and strong stereo separation. Above all, the RESERVE EL34 excels with large-scale, complex compositions where dynamic range and resolution are paramount.

Specifications

• Tube type: EL34
• Socket: 8-pin
• Amplification factor: 11
• Transconductance: 11 mA/V
• Max anode voltage: 800 V
• Max screen voltage: 500 V
• Max anode dissipation: 25 W
• Max screen dissipation: 8 W
• Output power Class A (single tube): >10 W
• Output power Class AB: >35 W
• Max grid voltage: ~12.2 V
• Heater voltage: 6.3 V
• Heater current: 1.5 A
• Coating: monocrystalline carbon (Magic Coating)
• Pins: gold-plated
• Warranty: 12 months against manufacturing defects
• Available as: single tube, matched pair, or set of four

Frequently asked questions

Is the RESERVE EL34 compatible with all EL34 amplifiers?

Yes. The RESERVE EL34 is electrically compatible with all amplifiers specifying a standard EL34. In fixed bias amplifiers, bias adjustment is always recommended after a tube change. In self-bias or autobias circuits, the amplifier adjusts automatically.

How long does the RESERVE EL34 take to burn in?

Ray Tubes recommends a minimum of 6 hours of burn-in. User experience suggests the tube reaches its full sonic potential after approximately 50 hours of use. A definitive assessment is best made after that point, as the character can change noticeably during the early hours.

When is a set of four needed rather than a matched pair?

A matched pair is sufficient for amplifiers using one EL34 per channel. A set of four is required for push-pull output stages using two EL34 tubes per channel — which applies to most EL34 amplifiers. Ray Tubes matches all tubes on anode current for maximum balance and consistency.