Re: PM Tubes (fwd)

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

Original poster: Steven Roys <sroys@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Tue, 11 Dec 2007 05:41:14 +0000
From: "[utf-8] J R Whitmore" <jwhitmor@xxxxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: PM Tubes (fwd)

We still used the Photo-Multiplier tubes in a ARL emission spectrometer. Richard is correct about the sockets. We always kept a spare around in case one failed. 
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-----Original Message-----
From: "High Voltage list" <hvlist@xxxxxxxxxx>

Date: Mon, 10 Dec 2007 18:42:09 
To:hvlist <hvlist@xxxxxxxxxx>
Subject: RE: PM Tubes (fwd)


Original poster: Steven Roys <sroys@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Mon, 10 Dec 2007 08:59:34 -0500
From: Richard Hull <hullr@xxxxxxxxxxxx>
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 

-----Original Message-----
From: High Voltage list [mailto:hvlist@xxxxxxxxxx] 
Sent: Sunday, December 09, 2007 9:40 AM
To: hvlist
Subject: PM Tubes (fwd)

Original poster: Steven Roys <sroys@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Tue, 04 Dec 2007 20:40:41 +0000
From: Gordon Forrest <gmforrest@xxxxxxxxxxxxx>
To: hvlist@xxxxxxxxxx
Subject: PM Tubes

Hello all,

             I have a PM tube (Nuclear Enterprises (G.B.) Ltd Edinburgh, Crystal Type 12/DM//2/12 ) and need some info on it.
I've had a look online but carn't find much. It has a nice crystal on the end. I want to use it to measure X-rays.

What sort of power supply could I use and electronics to measure the output? I don't even know if it works but would like to give it a try.

                Gordon


[Sorry for the delay in getting this out.  SRR]




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