RE: PM Tubes (fwd)

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

Original poster: Steven Roys <sroys@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Mon, 10 Dec 2007 23:09:29 -0800
From: Dave Halliday <dh@xxxxxxxxxxxxxx>
To: 'High Voltage list' <hvlist@xxxxxxxxxx>
Subject: RE: PM Tubes (fwd)

And also, do not apply power to it while it is in the light.  This can cause
a meltdown of the dynodes.  For some of these puppies, full-signal is
measured in hundreds of photons/second.

Dave 

> -----Original Message-----
> From: High Voltage list [mailto:hvlist@xxxxxxxxxx] 
> Sent: Monday, December 10, 2007 5:42 PM
> To: hvlist
> 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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Checked by AVG Free Edition. 
Version: 7.5.503 / Virus Database: 269.17.0/1180 - Release Date: 12/10/2007
2:51 PM