[Heathkit] SB-200

[Peter Markavage]

I just had my SB-200 on. Runs off 120V AC. Plate Voltage reads 2100
volts. Given a shunt and meter total accuracy of +/- 10%, voltage really
could be anywhere from 1890 to 2310 volts. At the receiving end, who's
going to know the difference. If you really want to know the plate
voltage, get in there, with caution, and use a calibrated VTVM and HV
Probe and measure the voltage at the cold end of the RF choke.

Pete, wa2cwa

On Tue, 25 Jul 2006 20:04:30 -0400 "WA3GIN in Alex. City, VA"
<wa3gin at erols.com> writes:
> 500 watts is a lot for that old amp.  The tubes would have to be very 
> fresh.
> A more reasonable output might be 300-400 watts key down.  This is a 
> one KW
> amp.  60% tube efficiency.  2000volts X .5 amp - 1KW input X .60 = 
> 600 watts
> output.  If we used 2400volts the output would be 720 watts and in 
> 45 yrs
> I've never heard of a SB-200 putting out that type of power.  This 
> is a 1KW
> PEP amp.
> 
> 73,
> dave
> wa3gin
> 
> 
> -----Original Message-----
> From: heathkit-bounces at mailman.qth.net
> [mailto:heathkit-bounces at mailman.qth.net] On Behalf Of 
> KB9GKC at aol.com
> Sent: Tuesday, July 25, 2006 6:37 PM
> To: pgondos at hotmail.com; Heathkit at mailman.qth.net
> Subject: Re: [Heathkit] SB-200
> 
>  
> In a message dated 7/25/2006 6:25:55 P.M. Central Daylight Time,  
> pgondos at hotmail.com writes:
> 
> My  problem is I can only get 1900V on the meter when in HV 
> position. Manual  says 2400V. Any suggestions ? Thanks.
> 
> 
> Hello,
>  
>  The HV meter may not be accurate, the volt meter is not a lab  
> instrument 
> and could be +/- 10% off.  And the movement may have been  damaged 
> over the 
> years from being moved around.
>  
> Apply drive to the amplifier and see if you get 500 watts or so 
> output, if  
> so you know the tubes and power supply are in good shape.
>  
> 73 and good luck,
> Douglas
> Heathkit SB-101A 
> SteppIR 3 element at 60 feet