Re: [TCML] picture tube capacitor?

["Carl Noggle" <cn@xxxxx>]

I checked a few TV CRTs several years ago and they were in the range of 1000 
pF, about the equivalent of two 500pF, 30kV doorknobs.   The grey aquadag 
coating on the outside is the ground and the anode connector is the inside. 
It would probably be easiest to connect to it using a proper conductor, 
since it has a rubber suction cup-like feature that keeps sparks from 
sliding across the glass to the aquadag.  It would probably work better with 
the vacuum to avoid sliding sparks elsewhere.

---Carl




-----Original Message----- 
From: Co60bishop
Sent: Sunday, April 28, 2013 10:33 PM
To: tesla@xxxxxxxxxx
Subject: Re: [TCML] picture tube capacitor?


Yes, the metal strap that wraps around the front of the picture tube is the 
outside plate of the capacitor. There is a metalic coating on the outside of 
the picture tube that contacts the strap which is connected to ground inside 
your TV set. With voltages approching as high as 35KV applied to the CRT it 
should make a very reliable capacitor. The question is what is the 
capacitance of the tube. Check the capacitance to see if it is in the range 
you need for your design.

Allen Bishop
Principle Device Physics Tech
Aeroflex



-----Original Message-----
From: Jim Lux <jimlux@xxxxxxxxxxxxx>
To: tesla <tesla@xxxxxxxxxx>
Sent: Sun, Apr 28, 2013 8:58 pm
Subject: Re: [TCML] picture tube capacitor?


On 4/28/13 6:11 PM, HomerLea@xxxxxxx wrote:
I thought to coat the outside with foil or conducting paint for the second
terminal...I guess the tube wouldn't need it's vacuum...o/w could be rather

wouldn't worry about implosion..
e used to drop color TVs all the time for special effects jobs, and we
ad to rig them with explosives to actually get them to break.  The most
hat happens is the neck cracks and the tube vents to air.
I would think that you don't need to coat it. there's already a
onductive coating connected to that second anode terminal.  What you
eed to do is find a suitable "ground", which might be the faceplate bolts.
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