[Heathkit] Need A One Ohm Variable Resistor

[manualman at juno.com]

You all have to remember that the Heathkit schematics are directly
related to the manual they came out of. The majority of the Heathkit
manuals have a specific "595-xxxx" associated with them. If changes were
applied to the design of a piece of equipment or changes applied to the
manual to reflect printed errors or clarification of assembly processes
which required the manual to updated, a suffix dash number, "595-xxxx-01"
was added to the manual code. With each iteration of the manual, the
suffix "dash code" (-01, -02, -03, etc.) was increased. From what I can
see that is floating around the web, (i.e. same schematic in multiple
places around the web) you all probably have the original or first design
released for manufacture. I have here several original IP-28 manuals
labeled 595-1092-02 and 595-1092-05 and they both have the "High Current
Control" (1 ohm pot) and take note that there were several other
component additions to the circuit. To answer your question Ken, the R
designation is R14, Part Number 11-124. As Heathkit progressed through
the years, they also decided to also include the specific manual part
code on their schematics and external Illustration Booklets. This also
helped reduce the confusion of multiple documents or diagrams having
different information. Unfortunately, there is no way to tell by
physically looking at a piece of Heathkit equipment what manual iteration
it applies to since Heathkit also issued separate service bulletins to
update a piece of equipment and sometimes they even included separate
update manual pages with the manual that came with the original kit to
update the manual and the kit building process.

Pete, wa2cwa
http://www.manualman.com

On Sun, 29 Sep 2013 11:23:05 -0700 Ken Kaplan <krkaplan at cox.net> writes:
> Pete,
> Do you know the R number? Perhaps my schematic is incorrect? R13 is 
> the 
> 100 ohm "Current Control" pot. I don't see a "High Current 
> Control".
> 
> Thanks,
> Ken
> 
> On 9/28/2013 7:23 PM, manualman at juno.com wrote:
> > In the IP-28, the 1 ohm variable is used for "high current 
> control".
> > Clearly marked on the schematic.
> >
> > Pete, wa2cwa
> > http://www.manualman.com
> >
> > On Sat, 28 Sep 2013 21:27:23 -0400 Bill Cromwell 
> <wrcromwell at gmail.com>
> > writes:
> >> On 09/28/2013 09:03 PM, W. Harris wrote:
> >>> Don't think I have ever seen a one ohm pot, but then there are
> >> lots of things I have never seen.
> >>>
> >>> Bill - K5MIL
> >>>
> >>>
> >> Hi,
> >>
> >> I saw one that was less than an ohm in some solid state audio 
> gear.
> >> It
> >> was worn out and I could not find a replacement. I used the thing 
> as
> >> a
> >> parts mule after that.
> >>
> >> 73,
> >>
> >> Bill  KU8H
> 
>