Description
Long life SQ ECC81 tubes !
This is a pair 6201 Philips Miniwatt tubes. They are produced by the Philips subsidiary Valvo in the 1961 in the Hamburg factories. The tubes have a halo getter, a half box plate structure, and gold pins, see pictures. Healthy tubes with NOS specs! Tubes with matching triode systems; see test results. The tubes are used.
Sonics
Overall, the 6201 tube is a step up from the standard 12AT7; they were made to meet military specs.
Open and smooth sounding with a clear midrange, highly recommended!
Test results*
| Valve 1
V151 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
11,2/ 10,8 mA
6,3/ 6,4 mA/V OK |
= NOS
= NOS |
| Valve 2
V153 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
10,8/ 10,6 mA
6,2/ 6,1 mA/V OK |
= NOS
= NOS
|
Where NOS is : Ia = 7 to 14 mA, Gm= 4,5 to 6,5 mA/V.
* For test methods and factory specification read the tube testing page.
Short description
| Tube type | 6201 |
| Quantity of Tubes | One pair |
| Brand | Philips Miniwatt |
| Manufactured in | Valvo factory, Berlin Germany |
| Etch code | Both tubes Df6 D 2D1 (1961) |
| Construction | Frame grid, gold pins |
| Getter Construction | Halo |
| Print Condition | See pictures |
| Box included | White box |
| Equivalent tubes: | 12AT7, ECC81, 12AT7WA, ECC801S |
| General test results | NOS |
