TELEFUNKEN (TFK) ECC88 / 6DJ8 – MATCHED QUAD (4 PCS)
GRADE: GOLD SERIES | LABORATORY VERIFIED NOS MILITARY SPEC
Genuine Telefunken (Made in Germany)
Grey Plate Construction
Top Ring Getter
NOS Matched Quad
New in White Box
Amplitrex AT1000 Tested
Grey Plate Construction
Top Ring Getter
NOS Matched Quad
New in White Box
Amplitrex AT1000 Tested
Up for sale is a matched quad (4 pieces) of vintage Telefunken (TFK) ECC88 (6DJ8) dual triode preamplifier tubes, brand new in white boxes. Made in Germany, these premium tubes feature classic grey plate construction and top ring getters, world-renowned for their exceptional resolution, ultra-quiet noise floor, dynamic punch, and laser-precise soundstaging in high-end audio preamplifiers and DAC buffer stages.
As shown in, all four tubes have been thoroughly tested on our laboratory-grade Amplitrex AT1000 digital tester. The measured plate current (Ip) and transconductance (uMhos) results are calculated against factory specifications (15.0 mA / 12500 uMhos) and detailed in the table below.
| Serial No. / Markings | Tube Section | Plate Current (Ip) | Transconductance (uMhos) | ||||
|---|---|---|---|---|---|---|---|
| Factory Spec | Result | % Ip | Factory Spec | Result | % Gm | ||
| TELEFUNKEN ECC88 SR: 2937024 |
Triode 1 (T1) | 15.0 mA | 11.6 mA | 77% | 12500 uMhos | 12020 uMhos | 96% |
| Triode 2 (T2) | 15.0 mA | 13.2 mA | 88% | 12500 uMhos | 12360 uMhos | 99% | |
| TELEFUNKEN ECC88 SR: 2937040 |
Triode 1 (T1) | 15.0 mA | 12.4 mA | 83% | 12500 uMhos | 12000 uMhos | 96% |
| Triode 2 (T2) | 15.0 mA | 12.8 mA | 85% | 12500 uMhos | 12150 uMhos | 97% | |
| TELEFUNKEN ECC88 SR: 2937032 |
Triode 1 (T1) | 15.0 mA | 15.0 mA | 100% | 12500 uMhos | 12400 uMhos | 99% |
| Triode 2 (T2) | 15.0 mA | 15.0 mA | 100% | 12500 uMhos | 12800 uMhos | 102% | |
| TELEFUNKEN ECC88 SR: 2937031 |
Triode 1 (T1) | 15.0 mA | 15.0 mA | 100% | 12500 uMhos | 12640 uMhos | 101% |
| Triode 2 (T2) | 15.0 mA | 15.0 mA | 100% | 12500 uMhos | 12240 uMhos | 98% | |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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