Re: G05 tube ground question

Ummm, a slight error here in my previous reply, the capacitance of a
picture tube is in micro-micro farads (pico-farads), not micro. A slip of
the wrist uufd is the correct value.

Thanks Roger for pointing that out. Actually I was thinking of getting my
cool cap meter (measures capacitance in-circuit(!) - but it's been out of
production since the late 80's) and measuring it today for fun.

John :-#)#

At 10:43 PM 02/05/2002 -0700, John Robertson wrote:

>The 'aquadag' coating on the outside of the picture tube must be connected
>to the monitor chassis common for the tube to charge up correctly...it is
>only a giant glass capacitor after all, a few ufd at 20Kv...you can use a
>spring if you like, but it must make a good contact to the tube coating
>and cover a few square inches. A better solution is to get a piece of
>braided wire and run it across the rear of the tube with a spring to keep
>the braid from touching the yoke. Then solder a jumper wire that can be
>either soldered or screwed to the chassis common.
>
>John :-#)#
>
>At 08:08 PM 02/05/2002 -0400, Curtis H. Wilbar Jr. wrote:
>
>
>>Had this embedded in a longer post... so for those that have seen it
>>sorry for the duplication, however I think some people may not have seen
>>it because it was embedded in a longer post...
>>
>>My Electrohome G05-801 (Asteroids) metal "strap" used for groudning
>>the monitor tube is rotted off (found a piece of it in the bottom of the
>>game).
>>I don't see a wire floating around, but I assume that this strap is used
>>for grounding the back coating on the monitor tube.
>>
>>What are the issues with this not being grounded...
>>I've seen some monitors (like amplifone) use a spring to ground that coating
>>to the monitor frame. Would that be one way of rectifying the rotted
>>off strap ?
>>
>>Thanks in advance,
>>
>> -- Curt

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Received on Fri May 3 08:46:45 2002