[Amps] DRAKE L7 Plate meter update 2 and now PS

[R at contesting.com]

On Mar 17, 2006, at 3:47 AM, HAROLD B MANDEL wrote:

> Dear Marc,
>
> They might be bleeder resistors.
>
> With just the HV supply running and the tubes not conducting, the
> bleeders are across the HV output.
>
> I run 100K ohms at 200 watt resistance on a 3.5 ~ 4.25 KV supply
> and it gets warm.
>
> Last year I built a supply using 100K at 50 watts, 4 pieces in series,
> and one of them failed and I accidently touched the HV+ beehive
> stud 1/2 hour after shutdown and I was belted across the room!

High-value WW resistors are not reliable enough to be trusted in HV 
bleeder service.
>
> Do the math. Measure what your HV is and calculate the
> amperage and wattage going through the resistors.
>
> You might want to consider an upgrade in devices if they are
> cooking during operation.
>
> Hal
> W4HBM
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> On Fri, 17 Mar 2006 11:15:56 -0000 "Marc Wullaert"
> <marc.wullaert3 at pandora.be> writes:
>> Hi ,
>>
>> The plate meter whas resoldered and it is working.Probely a bad
>> joint
>> Now when running the amp in standby the R9 and R10 (50k-50watt)
>> They running hot and give a burning smell after a time .Checked
>> time
>> visual but seem's ok.I   already cleaned out the dust from the ps.
>>
>> What is the job of this resistors ?Could they be removed from the
>> power
>> suplly
>>  or it is best to replace them  with others ?
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>



Rich Measures, 805.386.3734, AG6K, www.somis.org