[Heathkit] More on HW-101 Finals

[Ted Bruce]

Ken,
It's quite a bit lower on ten meters.  My notes are
scattered around here somewhere, but I seem to
remember that it was around 15 Watts or so, and when I
replaced the Sylvania IF tube with a Daystrom, it
doubled the output.

At this point, in addition to doing the special
neutralization technique, I'm going to go back and
redo the HFO peaking as well.  I have never gotten
more than 90 or so Watts with the rig on 80 through
20, with about 60 on 15, but I only recently tried it
on 10, and realized the significance of the problem.

I'll recheck all bands as-is, and then do the work on
the rig to compare it.  I'll put the GE 6146B's back
in, to keep the 6146W's "NIB" (almost). 
--- "Kenneth G. Gordon" <kgordon2006 at verizon.net>
wrote:

> On 5 May 2007 at 15:54, Ted Bruce wrote:
---snip---
> > "6146W-GE (GE Brand) is not recommended for
> Kenwood
> > transceivers, and is not interchangable with the
> > 6146B."
> 
> Right.
> 
> > 
> > Well, the pair I pulled out were GE 6146-B tubes,
> > which a Heathkit HW101 bulletin (#89, I think)
> said
> > that the GE 6146B tubes were finally deemed
> > appropriate for the HW-101.
> 
> I just re-read that bulletin: what it says is that
> certain 6146Bs have 
> been, "...reworked by GE..." to be suitable for use
> in the HW-101 (and 
> the other SB/HW rigs). These have 6146B etched in
> the glass 
> somewhere, but say 6146A in paint on the tube or on
> the base also. 
> That bulletin also says that 6146A tubes are "...no
> longer available from 
> the manufacturer..."
---snip---
Well, I can't find my bulletin list that goes beyond
#85.  I thought that the latest bulletin was more
definitive, recommending the GE 6146B for all
replacements, as of a certain date.  I'll keep digging
to make sure I've got that right
> 
> Well, the 6GH8A works great for me.
> 
> I also use 6AH6s as the receiver RF amp and 1st
> mixer tubes since 
> 6HS6s are so hard to find.

I actually have a few 6HS6s, but I'll check to see if
the 6AH6 helps.  It will probably mean another trip to
downtown Atlanta to get some.
> 
> I have been using a pair of real 6146Bs (not the
> etched kind) in my 
> HW-101 for the past year, and they have worked just
> fine, but I had to 
> be extremely careful about the neutralization, both
> for the finals and for 
> the driver. I used the remove-the-B+ method to
> neutralize the finals.

That's the plan here, as well.
 
> The problem I am having now with my HW-101 is that
> the VFO won't 
> track properly. According to one of the HW-101
> bulletins, I have to 
> change a capacitor in the VFO.

When I first got the rig, the VFO was way off, due to
some serious banging around by UPS.  The bottom cover
was dented on one corner, in fact.  It took a couple
of hours of tweaking (after warmup), but I got the VFO
aligned within a kiloHertz end-to-end (and in the
middle) on the 500 kHz range.

I'll get to the realignment in a couple of days and
let y'all know what's what.  
> 
> Ken Gordon W7EKB
> 

73,
Ted KX4OM


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