Beschrijving
Pair Telefunken ECC81 made by Siemens & Halske in Germany
This is a pair Telefunken pair ECC81 produced by Siemens & Halske in Munich, Germany. The tubes are assumed to be unused. The tubes are half box plate with two holes and a halo getter, The date codes VF3 # 0K & VF3 # 1C are clearly visible and indicate November 1970 and March 1971 as production dates. Very healthy tubes with good specs; see test results.
Sonics
The tube type is highly regarded; I refer to the few threads on the web for more information. Excellent valve for the preamp section; low noise, very smooth extended highs. Balanced and smooth sounding, recommended!
Test results
Both tubes test NOS. The internal balance between the triode sections is excellent and the tubes are matched nicely; see test results
For test methods and factory specification read the tube testing page.
| Valve 1
V21 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
10,4/ 9,6 mA
5,3/ 5,5 mA/V OK |
= NOS
= NOS |
| Valve 2
V97 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
10,0/ 9,4 mA
5,3/ 5,2 mA/V OK |
= NOS
= NOS
|
Short description
| Tube type | ECC81 |
| Quantity of Tubes | One pair |
| Brand | Telefunken |
| Manufactured in | Siemens & Halske, Munich, Germany |
| Dates | 1970 / 1971 |
| Construction | 2-hole ribbed plate |
| Getter Construction | Halo getter |
| Print Condition | Excellent; see pictures |
| Box included | Generic Telefunken factory box |
| Equivalent tubes: | ECC81, ECC801S, 12AT7 |
| General test results | NOS specs |
