[vcf-midatlantic] Museum Artifact Report
jeffrey at vcfed.org
Fri Oct 13 18:49:35 EDT 2017
We appreciate whatever work you do to repair the TR-20! It's a hobby after
all! It will be great to see it actually work instead of just looking at a
On Fri, Oct 13, 2017 at 12:53 PM, Bill Inderrieden via vcf-midatlantic <
vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:
> ---------- Forwarded message ----------
> From: SVCatITC at aol.com
> To: vcf-midatlantic at lists.vintagecomputerfederation.org
> Date: Fri, 13 Oct 2017 12:53:19 -0400
> Subject: Museum Artifact Report
> Hello All;
> I figured it was time, (Since the UNIVAC Pix spread was sent by Bill D.)
> that I would also update us all on the progress of getting the EAI TR20
> on line.
> 1. Progress is slow, but moving forward on getting a decent stable
> in the test bed for doing integrator tray testing from our TR20.
> The test bed has to undergo some major revamp to make room for more
> test components to use with the main test evaluations. We are doing
> revamp and fabrication here at my shops.
> Reference components have been purchased and now have to be installed.
> 2. A master 10 volt reference, to be used for setup and maintenance of the
> rack reference, as well as the test bed reference, has been purchased.
> This reference is good to better than 0.02 % error, which will be 5x
> than we need for computation.
> 3. I still need to get out to a machine shop to fabricate the wheeled
> dolly for
> the main rack display. This will allow us to roll the rack in and out
> of it's
> berth for easy maintenance access.
> 4. Back lighting has been purchased for accent lighting on the TR20 while
> the rack, as it will be in shadows when the XY plotter gets installed.
> 5. The TR20 main power supply oscillates at high frequency. Being an
> alumnus of EAI, I fought this problem in these supplies when working
> The solution has already been installed in the test bed,
> (as my supply did also osc. in the bed). I have more updated parts to
> install in a
> duplicate 10.179 supply, which will then be installed in the TR20.
> The original supply will be left untouched and be put "under
> to show the workmanship to visitors. This update will also be done
> the 10 volt reference in the rack and the original rack tray be put
> glass as well for viewing.
> The work goes slow as I have had several "real job" work projects and
> "life stuff"
> that has gotten in the way of doing this fun stuff.
> I will try and give further updates as they move forward.
> Bill Inderrieden.
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