5A/152M perfect driver? SPICE?

[kekso22]

Hello,

I have heard a lot about the STC/ITT 5A/152M being one of the best sounding driver tubes in triode mode.
Has anybody a diagram (Ua/Ia) for triode mode connection or better a SPICE model?
I want to use it driving a AD1.

Thanks

 

[adam2a3]

Hello, I remember there is a schematic published in Glass Audio, using this valve as a driver in a single ended 300B amp. I will search for the nr/year in my magazines and return about this. Have you found any application data since you posted the question? Rgds, adam2a3

 

[andyjevans]

Hi guys, just reviving this thread in case anyone has any information of any kind on the 5A/152. Any tube that drives a 300b well is interesting. All replies welcome!

 

[OldHector]

They are available in quantity from Billingtons, if that is helpful.

Tube data: 5A-152M.pdf

Similar properties to a C3G, since it is designed to try and push a signal down a long length of wire.

Another tube like that is the 6CH6/EL821: 6CH6 Valve Museum

gm is similar for that tube, so it would be interesting if 6CH6 could be a good driver tube. (It does make a good triode because S3 is taken to a pin).

 

[Koonw]

I build this model based on the screen current max 5mA and IV plate curve where the bottom curve is -4V, and derived a Mu of about 40 for triode mode.

**** 5A_152M ******************************************
* Created on 10/14/2020 19:02 using paint_kip.jar
* [URL="http://www.dmitrynizh.com/tubeparams_image.htm"]www.dmitrynizh.com/tubeparams_image.htm[/URL]
* Plate Curves image file: 5a-152m.png
* Data source link: <plate curves URL>
*----------------------------------------------------------------------------------
.SUBCKT 5A_152M P G2 G K ; LTSpice tetrode.asy pinout
* .SUBCKT 5A_152M P G K G2 ; Koren Pentode Pspice pinout
+ PARAMS: MU=40.7 KG1=732.6 KP=459.13 KVB=12.36 VCT=0.216 EX=1.273 KG2=911.06 KNEE=62.5 KVC=2.035
+ KLAM=1.367E-11 KLAMG=3.498E-4  KD=0.2464 KC=0.2604 KR1=5.72E-4 KR2=0.0672 KVBG=0.00285 KB1=2 KB2=1.26 KB3=1.78 KB4=27.52 KVBGI=0.03904 KNK=-0.044 KNG=0.006 KNPL=50 KNSL=11 KNPR=120 KNSR=29
+ CCG=10P CGP=0.018P CCP=5P VGOFF=-0.6 IGA=0.001 IGB=0.321 IGC=8 IGEX=1.64
* Vp_MAX=300 Ip_MAX=25 Vg_step=0.5 Vg_start=-0.5 Vg_count=15
* X_MIN=83 Y_MIN=15 X_SIZE=561 Y_SIZE=625 FSZ_X=1296 FSZ_Y=736 XYGrid=true
* Rp=1400 Vg_ac=20 P_max=5 Vg_qui=-4 Vp_qui=300 
* showLoadLine=n showIp=y isDHP=n isPP=n isAsymPP=n isUL=n showDissipLimit=y 
* showIg1=y isInputSnapped=y addLocalNFB=n
* XYProjections=n harmonicPlot=y dissipPlot=n 
* UL=0.43 EG2=150 gridLevel2=y addKink=y isTanhKnee=n advSigmoid=y 
*----------------------------------------------------------------------------------
RE1  7 0  1G    ; DUMMY SO NODE 7 HAS 2 CONNECTIONS
E1   7 0  VALUE=  ; E1 BREAKS UP LONG EQUATION FOR G1.
+{V(G2,K)/KP*LOG(1+EXP((1/MU+(VCT+V(G,K))/SQRT(KVB+V(G2,K)*V(G2,K)))*KP))}
RE2  6 0  1G    ; DUMMY SO NODE 6 HAS 2 CONNECTIONS
E2  6 0  VALUE={(PWR(V(7),EX)+PWRS(V(7),EX))} ; Kg1 times KIT current
E4   8 0  VALUE={V(P,K)/KNEE/(KVBGI+V(6)*KVBG)}
E5  81 0  VALUE={PWR(V(8),KB1)}
E6  82 0  VALUE={PWR(V(8),KB2)}
E7  83 0  VALUE={PWR(V(8),KB3)}
E8   9 0  VALUE={PWR(1-EXP(-V(81)*(KC+KR1*V(82))/(KD+KR2*V(83))),KB4)*1.5708}
RE4  8 0  1
RE5 81 0  1
RE6 82 0  1
RE7 83 0  1
RE8  9 0  1
RE21 21 0 1
E21  21 0 VALUE={V(6)/KG1*V(9)} ; Ip with knee but no slope and no kink
RE22 22 0 1 ; E22: kink curr deviation for plate
E22  22 0 VALUE={V(21)*LIMIT(KNK-V(G,K)*KNG,0,0.3)*(-ATAN((V(P,K)-KNPL)/KNSL)+ATAN((V(P,K)-KNPR)/KNSR))} 
G1   P K  VALUE={V(21)*(1+KLAMG*V(P,K))+KLAM*V(P,K) + V(22)}
G2   G2 K  VALUE={V(6)/KG2*(KVC-V(9))/(1+KLAMG*V(P,K)) - V(22)}
RCP  P K  1G     ; FOR CONVERGENCE
C1   K G  {CCG}  ; CATHODE-GRID 1
C2   G P  {CGP}  ; GRID 1-PLATE
C3   K P  {CCP}  ; CATHODE-PLATE
RE23 G 0 1G 
GG G K VALUE={(IGA+IGB/(IGC+V(P,K)))*(MU/KG1)*
+(PWR(V(G,K)-VGOFF,IGEX)+PWRS(V(G,K)-VGOFF,IGEX))}
.ENDS
*$

 

[andyjevans]

Yes - it seems there are quantities around and much cheaper than C3G. Thanks for the information.

 

[Zoran]

thanks for spice model 🙂
very linear tube
cheers