[Heathkit] Soft-Start circuit for SB-1000

[Bill Kuhn]

OK - that seems to match mine. From what I see on this one it simply has
an unmarked position which I assume is 10M and it appears to be hooked
up. I haven't looked into that section to see exactly what should be
there yet.

Thanks!

73 DE NO0OO

-----Original Message-----
From: Albert Morris [mailto:wb8feq at bellsouth.net] 
Sent: Sunday, November 29, 2009 12:52 PM
To: Bill Kuhn
Subject: RE: [Heathkit] Soft-Start circuit for SB-1000

Bill.

I have an SB-1000 I built from kit when they were still being sold.  I
have not looked into a soft start mod but the 10 Meter band was included
from start (at least at the time I got mine).  There was a jumper on the
band switch that shorted out the 10 meter section and of course it is
not marked on the front panel.  I left that jumper out from the start
and the amp works great on 10 with about 900 watts on CW according to my
Bird 43 meter.

Good luck and 73 - Al WB8FEQ

-----Original Message-----
From: heathkit-bounces at mailman.qth.net
[mailto:heathkit-bounces at mailman.qth.net] On Behalf Of Bill Kuhn
Sent: Sunday, November 29, 2009 10:46 AM
To: heathkit at mailman.qth.net
Subject: [Heathkit] Soft-Start circuit for SB-1000

I've finally started work on cleaning up an SB-1000 I purchased from an
estate last spring.

 

The amp had a couple of home-made modifications - one I'm pretty sure is
a soft-start circuit and the other is ??? maybe a QSK circuit?? What
appears to be a soft-start module looks to be fairly well constructed,
but it is a breadboard so I'm assuming it is homemade. The other circuit
looks like a child got loose with a soldering iron, and has 2 dangling
leads that go nowhere. Because of that, I haven't even tried to power it
on. I think this also has a 10 meter mod.

 

My strategy is to pull out anything that doesn't match the
manual/illustrations/schematic and bring this back to a base SB-1000 and
see if it works. If the board that appears to be a soft-start is in fact
usable, I guess I should leave it. The other circuit is out.

 

To my question (finally)..

 

Is there a good schematic available of what a soft-start circuit should
be and how it should be connected in an SB-1000? I'd like to verify what
I have.

 

Thanks!

 

73 DE NO0OO

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