LS7/CV1660

[Maryjusz]

Good morning!

Does anyone use LS7 / CV1660?

Does anyone have access to the characteristics?

 

[cv1040]

There's not much published info on the web about these.

This link will take you to a post-office data sheet giving you limited informatoin

CV1660 @ The Valve Museum

If you were looking for the triode curves, you'd probably have to buy a few, if you don't have some already, and trace them or have someone trace them for you. Maybe another member has done so already, I'm not sure.

I've been meaning to get some for a little while and do have a curve tracer but the purchase price in the UK is a little steep so I've not taken the plunge.

Interesting DHT valve though.

 

[Maryjusz]

I found only this 🙂

 

[cv1040]

Good find, looks like someone hand traced a few curves, but you could do with a bit more detail to make an informed decision about a good operating point.

Still it's a useful DHT for a pre-amp stage, if that's what you had in mind, fairly low anode resistance, good mu.

 

[Rod Coleman]

Yes, a good DHT preamp. I would just run it near the data sheet operating point: Va=130V, Vg=-4V The exact anode current will not be too important.

 

[Datun Walnut]

I know I'm late to the party but I have a few traces from various CV1660s

 

[Zoran]

**** LS7_VT82_CV1660 ****************************************** * Created on 05/05/2024 13:11 using paint_kit.jar 3.1 * www.dmitrynizh.com/tubeparams_image.htm * Plate Curves image file: /Users/zoran/Desktop/Model_Paint_Tools/Graph/ * Data source link: *---------------------------------------------------------------------------------- .SUBCKT LS7_VT82_CV1660 1 2 3 ; Plate Grid Cathode + PARAMS: CCG=12.7P CGP=12.7P CCP=12.7P RGI=2000 + MU=11.29 KG1=2356.2 KP=120.12 KVB=202.5 VCT=-1.56 EX=1.384 * Vp_MAX=300 Ip_MAX=30 Vg_step=2 Vg_start=4 Vg_count=13 * Rp=12000 Vg_ac=3 P_max=3 Vg_qui=-4 Vp_qui=150 * X_MIN=108 Y_MIN=45 X_SIZE=646 Y_SIZE=630 FSZ_X=1536 FSZ_Y=798 XYGrid=true * showLoadLine=y showIp=y isDHT=n isPP=n isAsymPP=n showDissipLimit=y * showIg1=n gridLevel2=n isInputSnapped=n * XYProjections=y harmonicPlot=y dissipPlot=y *---------------------------------------------------------------------------------- E1 7 0 VALUE={V(1,3)/KP*LOG(1+EXP(KP*(1/MU+(VCT+V(2,3))/SQRT(KVB+V(1,3)*V(1,3)))))} RE1 7 0 1G ; TO AVOID FLOATING NODES G1 1 3 VALUE={(PWR(V(7),EX)+PWRS(V(7),EX))/KG1} RCP 1 3 1G ; TO AVOID FLOATING NODES C1 2 3 {CCG} ; CATHODE-GRID C2 2 1 {CGP} ; GRID=PLATE C3 1 3 {CCP} ; CATHODE-PLATE D3 5 3 DX ; POSITIVE GRID CURRENT R1 2 5 {RGI} ; POSITIVE GRID CURRENT .MODEL DX D(IS=1N RS=1 CJO=10PF TT=1N) .ENDS LS7_VT82_CV1660 *$

 

[Zoran]

Spic model for other measurement.
main difference in Vct value.
I am wondering how the measurements are taken in the huge Ia region that exceeds max values?
Up to 64mA😱
🙁
.
cheers

**** LS7_VT82_CV1660_01 ******************************************
* Created on 05/05/2024 14:03 using paint_kit.jar 3.1
* www.dmitrynizh.com/tubeparams_image.htm
* Plate Curves image file: /Users/zoran/Desktop/Model_Paint_Tools/Graph/
* Data source link:
*----------------------------------------------------------------------------------
.SUBCKT LS7_VT82_CV1660_01 1 2 3 ; Plate Grid Cathode
+ PARAMS: CCG=12.7P  CGP=12.7P CCP=12.7P RGI=2000
+ MU=11.29 KG1=2356.2 KP=94.89 KVB=91.12 VCT=0 EX=1.384
* Vp_MAX=420 Ip_MAX=64 Vg_step=1 Vg_start=2 Vg_count=12
* Rp=12000 Vg_ac=3 P_max=3 Vg_qui=-4 Vp_qui=150
* X_MIN=171 Y_MIN=120 X_SIZE=1118 Y_SIZE=747 FSZ_X=1841 FSZ_Y=973 XYGrid=true
* showLoadLine=y showIp=y isDHT=n isPP=n isAsymPP=n showDissipLimit=y
* showIg1=n gridLevel2=n isInputSnapped=n
* XYProjections=y harmonicPlot=y dissipPlot=y
*----------------------------------------------------------------------------------
E1 7 0 VALUE={V(1,3)/KP*LOG(1+EXP(KP*(1/MU+(VCT+V(2,3))/SQRT(KVB+V(1,3)*V(1,3)))))}
RE1 7 0 1G  ; TO AVOID FLOATING NODES
G1 1 3 VALUE={(PWR(V(7),EX)+PWRS(V(7),EX))/KG1}
RCP 1 3 1G   ; TO AVOID FLOATING NODES
C1 2 3 {CCG} ; CATHODE-GRID
C2 2 1 {CGP} ; GRID=PLATE
C3 1 3 {CCP} ; CATHODE-PLATE
D3 5 3 DX ; POSITIVE GRID CURRENT
R1 2 5 {RGI} ; POSITIVE GRID CURRENT
.MODEL DX D(IS=1N RS=1 CJO=10PF TT=1N)
.ENDS LS7_VT82_CV1660_01
*$

 

[zenzen]

Found this.