[Amps] Loading SB-220

[Jay Musikar]

Hi Bob -

My apologies to all.  You are correct relative to
possible damage to the plate choke.

Your warning about the loading of the amp should be
heeded.  Extreme care should be used and damage can be
avoided by using the CW/Tune position.

The extra output is really not worth the damage which
can be caused by attempting to wring those extra Watts
out of the amplifier on the WARC bands.

Sri for the error.

73,
Jay/AF2C

--- "Robert B. Bonner" <rbonner at qro.com> wrote:

> Hi Pete,
> 
> Now I will give out a massive warning to anybody
> with ANY AMP.  If you have
> an amplifier that is PreWARC design and you decide
> to become a test pilot
> and fire the unit up on 12 and or 17...  YOU BETTER
> be very observant as you
> bring up the power.  As the Plate choke series
> resonates on any band it will
> leave the amplifier.
> 
> My buddy had a PreWARC amp and the first time he
> fired it up on 17 the plate
> choke left.  A call to the manufacturer provided him
> with a NEW and Improved
> choke that has lasted another 15 years without
> incident.  He still doesn't
> crank it up all the way on 17.
> 
> Since the amps (preWARC) were not tested there you
> are performing the
> resonance test.  You will know once it passes about
> 100 Watts or so.
> 
> BOB DD
> 
> -----Original Message-----
> From: amps-bounces at contesting.com
> [mailto:amps-bounces at contesting.com] On
> Behalf Of Pete Smith
> Sent: Saturday, March 03, 2007 2:25 PM
> To: Amps at contesting.com
> Subject: Re: [Amps] Loading SB-220
> 
> I don't think that is correct either, Bob - I use my
> SB-220 on 12 and 17 in
> the SSB position all the time.  I'd be willing to
> bet that this advice is
> based on having arced the tuning capacitor a time or
> two while finding the
> right setting with the loading too light.
> 
> 
> >Use LV position, and why is that Jay?  I would
> agree to get within a
> >reasonable setting with LV and pop her over to
> SSB...  But why do you say
> >stay with LV?
> >
> >BOB DD
> >
> >-----Original Message-----
> >From: amps-bounces at contesting.com
> [mailto:amps-bounces at contesting.com] On
> >Behalf Of Jay Musikar
> >Sent: Saturday, March 03, 2007 1:33 PM
> >To: Win; Amps at contesting.com
> >Subject: Re: [Amps] Loading SB-220
> >
> >GA Win -
> >
> >1. Loading on the WARC Bands must be done in the
> >CW/Tune Position.
> >
> >2. Do not operate the amplifier in the SSB position
> on
> >the WARC Bands.
> >
> >3. 17m
> >Band Switch - 15m
> >Tune - Top of the 40m markings
> >Load - 4.0
> >
> >4. 12m
> >Band Switch - 10m
> >Tune - 20m (just left or CCW)
> >Load - 4.0
> >
> >The are a number of variation on which Band Switch
> >Position to use and relative Tune and Load
> settings.
> >
> >In either case DO NOT use the SSB postion (HV).
> >
> >Good Luck es 73,
> >
> >Jay/AF2C
> >
> >--- Win <w0lz at winlyn.us> wrote:
> >
> >> Can someone comment on loading the SB-221 up on
> 18
> >> and 24 MHz. using the 
> >> existing band selections.  Will the input Z
> change
> >> much?  Which band switch 
> >> positions to use for each band?  At the moment I
> am
> >> really only interested 
> >> in 18 MHz.  As conditions get better, I will
> >> probably become interested in 
> >> 24 MHz.
> >> 
> >> Thank you in advance.
> >> 
> >> Win, W0LZ 
> >
> >
> >
> > 
>
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