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Old 6th December 2012, 04:02 PM   #11
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Osvaldo de Banfield's Avatar
 
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Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
I recently found this topic using Google and it is pretty interesting. Do anybody if it can work also with pentodes?

Many thanks in advance.
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Old 29th January 2013, 03:10 PM   #12
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Other question/problem I have with regards to the tube models is that the ones I have come across do not have a equivalent Noise resistance at the input for simulating S/N ration in the circuits I work on (RIAA).
Does anyone know how I can add a Equivalent Noise Resistance of 350 ohm (Worst Case) to the spice model of the 6N23P below?

Many thanks in advance

.SUBCKT 6N23P 1 2 3 ; P G K ; P G C (Triode) 26-Oct-2001
+ PARAMS: MU=33.04 EX=1.220 KG1=212.4 KP=183.83
+ KVB=300.0 VCT=0.00 RGI=2000
+ CCG=3.6P CGP=1.5P CCP=2P
E1 7 0 VALUE=
+{V(1,3)/KP*LOG(1+EXP(KP*(1/MU+(V(2,3)+VCT)/SQRT(KVB+V(1,3)*V(1,3)))))}
RE1 7 0 1G
G1 1 3 VALUE={(PWR(V(7),EX)+PWRS(V(7),EX))/KG1}
RCP 1 3 1G ; TO AVOID FLOATING NODES IN MU-FOLLOWER
C1 2 3 {CCG} ; CATHODE-GRID;
C2 2 1 {CGP} ; GRID-PLATE;
C3 1 3 {CCP} ; CATHODE-PLATE;
D3 5 3 DX ; FOR GRID CURRENT
R1 2 5 {RGI} ; FOR GRID CURRENT
.MODEL DX D(IS=1N RS=1 CJO=10PF TT=1N)
.ENDS
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Old 8th March 2013, 03:29 AM   #13
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If you already know the ENR, then you can calculate the noise figure based on the stage's configuration, it does not need to be "inside" the tube model, the methodology is outlined in Burkhard Vogel's "The Sound of Silence".

Jaz
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Old 8th March 2013, 07:53 PM   #14
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Thanks Jaz

Yes you are right found the chapter in the book you refered to... thanks for the hint!!!

Cheers Tonny
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