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[AMPS] resistors

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Subject: [AMPS] resistors
From: (Rich Measures)
Date: Mon, 22 Feb 1999 08:29:01 -0800

>Rich says:
>>?  References, please.  .  In a typical 8171 anode-supply, a 100k-ohm 
>>bleeder would dissipate 810 watts.  
>>>>>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
>>piece of 
>>>>>perfboard and be done with it.  
>I'm puzzled. 810 watts dissipation in 100K means 9kV across it. That seems a
>bit high for the 8171.
?  The rating for A-zero emission is 7500VDC.  I ran mine at 9100v-No 
load / c. 7800v under ssb modulation.  I have heard that 10kV no-load is 
ok for ssb service.  At the AM rating, the peak anode supply potential is 
10kV under 100% modulation.  .  

>If the 3w MOF resaistors are rated at 500volts, 10 of them give you 5kV, and
>that's a hell of a lot less than 9kV.
?  In that amplifier I used a 40k-ohm 10w R across each of the 20 
electrolytic filter  caps.
This was before I tested Matsushita's MOF resistors.  For example, a 
100-ohm 3w rated  unit will dissipate 12w for one-hour with little ill 

-  cheers, Peter


R. L. Measures, 805-386-3734, AG6K,  

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