Description
This quad Siemens E88CC premium ECC88 tubes is precisely Matched.
These premium ECC88 tubes have a bright shield and halo-getter. This very reliable, long life and low noise version of an ECC88 tube which is mostly used for military, professional or communication purposes. The properties of the Siemens E88CC for hifi applications are legendary and widely known. I refer to the many threads on the web for more information.
The tubes are thoroughly tested. The quad is matched very well and all four tubes are internally balanced. The specs of the quad match the factory specifications very well and fulfil the factory specs of a new tube. See test results.
Sonics
These tubes are usually characterized by an impressive open “air” at the top end. The soundstage is large. The midrange is ruler flat, and the bass is tight and accurate. These tubes have a fine sense of dynamics, and most are impressively quiet. These are not “warm” tubes, and to some ears their lack of midrange warmth may be heard as bright. I tend to think of them as accurate, and their clean, focused sonic image is astonishing. They are absolutely incredible tubes that will never be made again!
- Mids: very natural and fluid. Voices and acoustic instruments often sound very believable.
- High: clean and refined, rather silky than emphatically sparkling. No excessive sharpness.
- Layer: tight and controlled, with good definition but usually not the most massive or spectacular layer.
- Spatiality: a beautiful, stable stereo image with good depth; rather realistic than artificially large.
- Detail: a lot of microdetail without it becoming analytical or exhausting.
- Dynamics: quite direct and lively, but with a certain relaxation.
Summarizing: “transparent with a touch of tube romance, but without an exaggerated colored sound.”
Test & test results
The tubes have been tested carefully with the official factory test set-up and our sophisticated test equipment. Please read our testmethod for the ECC88 tube family. The measurement data below show that these tubes are matched to each other and are internally balanced. And meet the factory specifications of a new/NOS tube.
| Valve 1
V139 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
14,9/14,5 mA
11,2 /10,7 mA/V OK |
= NOS / NOS
= NOS / NOS
|
| Valve 2
V136 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
15,0/14,4 mA
11,2 /11,9 mA/V OK |
= NOS / NOS
= NOS / NOS
|
| Valve 3
V140 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
14,6/14,4 mA
10,6 /11,2 mA/V OK |
= NOS / NOS
= NOS / NOS
|
| Valve 4
V405 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
14,9/14,6 mA
13,1 /12,2 mA/V OK |
= NOS / NOS
= NOS / NOS
|
Test methods and reference values are outline on the Tube testing page.
Summarized description
| Tube type | E88CC |
| Quantity of Tubes | One quad |
| Brand | Siemens |
| Manufactured in | Müchen, Germany |
| Date codes | A6 # 7C, A6 # 7K, A6 # 0G, A6 # 0* |
| Construction | Frame grid with gold pins |
| Getter Construction | Halo getter |
| Print Condition | Excellent; see pictures |
| Box included | Original box |
| Equivalent tubes: | ECC88, CCa, 6922 |
| General test results | NOS |
Please read our test and shipping policy before buying !
