Re: PM Tubes (fwd)

["High Voltage list" <hvlist@xxxxxxxxxx>]

Original poster: Steven Roys <sroys@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Mon, 24 Dec 2007 22:23:58 -0800
From: Jonathan Peakall <jpeakall@xxxxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: PM Tubes (fwd)

I've built a couple. Best I ever got was nice 3/4 " bright sparks with a 
nice snap. I have done it with water out of the tap and recirculated. Really 
neat, as the charge builds you can watch it effect the water droplets as 
they fall, and predict the next snap. We don't have a dry season here, so 
performance can be spotty.

Jonathan
www.madlabs.info
----------------------------------------------------------------------
Some people are like a Slinky .. not really good for anything,
but you still can't help but smile when you shove them down the stairs.
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----- Original Message ----- 
From: "High Voltage list" <hvlist@xxxxxxxxxx>
To: "hvlist" <hvlist@xxxxxxxxxx>
Sent: Monday, December 24, 2007 7:26 PM
Subject: Re: PM Tubes (fwd)


> Original poster: Steven Roys <sroys@xxxxxxxxxx>
>
> ---------- Forwarded message ----------
> Date: Sun, 23 Dec 2007 14:44:21 -0800
> From: Ed Phillips <evp@xxxxxxxxxxx>
> To: High Voltage list <hvlist@xxxxxxxxxx>
> Subject: Re: PM Tubes (fwd)
>
> Gordon:
>
>    What was the original question - I've lost track.  Looks as if you
> are all set to go if you have a suitable HV supply.
>
>    While I'm writing I'll ask a general question which I think I've
> raised before.  Has anyone on the list built a Kelvin water dropper and
> if so what were the results?
>
> Ed
>
> High Voltage list wrote:
>
>>Original poster: Steven Roys <sroys@xxxxxxxxxx>
>>
>>
>>
>>---------- Forwarded message ----------
>>Date: Sun, 23 Dec 2007 20:52:59 +0000
>>From: Gordon Forrest <gmforrest@xxxxxxxxxxxxx>
>>To: High Voltage list <hvlist@xxxxxxxxxx>
>>Subject: Re: PM Tubes (fwd)
>>
>>
>>
>>
>>>>>The sockets for these are critical and contian a resistor
>>>>>divider string to distribute the high voltage and bias the
>>>>>many dynodes. Without this key component or without a proper
>>>>>pin out, you are stuck. The voltage requirements are usually
>>>>>1000 volts at the end of the dynode string. A socket might
>>>>>have as many as 10 resistors on it and 3 or 4 capacitors.
>>>>>
>>>>>While the basing of most 8 and 10 dynode tubes is similar, a
>>>>>wrong move or connection could damage the tube. Most tubes
>>>>>have 12 to 16 pins with 14 being the most common.
>>>>>
>>>>>Richard Hull
>>>>>
>>>>>
>>>>>
>>>    Without the schematic of the socket the whole subject is kind of
>>>meaningless but it's easy enough to arrange the voltage divider from
>>>small carbon film resistors soldered to the socket [if one has the
>>>socket].  Real issue is base connections and I can't help.
>>>
>>>Ed
>>>
>>>
>>>
>>
>>Hello,
>>
>>         the socket is all wired up and has a 12 foot (sorry, thats
>>3.657 6 m) cable ending with
>>a screw HV connector, the type you used to get with GM tubes.
>>
>>              Gordon
>>
>