I believe it's all about speed and capacity.

Mac Man Mark
Macintosh Computer On-site Service
[EMAIL PROTECTED]
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(Double Play Band, too)


> From: Jeff Walther <[EMAIL PROTECTED]>
> Subject: Re: Larry Pina
> 
>> most likely the neon bulb is being used to protect the picture from
>> arcing, it's probably between ground and one of the tube electrodes
>> that's normally no where near the 60-70 volts it takes to turn on a
>> neon, but when there's a certain type of fault the lamp conducts and
>> limits the voltage to a low enough value to prevent arcing inside the
>> tube, which can do real damage to the tube.  so if the neon comes on,
>> something is wrong, and it's preventing more severe damage.
> 
> Thank you, Philip.  That makes a lot of sense.   Any idea why they
> don't use a Zener Diode for this?  Too hard to get a high enough
> breakdown voltage or can't handle enough power?  Or this is an AC
> circuit and it wouldn't work there...
> 
> Jeff Walther


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