[Heathkit] SB-200

[Robert & Linda McGraw K4TAX]

Agreed, but those folks should look at the output on a spectrum analyzer. 
They would be surprised at the garbage being generated by the over-driven 
stage.  That garbage is generally construed as adjacent splatter.  Which of 
course is always blamed on the inadequate receiver of some other station.

73
Bob, K4TAX


----- Original Message ----- 
From: "Brian Carling" <bcarling at cfl.rr.com>
To: <Heathkit at mailman.qth.net>
Sent: Wednesday, July 26, 2006 5:17 PM
Subject: Re: [Heathkit] SB-200


> Yeah, except that a lot of guys get 800-900 watts out of them!
>
> Date sent:      Wed, 26 Jul 2006 08:46:38 -0500
> From:           Robert & Linda McGraw K4TAX <RMcGraw at Blomand.Net>
>
>> 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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>> >
>> >
>> > _______________________________________________
>> > List Administrator: Duane Fischer, W8DBF
>> > ** For Assistance: dfischer at usol.com **
>> > $$ See the vintage area on the HCI web site - http://www.w9wze.org $$
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>>
>
>
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