LGP-30 Memory Drum Update

Jon Elson elson at pico-systems.com
Wed Jan 4 12:06:06 CST 2017

On 01/04/2017 09:03 AM, Klemens Krause wrote:
>> We both have analog recordings (from digitizing scopes) 
>> and logic analyzer dumps. So concerning the LGP-30, all 
>> relevant information about the drum has been saved :-)
> We have a second LGP-30 drum in our museum. It is damaged 
> by water.
> (large rusted areas, probably from water between heads and 
> drum).
> I'm dreaming to wash the brown oxide coating off with a 
> solvent like
> acetone, polish the drum and repaint it.
> As magnetic paint I would try iron oxide from audio tapes 
> solved in acetone or some other solvent.
> Perhaps one could ask an airbrush artist to do this.
> Rumours say, that the drums originally also were coated 
> "by hand".
> Rewriting the timing tracks should not be impossible with 
> todays
> electronics.
> There is another guy here in germany, who has a LGP-30 
> with heavily
> corroded drum. That would be certainly interesting for him.
Previous messages suggested the LGP-30 drum was plated with 
nickel. If there are amateur astronomers with a vacuum 
evaporator, it might be possible to get them to adjust their 
setup slightly to vacuum evaporate nickel on your drum, 
after refinishing the base.  You'd need a rig to slowly turn 
the drum while evaporating the nickel. Some other research 
labs at universities might have the necessary equipment, 
also - check with the Physics department (or electrical 


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