[Heathkit] SB-200

[Brian Carling]

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
> >> _______________________________________________
> >> List Administrator: Duane Fischer, W8DBF
> >> ** For Assistance: dfischer at usol.com **
> >> $$ See the vintage area on the HCI web site - http://www.w9wze.org $$
> >> Heathkit mailing list
> >> Heathkit at mailman.qth.net
> >> http://mailman.qth.net/mailman/listinfo/heathkit
> >>
> >>
> >> _______________________________________________
> >> List Administrator: Duane Fischer, W8DBF
> >> ** For Assistance: dfischer at usol.com **
> >> $$ See the vintage area on the HCI web site - http://www.w9wze.org $$
> >> Heathkit mailing list
> >> Heathkit at mailman.qth.net
> >> http://mailman.qth.net/mailman/listinfo/heathkit
> >>
> >
> >
> > _______________________________________________
> > List Administrator: Duane Fischer, W8DBF
> > ** For Assistance: dfischer at usol.com **
> > $$ See the vintage area on the HCI web site - http://www.w9wze.org $$
> > Heathkit mailing list
> > Heathkit at mailman.qth.net
> > http://mailman.qth.net/mailman/listinfo/heathkit 
> 
>