Description
Unique opportunity: these boxes have never been opened ?
You buy them “as is”
For these tubes/boxes there is no return possible!
Description
This is a pair ECC81 produced by Telefunken in Berlin Germany. There date code is: 4003324E. The boxes have not been opened; so it is unknown which version is in the boxes. The foil of one box has some licht damage; but the boxes never have been opened (see pictures).
Sonics
Unknown.
Test results*
Because the boxes in which the tubes are, are sealed, the tubes are not measured. Because of the same fact, they are NOS by definition.
| Valve 1
V78 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
-/ mA
-/ – mA/V OK |
= NOS
= NOS |
| Valve 2
V86 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
-/ – mA
-/ – 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 | Telefunken |
| Manufactured in | , Germany |
| Dates | 4003324E (1963) |
| Construction | – |
| Getter Construction | – |
| Print Condition | – |
| Box included | Original sealed box |
| Equivalent tubes: | 12AT7, ECC801S, 12AT7A, E81CC |
| General test results | NOS |
