Beschrijving
ECC83 Valvo tilted halo getter, long plates, mC2, 1958/1959, Hamburg Germany.
Description
These ECC83 tubes are produced in the Valvo factories in Hamburg Germany. The tubes are produced in December 1958 and May 1959. The tubes have a tilted Halo getter and long ribbed grey plates, see pictures. The tubes are in good condition! Very healthy tubs with good specs! And with matching systems; see test results.
Sonics
The long plate Hamburgl ECC83 tubes are considered as the best of the best; “they bring the concerthal to your room”; deliver an open holographic sound stage with transparency and detail. I refer to the many threads on the web for more information. Excellent preamp valve, low noise, very smooth extended highs, very good in phono stages. Balanced and smooth sounding with liquid midrange, recommended!
Note from the web: The pre sixties long plates from Valvo Hamburg ECC83 is highly regarded by serious classical listeners looking to improve sound quality. Very transparent and open sound with impressive speed and phenomenal high end extension, accurate bass as intended by the original recording. Overall neutral to warm sounding. The top end is silky and pleasant and doesn’t get rolled off. And a fine sense of “air” at the top. This mC-version is slightly warmer and fuller than the clear/neutral Heerlen Holland versions; more like the Siemens & Halske Germany ECC83 mC-version.
Test method & results
The tubes have been tested carefully with the original Telefunken test set-up and our sophisticated test equipment. Please read our test method for the ECC83 tube family. The measurement data below show that the tubes are matched and internally balanced. They fulfill the factory specs of a new/NOS tube.
| Valve 1
V103 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
1,2 / 1,2 mA
1,6 /1,6 mA/V OK |
= NOS / NOS
= NOS / NOS
|
| Valve 1
V102 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
1,3 / 1,3 mA
1,8 /1,8 mA/V OK |
= NOS / NOS
= NOS / NOS
|
Where NOS is : Ia = 1,1 to 1,4mA, Gm= 1,3 to 1,95 mA/V.
* For test methods and factory specification read the tube testing page.
Short description
| Tube type | ECC83 |
| Quantity of Tubes | One Pair |
| Brand | Valvo |
| Manufactured by | Valvo in Hamburg Germany |
| Dates | 1959 (mC2 D 9E) & 1958 (mC2 D 9K) |
| Construction | Long ribbed plates, copper grid posts |
| Getter Construction | Tilted halo getter |
| Print Condition | None; See pictures |
| Box included | Generic Valvo box |
| Equivalent tubes: | 12AX7, ECC803S, CV4004, 12AX7A, B339, 12AX7WA |
| General test results | NOS |
