Re: PM Tubes (fwd)

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

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
>