Re: Topband: Heathkit SB-1000

[Herbert Schoenbohm <herbert.schoenbohm@gmail.com>]

If you see no dip in the PA current then check and see if the tuning 
capacitor padding capacitor is open or disconnected.  Check the leaf on 
the band switch that corresponds to the `160 meter position which also 
switches in the additional fixed capacitor and make sure it is making a 
good contact.  In some  amps I have seem this auxiliary contact actually 
burn off.

Herb Schoenbohm, KV4FZ

On 12/17/2015 6:54 AM, Rich Cariello wrote:
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> Jim,
> To get closer to the needed value of the additional transmitting cap I would 
> try to find out the max value of the load cap that came with the amp. Halve the 
> value and that's what I would install. I recall the amp would kind of tune up 
> around 2 mg with max load cap value. Adding an additional 50% cap allowed the 
> amp to tune the hole 160 meter band. Bottom line just put in whatever you have 
> and see what happens. But if you need to go out and buy something then the 50% 
> cap value should do you.
> Rich AA2MF
>
>
> Sent from my iPad
>
> > On Dec 17, 2015, at 05:33, Rich Cariello <rlcariello@verizon.net> wrote:
> >
> > Jim,
> > If I remember correctly placing an additional transmitting type cap across the 
> > units load cap did the job. Don't remember the value I used. My guess 100 or 
> > 200 PF. I used a cap I had in the junk box. You will need to remove the cap in 
> > most cases for the other bands.
> > Rich AA2MF
> >
> > Sent from my iPad
> >
> > > On Dec 17, 2015, at 01:17, Jim Murray via Topband <topband@contesting.com> 
> > > wrote:
> > >
> > > Anybody know how to make an SB-1000 tune properly on 160?  Ok on other bands 
> > > but doesn't like 160, dummy load or well tuned Inv.L.   Is it a quirk of the 
> > > amp needing a modification or possibly a bad component?  Saw nothing obvious 
> > > before putting it to use but have not had the cover off since.Thanks,Jimk2hn
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