Description
Pair Siemens & Halske ECC801S made in Munich by Siemens & Halske in 1967 & 1968
This is a pair ECC801S tubes produced by Siemens & Halske in Munich. On tubes date codes: CØ6 # 7C & CØ6 # 8E are visible; they indicate 1967 and 1968 as production dates. Very healthy tubes with good specs; see test results.These ECC801S tubes have a copper grid and halo posts and a half box plate with one square hole. This is the longlife, tight tolerance version of the ECC81/12AT7. This tube was made exclusively for governmental institutions and manufacturers of high precision gear. One of the tubes is an army selection.
Sonic
This 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, tight bass. Balanced and smooth sounding, recommended!
Test results
Both tubes test NOS. The internal balance between the triode sections is excellent. The tubes are matched. The measurement data below illustrate that the tubes are in good condition.
| Valve
V72 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
11,6 / 11,9 mA
6,0 /6,0 mA/V OK |
= NOS / NOS
= NOS / NOS
|
| Valve
V73 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
11,5 /11,7 mA
5,8 /5,8 mA/V OK |
= NOS / NOS
= NOS / NOS
|
Where NOS is : Ia = 7,0 to 14,0mA, Gm= 4,5 to 6,5 mA/V.
For test methods and factory specification read the tube testing page.
Short description
| Tube type | ECC81 |
| Quantity of Tubes | One pair |
| Brand | Siemens & Halske |
| Manufactured in | Siemens & Halske, Munich, Germany |
| Dates | 1967 &1968 (CØ6 ± 7C & CØ6 ± 8E ) |
| Construction | 1-hole ribbed half box plate |
| Getter Construction | Copper grid and halo posts |
| Print Condition | See pictures |
| Box included | Generic whites box |
| Equivalent tubes: | ECC81, ECC801S, 12AT7 |
| General test results | NOS specs |
