Re: PM Tubes (fwd)

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

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
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