Date: Thu Apr 5 17:06:10 2007

Author: Santos Ramirez

Subject: Re: Wanted: Tubes for old Sargent-Welch e/m apparatus

That larger (20cm) tube description fits the one we have on a stand
with a tag that says Sargent-Welch model 623A.
The tube will _not_ take excess current and the tube
is very expensive to replace.

>>The boxes of the old burned-out ones we have list the bulbs as part
>>0623, and the bulb looks the same
>>from what I can see in the picture. I called S-W and they said
>>that they are the correct replacement tube,
>>which I realize doesn't guarantee anything, but am I missing
>>something? It looks like the tubes are back in the catalog.
> I contacted Steve Starling at Tel-Atomic (who apparently supply these
> tubes to Sargent-Welch) and he told me that these are not the tubes
> I'm looking for.
> My tubes contain mercury (50 Volt accelerating potential), have a
> diameter of approximately 20cm, take a current up to 4.5A, and
> contain five single posts located at known distances from the
> filament; his tubes contain neon (300 Volt accelerating potential) ,
> have a diameter of 15cm, run on a current in the hundreds of
> milliamps and contain five double posts.
> I assume there must've been a design change between the WL0623A and
> the WL0623B. (Can anyone verify that the tubes for these two
> experiments are different?)
> Scott.