Description
Pair Valvo E81CC made by Siemens & Halske in December 1957
This is an early pair E81CC (12AT7WA) produced by Siemens & Halske in Munich. The tubes are new in original boxes. The date codes CØ2 # 7L are clearly visible and indicate December 1967 as production date. Very healthy tubes with good specs; see test results.These E81CC tubes have a double post halo getter and triple micas in order to reduce microphone to an absolute minimum. Half box plate tubes.
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.
For test methods and factory specification read the tube testing page.
| Valve 1
V109 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
11,5/ 11,2 mA
6,6/ 6,3 mA/V OK |
= NOS
= NOS |
| Valve 2
V110 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
12,0/ 11,8 mA
7,0/ 6,8 mA/V OK |
= NOS
= NOS
|
Where NOS is : Ia = 7,0 to 14,0mA, Gm= 4,5 to 6,5 mA/V. (Telefunken factory specification see test page)
Short description
| Tube type | ECC81 |
| Quantity of Tubes | One pair |
| Brand | Siemens & Halske |
| Manufactured in | Siemens & Halske, Munich, Germany |
| Dates | 1967 (CØ2 ± 7L) |
| Construction | 1-hole ribbed plate |
| Getter Construction | Doudle post halo getter |
| Print Condition | See pictures |
| Box included | Original Siemens & Halske box |
| Equivalent tubes: | ECC81, ECC801S, 12AT7 |
| General test results | NOS specs |
