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Vacuum Tube SPICE Models
Vacuum Tube SPICE Models
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Old 6th January 2014, 07:55 AM   #201
ruffrecords is offline ruffrecords  United Kingdom
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Quote:
Originally Posted by kevinkr View Post
Hey Ian,
I generally run the 6S3P at between 7 - 12mA with good results.
Why so high?

Cheers

Ian
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Old 6th January 2014, 04:20 PM   #202
kevinkr is offline kevinkr  United States
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Vacuum Tube SPICE Models
Linearity and noise performance mainly. It's designed to operate at relatively high currents (recommended up to 15mA) and linearity is not great at low currents. I also want to run them in the high transconductance region of their characteristic curves, I use them in low noise phono stages..
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Old 6th January 2014, 04:46 PM   #203
ruffrecords is offline ruffrecords  United Kingdom
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Quote:
Originally Posted by kevinkr View Post
Linearity and noise performance mainly. It's designed to operate at relatively high currents (recommended up to 15mA) and linearity is not great at low currents. I also want to run them in the high transconductance region of their characteristic curves, I use them in low noise phono stages..
Interesting. What plate/cathode voltage are you using.

For my application linearity is not a big issue since the signal level is small and there is global NFB. My plan is to run it at 100V Vak, -1.6 Vgc and Ia of 1mA which still gives a gm of 20mA/V.

Cheers

Ian
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Old 6th January 2014, 05:00 PM   #204
kevinkr is offline kevinkr  United States
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Depends on the application, but Vak varies from 100V to 150V and Vgc of -0.7V to -1.6V.
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Old 6th January 2014, 06:10 PM   #205
Old Tele man is offline Old Tele man  United States
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Curious, but from which Russian data-book/sheet did those 6S3P curves come from?
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Old 7th January 2014, 12:56 AM   #206
Alain Poitras is offline Alain Poitras  Canada
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Does anybody have a spice model for a 6CZ5 or a 6973 beam power tube ?

Thank you and best wishes to all for 2014 !
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Old 7th January 2014, 01:24 AM   #207
cogsncogs is offline cogsncogs  United States
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Code:
.SUBCKT 6973  1 2 3 4 ; A G2 G1 C (Pentode)
* RCA data sheet
* library format: LTSpice 14-Nov-2009
+PARAMS: MU=13.58 EX=1.350 KG1=1142.2 KG2=4500 KP=27.70 KVB=18.4 VCT=0.00 RGI=2000 CCG=4.3p CPG1=0.6p CCP=5.1p
RE1  7 0  1MEG    ; DUMMY SO NODE 7 HAS 2 CONNECTIONS
E1   7 0  VALUE={V(2,4)/KP*LOG(1+EXP((1/MU+V(3,4)/V(2,4))*KP))} ; E1 BREAKS UP LONG EQUATION FOR G1.
G1   1 4  VALUE={(PWR(V(7),EX)+PWRS(V(7),EX))/KG1*ATAN(V(1,4)/KVB)}
G2   2 4  VALUE={(EXP(EX*(LOG((V(2,4)/MU)+V(3,4)))))/KG2}
*G2   2 4  VALUE={PWR(if( V(2,4)/MU+V(3,4) < 0 , V(2,4)/MU+V(3,4), 0 ) ,EX )/KG2}
*G2   2 4  VALUE={(PWR(V(7),EX)+PWRS(V(7),EX))/KG2*(2.5708-ATAN(V(1,3)/KVB))}
RCP  1 4  1G      ; FOR CONVERGENCE    A  - C
C1   3 4  {CCG}   ; CATHODE-GRID 1    C  - G1
C2   1 3  {CPG1}  ; GRID 1-PLATE    G1 - A
C3   1 4  {CCP}   ; CATHODE-PLATE    A  - C
R1   3 5  {RGI}   ; FOR GRID CURRENT    G1 - 5
D3   5 4  DX      ; FOR GRID CURRENT    5  - C
.MODEL DX D(IS=1N RS=1 CJO=10PF TT=1N) ;
.ENDS
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Old 7th January 2014, 01:28 AM   #208
kevinkr is offline kevinkr  United States
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Quote:
Originally Posted by Old Tele man View Post
Curious, but from which Russian data-book/sheet did those 6S3P curves come from?
I have several, but the one I referred to specifically in this case is available here:

http://www.mif.pg.gda.pl/homepages/f...2/6/6S3PEV.pdf

I do not know the specific origin of this data sheet, most Soviet era data sheets do not list specific vendors. It probably came out of some design bureau in Moscow or St. Petersburg. Russian language data sheets are packed with these tubes, complete with inspection stamp which is both on the tube and the data sheet.. (And the symbol for Reflektor, the only maker I have identified for the EV version)
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Old 7th January 2014, 02:30 AM   #209
Old Tele man is offline Old Tele man  United States
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Thanks! I was interested in looking at the "additional" tube info that Russian tubes seem to publish that USA tubes didn't provide.
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Old 7th January 2014, 02:54 AM   #210
kevinkr is offline kevinkr  United States
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Bear in mind that these are in fact Military surplus types, and U.S. industrial/milspec tubes have similarly or even more comprehensive data sheets. A good example would be the data sheet for the Raytheon 5842 here:

http://www.mif.pg.gda.pl/homepages/f...138/5/5842.pdf

And the WE 417A here: http://www.westernelectric.com/spec_sheets/417A.pdf
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