[Heathkit] SB-200

[Robert & Linda McGraw K4TAX]

Remember too that the drive power appears as part of the output power in a 
GG linear amp.

So, with 600 watts power output with 100 watts of drive, the amp is 
developing only 500 watts.  At 1 KW DC input this is 50% efficiency.  About 
right for most amps.

73
Bob, K4TAX



----- Original Message ----- 
From: "Brian Carling" <bcarling at cfl.rr.com>
To: <Heathkit at mailman.qth.net>
Sent: Wednesday, July 26, 2006 6:04 AM
Subject: RE: [Heathkit] SB-200


> Heathkit SB200 - see comments from many hams at:
> http://www.eham.net/reviews/detail/1162?
>
> 1200 watts ssb input, 1000 watts CW input.
> 60 to 65% efficiency is not unusual for a GG pair of 572B tubes.
> 600 to 700 watts out should be easily obtainable.
> So 500 watts out would let you know that everything is
> basically OK.
>
> If someone can only get 300 watts out of an SB200
> something is seriously wrong. I also suspect the resistors
> in the voltage divider for the meter, OR something is bad
> in the power supply.
>
> 73 de AF4K, Bry
>
> From:           "WA3GIN in Alex. City, VA" <wa3gin at erols.com>
>
>> 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
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>
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