Homebrew Drum Computer (magnetic heads)

[Jos Dreesen / Marian Capel]

>    The heads were fixed, on 6 pairs of mounting bars, with a critical 
> air gap between the head the drum surface.  

In the machines made in Gottingen the procedure was to a cigarette paper as a shim...

a machine made in the GDR seems to be the kind of machine the OP was thinking of :

http://rechentechnik.foerderverein-tsd.de/d4a/d4avortrag/img6.html

					

                                        Jos Dreesen