2 x NOS Mazda BELVU 12AX7 ECC83 Test STRONG MATCHED BALANCED Nickel Vacuum Tubes
2개의 NOS 마쓰다 벨뷰 12AX7 ECC83 테스트 스트롱 매치 밸런스 니켈 진공관
| 상품번호 | 406522003978 |
| 거래유형 | 즉시구매 |
| 출고국 | 영국 (GB) |
상품 설명
Mazda Belvu 12AX7 / ECC83 - Exceptionally Rare MIL Matched Pair
One of the rarer ECC83 variants you will encounter - a NOS matched pair of MIL-marked Mazda Belvu double triodes, the French/Belgian military-grade tube built by MBLE for low microphony and rugged consistency. Black shiny plates, inclined square getter. Tested matched and closely balanced across both sections. Price per pair.
Key Features
- Brand: Mazda Belvu (Licence RCA) - MBLE production, MIL marked (military grade)
- Tube Type: 12AX7 / ECC83 - High-Gain Double Triode, Audio Frequency
- Condition: NOS, never used, with packaging
- Construction: Black shiny plates, inclined square getter
- Etched Codes: 3F5 / 573 / XII-6
- Matching: Tested matched and closely balanced (seller confirmed)
- Base: Noval B9A (9-pin miniature)
- Filament: 12.6V / 0.15A (or 6.3V / 0.3A tapped)
- Quantity: 2 tubes (matched pair)
Test Results
Uh = 12.6V | Ua = 250V | Ug1 = -2.0V
| Section | Ia (mA) | S (mA/V) | Nominal (100%) |
|---|---|---|---|
| Tube 1 - T1 | 1.3 | 2.1 | Ia = 1.2 / S = 1.6 |
| Tube 1 - T2 | 1.3 | 2.0 | |
| Tube 2 - T1 | 1.2 | 1.9 | |
| Tube 2 - T2 | 1.3 | 2.0 |
Equivalents
ECC83 = 12AX7 = B339 = 95-127-01 = 6L13 = CM1 = ECC83S
Normally replaceable, slightly different: 0AX7 ~ 12AX7A ~ CV492 ~ E2164
Other class quality (otherwise equal): 7025 ~ CV4004 ~ E83CC ~ M8137
Predecessor: 12AX7; Successors: ECC808 ~ 5751WA
About the Mazda Belvu 12AX7 / ECC83
The ECC83 (12AX7) is the definitive high-gain audio double triode, introduced in 1954 and used across thousands of amplifiers and preamps. Mazda Belvu, produced by MBLE, built its miniature dual-triodes to demanding French and Belgian military and industrial specifications, competing directly with Philips/Mullard and Telefunken. This pair carries the MIL marking that denotes military-grade selection, with black shiny plates and an inclined square getter - a construction favoured for low microphony and rugged consistency. Mazda Belvu tubes are highly regarded among European tube connoisseurs for their warm, dynamic tone, and a genuine NOS matched pair is increasingly hard to find.
Shipping Information
A matched, MIL-grade Mazda Belvu pair in NOS condition rarely surfaces - black plates, inclined square getter, closely balanced. Claim it now.
SKU: 70