From: A E
X-Mailer: Mozilla 4.76 [en] (Windows NT 5.0; U)
Subject: CRT double peaking?
Date: Sat, 21 Dec 2002 12:15:50 -0500
NNTP-Posting-Date: Sat, 21 Dec 2002 12:13:13 EST
Is the mechanism of CRT end-of-life double peaking the same as 'cathode
interface' in a signal tube, ie barium orthosilicate seperating the
cathode coating from the nickel sleeve?
If so, is there a reason why I shouldn't drive the cathode of a scope
CRT with a DC-biased AC signal (notwithstanding aliasing for the moment)
to squeeze out more electron juice from the cathode?
I'm guessing the A/cm^2 wouldn't be exceeded since those parts of the
cathode that don't pass DC will pass AC, therefore increasing active
I did put a Wavetek generator on my scope Z input and definitely got an
increase in brightness, but when I disconnected the Z drive, the trace
took 3 seconds to come back, I'm trying to figure out if that's the
input circuit on the Z or the tube doesn't like my idea...
I grew up on ICs, so tubes are not my thing, but does this make sense?
Can I add a permanent mod to the scope to get brightness this way? I'm
trying to NOT replace the tube, it's a storage tube, so it's even MORE
complex than changing the tube in a regular scope.
Please, no 'get a digital storage scope' replies, I don't like those
things and I feel they are fragile, unserviceable, over-engineered,
Windows appliances (shudder) and expensive overkill for checking switch
bounce and I/O pins on 10MHz PIC circuits. :)