[Hallicrafters] Cleaning a dirty rusty SX-28 chassis?

[wa1kbq at aol.com]

 Sending the chassis out for cleaning and new cadmium plating is the best approach but it's not an easy job. The wiring harness and tube sockets can be dropped out together. If you will not be replating the following assumes an extreme case where the unit has to be restored and there is no better practical solution and the job is beyond rescuing with metal polish. Disassemble the receiver as close as you can get to a bare chassis. Cover any transformers you decide not to remove with plastic bags and rubber bands and tape over slots around things and holes in the top of things, etc. Pick a hot sunny day and plan to work outside on a suitable old bench or old card table etc. Arrange to have at hand a hose with a spray nozzle, shop vac with the hose on the blowing side or an air compressor, assortment of brushes including old tooth brushes, a pick or an old screwdriver to scrape with, a wire brush, muriatic acid, phosphoric acid, a 50-50 mix of Westley's Bleche-Wite and ammonia in a plastic sprayer bottle and a good pair of rubber gloves. 
 
Clean the chassis with phosphoric acid. Any stubborn rust spots can easily be dispatched with muriatic acid. Try to work as quickly as you can and rinse often. Brushing and washing with the mixture of Westley's and ammonia and water will neutralize the acid and do the final cleaning. Blow dry and let stand out in the sun afterwards or wait till you wife goes shopping and stick it in the oven at 170 degrees. If necessary go over the cleaned chassis with metal polish and wash again. Should look pretty good now no matter how rough it was before. Wipe it down with WD40 on a cloth to prevent rusting again and you will be ready to start recapping. Don't forget the resistors.
 
Greg






-----Original Message-----
From: Jeff <vortex6066 at yahoo.com.au>
To: hallicrafters at mailman.qth.net
Sent: Thu, Jul 8, 2010 8:00 pm
Subject: [Hallicrafters] Cleaning a dirty rusty SX-28 chassis?


Hi,
an anyone suggest a procedure for cleaning up the upper side of an SX-28 
hassis which is in poor condition. It is quite badly spotted with a dark grey 
peckle and surface rust splotches. 
ont know what to do first in getting it to look better in terms of removing 
rime, speckle and killing rust.
ould I use some sort of mini abrasive powered cheaning wheel on it in addition 
o rust killer?
hanks,
EFF
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