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# Re: [TCML] Marx

```Got it all.  That must make quite a crack when it fires!!!

On 2/13/2016 11:36 AM, doug wrote:
```
```Hi Ed;

```
```1. Does the main gap fire on every pulse? Doesn't look that way in the
```
```playback but may be some sort of strobe effect?
YES!
```
```2. What is the charger supply voltage?
```
```20KV

```
```3. Your main gap appears to have a spacing of the order of 2-1/2". What
```
```is the maximum spark length you can get when you open it up.
4 inches plus
```
```4. What resistor values are you using? Can't read color code.
```
```
```
[This is as per Bert Hickmans recommendation,] value (per stage) of 200k to 1
```Meg, made up of a series string of HV Pulse-rated resistors such as 1W
Vishay VR68 resistors. These resistors are capable of handling HV pulses
of up to 10 kV, so a string of two in series for each stage should do
the trick. I found that Digikey has 220k 1W VR68's in stock for
small-quantity purchase at a reasonable price:
```
http://www.digikey.com/product-detail/en/VR68000002203JAC00/VR68J220KCT-ND/1995214
```Doug

-----Original Message----- From: Ed
Sent: Saturday, February 13, 2016 1:42 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Marx

Got it all.  Questions:

1. Does the main gap fire on every pulse?  Doesn't look that way in the
playback but may be some sort of strobe effect?

2. What is the charger supply voltage?

3. Your main gap appears to have a spacing of the order of 2-1/2". What
is the maximum spark length you can get when you open it up.

4. What resistor values are you using?  Can't read color code.

Thanks,

Ed

On 2/13/2016 5:19 AM, doug wrote:
```
Thank you Ed; Brass balls are from MC MASTER CARR, Caps are 15KV/1nf [China] Resistors [Thanks to advice from Bert H.] are from here >> http://www.digikey.com/product-detail/en/VR68000002203JAC00/VR68J220KCT-ND/1995214
```Doug
-----Original Message----- From: Ed
Sent: Saturday, February 13, 2016 3:52 AM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Marx

Beautiful!  Resistor and capacitor details?  Where did you get the brass
balls?

Thanks,

Ed

On 2/12/2016 10:54 AM, doug wrote:
```
I just finished this little Marx. https://www.youtube.com/watch?v=f6gEAlC1y0c&feature=youtu.be
```Doug
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