[Heath] SB200 HV Question

[Guy Giacopuzzi]

Mine's 2850 vdc idling...drops about 100 or less key down...

Guy,

WA6OQQ


On 2/3/2017 4:54 AM, Ken, W8EK wrote:
>
> Resistors for high voltage metering For Sale:
>
> Do you have a Heath linear amplifier that has an
> error in the high voltage reading? Maybe you do
> not even know it has an error!
>
> Heath used three 4.7 meg resistors in the SB-220/221
> and also in the SB-200/201 amplifiers. Almost all
> of these resistors are out of tolerance today, partially
> because of their age, but also because their voltage
> rating was exceeded.
>
> I was able to obtain a quantity of new resistors that
> are 4.7 Meg, 1% tolerance, 2 watt, and are rated to
> handle the high voltage. This compares to the original
> resistors furnished by Heath that were 4.7 Meg, 5%,
> 1 watt and about 400 volts.
>
> Buy a set of three for $3 plus shipping from Florida.
> Combine with other items to save shipping!
>
> Thanks.
>
> 73,
>
> Ken, W8EK
>
> Ken Simpson
> E-mail to W8EK at FLHam.net or W8EK at arrl.net
> Voice Phone  (352) 732-8400
>
>
>
> Paul Blumhardt wrote on 2/2/2017 9:07 PM:
>> Jim
>>
>>                 Your HV meter reading is likely low due to the voltage
>> divider resistor string going up in value. Check those resistors
>> before doing anything.
>>
>>
>>
>>                 How much power output do you see on 40 meters? Output
>> power is the real test of if your amp has a problem or not.
>>
>>
>>
>> Vy 73
>>
>> Paul
>>
>>
>>
>> *From:* Heath [mailto:heath-bounces at puck.nether.net] *On Behalf Of 
>> *Jim's
>> *Sent:* Thursday, February 02, 2017 7:51 PM
>> *To:* heath at puck.nether.net
>> *Subject:* [Heath] SB200 HV Question
>>
>>
>>
>> I have finally got my SB200 on the air. The cap’s have been replaced
>> many years ago but everything else is stock. My idling HV runs about
>> 1900v’s key down it drops to about 1750V’s. Line voltage to the amp is
>> off a separate 120 v 20amp ckt. Is this voltage normal? Should I be
>> looking for about 2500v’idiling? Would changing the caps to 180mfd and
>> changing the equalizing resistors to a lower value help?
>>
>>
>>
>> Thanks for your information
>>
>> 73
>>
>> Jim K8DHC
>>
>>
>>
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>>
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