[Heathkit] SB-200

[WA3GIN in Alex. City, VA]

Maybe they were thinking PEP output!

73,
dave
wa3gin


-----Original Message-----
From: heathkit-bounces at mailman.qth.net
[mailto:heathkit-bounces at mailman.qth.net] On Behalf Of w8qwl at juno.com
Sent: Wednesday, July 26, 2006 5:22 PM
To: bcarling at cfl.rr.com
Cc: Heathkit at mailman.qth.net
Subject: Re: [Heathkit] SB-200

A lot of guys lie too!

 
On Wed, 26 Jul 2006 18:17:47 -0400 "Brian Carling" <bcarling at cfl.rr.com>
writes:
> 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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> 
> 
> _______________________________________________
> List Administrator: Duane Fischer, W8DBF        
> ** For Assistance: dfischer at usol.com **         
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> $$ 
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> 
 
 
>From the desk of Dennis R. Caverly
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