[Heath] SB200 HV Question

[Ken, W8EK]

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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