Shared but another builder
6 cells made and did measurements on all 6. The cheap meter I am using also give the frequency being used during test if you press a button, so I included that information in reading below.
Test of 6 sets of tubes outer 1/2” x 3 ½” inner 3/8” x 4” using capacitance meter above
Outer Pos Lead Out Neg Lead
Cap in pF Freq in Hz Cap in pF Freq in HZ
1. 31.75 - 31.80 667140 29.76 – 29.80 667680
2. 31.95 - 32.01 666750 29.83 – 29.93 667444
3. 31.32 - 31.47 667160 29.71 – 29.74 667840
4. 31.95 - 32.03 667108 30.20 – 30.33 667550
5. 31.51 – 31.63 667310 30.25 – 30.33 667735
6. 31.96– 32.07 667007 30.43 – 30.57 667512
This one is with bottom spacer on both ends so inner tube sticks out both ends. I wanted to see if capacitance changed to see if this could be used to tune system.
7. 32.86 – 33.11 667540 31.19 – 31.31 667840
the frequency is 667140 (six hundred sisxty seven ty thousand and one hundred forty)
not 667.14 (six hundred sixty seven point forteen)