Wiadomość #200811

[harry_manback]

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Hi Marcin,
It is possible to swap the ECC83 with ECC81. The ECC81 comes with an higher gradient and so it is possible that the tube is more microphonic than the ECC83.

Normally the tube should work correctly and you can use it without any problems.

 

ECC81 (Ua = +250[V], Ug = -2.0[V], Ia = 10.0[mA], Philips datasheet):

-gradient: 5.5[mA/V].
-µ=1/control ratio: 60.
- internal resistance: 11.0[kOhm].

ECC82 (Ua = +250[V], Ug = -8.5[V], Ia = 10.5[mA], Philips datasheet):

- gradient: 2.2[mA/V].
- µ = 1/ control ratio: 17.
- internal resistance: 7.7[kOhm].

ECC83 (Ua = +250[V], Ug = -2.0[V], Ia = 1.2[mA], Philips datasheet):

- gradient: 1.6[mA/V].
- µ = 1/control ratio: 100.
- internal resistance: 62.5[kOhm].

Kind regards
Martin Zimmermann