SB-200

[Dale Smith]

The only thing I would ad is to watch your amp plate current,I use a ranger
with a swan mark-1 ,and keep it at 250 mills or so...dale
----- Original Message ----- 
From: "Peter A Markavage" <pmarkavage at JUNO.COM>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Sunday, February 20, 2005 10:47 AM
Subject: Re: [HEATH-TEMPE] SB-200


> It's a linear amplifier. There's really no need to dip the dipper and
> peak the peaker on a SB-200. Adjust your 820 for "normal operation" (dip,
> load, drive, ALC, etc.) preferably into a dummy load, put the SB-200 in
> line, key both, grab both the tune and load controls and adjust for
> maximum RF output. Minor touching up of the 820 plate and load controls
> might be necessary if the 820 is not looking at approx. 50 ohms input
> impedance of the SB-200 (which it won't). This has been my procedure with
> my SB-200 since 1969 and still using the same 572B's. Also, been running
> my SB-200 on AM since 1985 using the same procedure. In this mode, the
> driver is either an Icom 756 PRO II, a pair of Kenwood 599D Twins, or a
> Johnson Ranger running in low power.
>
> Pete, wa2cwa
>
> On Sat, 19 Feb 2005 20:02:20 -0500 Walt w3fnz <wsmk at PTD.NET> writes:
> > Thanks Bill, Tom and Bob,
> >
> > Well, I got the SB-200 up and running!   After all the investigating
> > and going around in circles, I did it.  I'm almost reluctant to say.
> >  It was only after Tom's statement about dipping the plate to get
> > the tank ckt in resonance. Wait a minute;  I knew that!  After all,
> > I tune up the 520 and the 820 all the time with no problems.   When
> > following the tune up procedure in the manual there was nothing
> > mentioned about dipping the plate current. I never zeroed in on the
> > starting point.  As soon as I began to increase the drive I dipped
> > the plate, increased the drive and adjusted the tune and load, just
> > like I do with kenwoods. Whalla!!  The SB-200 came alive.  I've got
> > 375ma on the plate with less than 50ma on the grid putting out about
> > 500w  with only 65w coming from the 820.  And I have plenty of room
> > to go more!   I can't believe I didn't realize it from the
> > beginning.  I just got so in to the manual word for word that it
> > never dawned on me.
> > If it weren't for your help I probably would still be investigating.
> >  Thanks guys, This is one I won't forget!
> > Walt, w3fnz
>
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