>Semiconductors all over the radio blow before
>the fuse does.
One of Murphy's Laws of Electronics! The circuit intended to be
protected BY the fuse will blow first, thereby protecting the fuse!
> And let's not talk about the time I touched one of the plate
>caps on an SB-200 because I thought it was loose and forgot that HV was on.
Ouch! Makes me think of what I almost did. About a year ago I powered
up the filaments on my amp as part of some initial smoke tests. I was
tempted to touch the anode and make sure the tube was well seated in the
socket. I didn't. When I went to turn the filaments off, I noticed my
HV meter was not zero. Unbeknowns to me, I had earlier left the HV
supply switch turned on so when I turned on the filament switch, the HV
was on as well - at 6 KV! I about fainted and I still get queasy till
this day thinking of what I almost did.
**** But I followed a rule I set for myself and I lived. And that was
to NEVER touch the tube when the filaments are on w/o first DOUBLE and
TRIPLE checking to make sure that the HV is off. I'm grateful I made
that rule!
73,
Jon
KE9NA
--------------------------------------------------------------------------
Jon Ogden
jono@enteract.com
www.qsl.net/ke9na
"A life lived in fear is a life half lived."
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