🌟 Premium Tungsram EL84 / 6BQ5 NOS Matched Quad Set 🌟
Top Ring Getter
Quad Set
Tested on Amplitrex AT1000
Made in Hungary
Quad Set
Tested on Amplitrex AT1000
Made in Hungary
A highly sought-after **NOS (New Old Stock)** Matched Quad of **Tungsram EL84** power tubes. Tungsram tubes are celebrated for their balanced, rich tone and reliability, often competing with Mullard and Telefunken. This quad set is perfect for high-fidelity audio amplifiers (e.g., Fisher, Scott) or classic guitar amps (e.g., Marshall, Vox) requiring four tightly matched output tubes.
- Type: EL84 / 6BQ5
- Brand: Tungsram
- Condition: NOS – New in Original Boxes
- Construction: Power Pentode
- Matching: Ip (Plate Current) & Gm (Transconductance)
- Testing: Amplitrex AT1000
**Platinum Matching:** Tightly matched across Ip and Gm for precise bias and optimal symmetry in push-pull stereo or mono-block amplifiers.
⚠️ Custom duties and taxes are the responsibility of the buyer in their country.
**Matched Quad Test Data (Amplitrex AT1000)**
| Tube ID | Serial No. | Plate Current (Ip) | Transconductance (Gm) | ||
|---|---|---|---|---|---|
| Result (mAdc) | % of NOS Spec | Result (uMhos) | % of NOS Spec | ||
| Tube 1 | 3033002 | 59.8 | 115% | 12800 | 108% |
| Tube 2 | 3033004 | 53.2 | 102% | 12200 | 103% |
| Tube 3 | 3033001 | 51.4 | 99% | 12100 | 102% |
| Tube 4 | 3033005 | 45.0 | 86% | 11620 | 98% |
✉️ For custom matching services or any questions, please **Email us** at
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