[Hallicrafters] Re: Hallicrafters Digest, Vol 27, Issue 28

[Wormchile at aol.com]

Terry B's questions of April 21 concerning contact cleaning revived some  old 
memories. When working with computers during the late 1960's - early 1970's  
we often cured their random gliches by removing their circuit boards, which 
were  secured by edge connectors,  and working over the contact strips on the  
board with good old-fashioned Pink Pearl office erasers. This technique was  
effective for removing films and airborne grime that could inhibit the 5 volt  
logic levels used in that type of equipment. I have also used other pencil  
erasers to good effect together with careful use of an ink eraser for more  
stubborn films. In extreme instances I feel that very fine sandpaper, such as  
modeler's sanding sticks, should work well for very dirty contacts if used with  
care. Do not, under any circumstances, use emery paper or polishing paper since 
 these products will remove metal, and the resulting loose particles can 
raise  all manner of havoc when turned loose in electronic circuits.

On  another topic, not necessarily Hallicrafters related, I recently acquire 
a  Harvey-Wells Bandmasre Z-Match antenna tuner at a barn sale. This tuner is  
supposed to handle transmitter inputs up to 500 watts. However, since we only 
 get what we pay for, the unit appears to be missing a 340 pf tuning 
capacitor.  This capacitor is one of two used to tune the unit and is mounted isolated 
from  ground. If anyone out there in Halli-land could point me in the 
direction of a  replacement for my missing capacitor I would be most  appreciative.  
Thanks for any help,

73
Jim  Mandelik, KD8AKJ