Be sure you INSULATE the high voltage end of the resistor from ground.
I mounted a bleeder resister with just the supplied metal mounting brackets.
The high voltage end arced to
ground and blew up all kinds of things. ....
Just a quick FYI...
73 and good luck
Jim W7RY
-----Original Message-----
From: km1h@juno.com <km1h@juno.com>
To: amps@contesting.com <amps@contesting.com>
Cc: wb8jkr@juno.com <wb8jkr@juno.com>; n4vos@mis.net <n4vos@mis.net>;
amps@contesting.com <amps@contesting.com>
To: <amps@contesting.com>
Date: Saturday, February 20, 1999 5:11 PM
Subject: Re: [AMPS] resistors
>
>
>
>On Sat, 20 Feb 1999 05:43:15 -0800 Rich Measures <measures@vc.net>
>writes:
>>
>>
>>
>>>
>>> Last time I did this I used a piece of an old
>>>fiberglass fishing rod (the large end) and ran
>>>it through the resistors leaving about 3/4" extending
>>>on each end and then clamped the ends onto standoffs.
>>> On just about every alpha 77 I've worked on I've found
>>>some arc damage from the bleeders to the mounting bolts,
>>>don't like that method.
>>>
>>>Mark WB8JKR
>>>
>>? Good point. Through-bolt mtg. also blocks cooling air.
>
>
>Not if done by the mfgs book.
>
>
> 100k
>>wirewound resistors are known to have a high failure rate.
>
>
>
>Details please.
>
>
>If I
>>wanted a
>>Reliable bleeder for a 4kV C-filter supply, I would series up 8 to 10
>>Matsushita/Panasonic 100k-ohm, 3w MOF resistors on a piece of
>>perfboard
>>and be done with it.
>>
>
>
>Absolute YUK ! 800K to 1M bleders..no way Jose.
>
>
>Get a freebie Mouser catalog and put fresh batteries in the calculator.
>Take nothing for granted unless you can prove it within reason. Ignore
>voodoo cures.
>
>73 Carl KM1H
>
>
>
>>>On Sat, 20 Feb 1999 10:11:49 -0800 "Ron Spencer" <n4vos@mis.net>
>>writes:
>>>>
>>>>Hello I need some help here. I working on the power supply for the
>>>>8877 tube. The question I have is how to mount the bleeder resistors
>>>>I have two ohmnite about 7 inches long, they are 100 watt 100k which
>>
>>>>will be in series. Can I use a thur bolt ? or would this be two
>>risky ?
>>>>
>>>>Ron n4vos@mis.net
>>
>>
>>
>>Rich...
>>
>>R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
>>
>>
>>--
>>FAQ on WWW: http://www.contesting.com/ampfaq.html
>>Submissions: amps@contesting.com
>>Administrative requests: amps-REQUEST@contesting.com
>>Problems: owner-amps@contesting.com
>>Search: http://www.contesting.com/km9p/search.htm
>>
>>
>
>___________________________________________________________________
>You don't need to buy Internet access to use free Internet e-mail.
>Get completely free e-mail from Juno at http://www.juno.com/getjuno.html
>or call Juno at (800) 654-JUNO [654-5866]
>
>--
>FAQ on WWW: http://www.contesting.com/ampfaq.html
>Submissions: amps@contesting.com
>Administrative requests: amps-REQUEST@contesting.com
>Problems: owner-amps@contesting.com
>Search: http://www.contesting.com/km9p/search.htm
>
--
FAQ on WWW: http://www.contesting.com/ampfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|