Ok fast question here... Lets say I would take a glass tube and put two electrods one at each end about say 2 inches apart and seal that tube..."after"... I ...
... You have the most interesting questions. ;) No gas in necessary in the tube and no gas is better. What you want is a sizable flux of high velocity...
Joseph DiVerdi
diverdi@...
Oct 3, 2004 6:10 am
286
... You have the most interesting questions. ;) Glad you find them interesting, let it not be said that I ask boring to stupid questions. Here is one more to...
There are two types of tube that produce continuous streams of x- rays. The original (Roentgen's tube) was a cold cathode (two metallic electrodes, no...
... I think the answer to this is *yes*. It is both on the outside (the stator) and on the inside (rotor). An AC induction motor with field coils mounted on...
Joseph DiVerdi
diverdi@...
Oct 3, 2004 3:56 pm
289
So can anyone tell me what the real difference is between your everyday film you buy the 35MM SLR stuff and the what X-ray film is...??? I once asked this ...
Just another comment, yes, you have to be careful when asking for advice from "experts." Similar story, when I was a kid I wanted to take pictures of stars...
Ya beware of the "EXPERTS" they are, well many it seems are experts in not knowing a bloody thing! Case in point, one day I had my company computer go down the...
Oh I had one more run in with a EXPERT! It was in my shop and the guy brought in a RF amp that needed to be tested and gragh for Frequency curve. He used my...
Hi Island: There's a fundamental trade in conventional films between grain size (resolution) and speed. For example see: http://www.priory.com/den/films.htm ...
I promised some time ago to measure the output of my high voltage power supply to see what it looks like and I did - I just forgot to report about it here. ...
Joseph DiVerdi
diverdi@...
Oct 13, 2004 3:10 am
296
... Sounds like a horrific experience and you have my (for one) sympathies. May I gently suggest that such topics, however painful, might be better discussed...
Joseph DiVerdi
diverdi@...
Oct 13, 2004 4:06 am
297
Joseph A few questions... Is your HV supply switched mode, or just transformer based? Is this spike a multiple of the mains frequency? Does the amplitude...
... John, The supply is a push-pull transformer-based inverter with a pair of MOSFETs on the primary driven by a free-running multivibrator (running at 2kHz),...
Joseph DiVerdi
diverdi@...
Oct 13, 2004 1:58 pm
299
We want to build the detector described in the homepage of the group. Which component do you recommend to start with? ... Do you Yahoo!? vote.yahoo.com -...
... Hi Hasan! Welcome aboard :-) Well, I for one started with the power supply if I remember correctly. You can either build one from scratch or use a HV...
Hi all! Just came back from the OpenDay in CERN :-) WOOHOO!!! What a day!!! Photos tomorrow! Just a few words for now: Too many things to see, too many people,...
Hi all! OK, here we go - here are the photos :-) * ATLAS magnets & detector * Accelerator factory * Anti-matter hall http://www.cosmicrays.org/muon-cern.php *...
Hi all; Slowly but surely making more progress on my detector and correlator. I built my correlator on some veroboard (moved off the original breadboard). In...
Hi Josh! ... Congratulations :-) ... Got mine from them too - good service indeed! ... So far I have not tried to measure if there are differences in the count...
Dear Friends, next weekend (on October 29th & 30th) there will be to Trento (Italy) the 2th Italian Amateur Radio Astronomy Meeting. This event is hosted by...
... Ciao Salvatore! Thanks for the notification! Trento is actually just 4 hours by car from here, but I according to the program all presentation will be in...
... Ciao Hannes, I'm sorry, but in 2004 meeting all presentation will be in italian... I hope that next year we can get organized for giving the simultaneous...
Dear Friends, next weekend (on October 29th & 30th) there will be to Trento (Italy) the 2th Italian Amateur Radio Astronomy Meeting. This event is hosted by...
Hi All, Just wanted to throw out some fodder for discussion and tap the smart brains of the group. Recently I was digging through my vacuum tube boxes and came...
Hi Raul Perhaps one way to start would be to plot a graph of current against voltage, slowly raising the voltage until the tube 'strikes' (at about 90V?)....
... Hi Raul! Hi John! I assume a current limiting resistor would be needed like for the GM tubes ? Just guessing here, since I didn't even have such a VR tube...
... Hello Raul, there is something more than electrodes and gas... some VR tubes have a radioactive primer electrode, maintaining a little ionization of the...
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