I have a IN-18 clock in a aluminum case called Klok K7 (a wonderful case) however after many years of service 4 out of the 6 tubes just went out (not blacked out but still clear) I disassembled the clock to see what's up? answer is! corrosion ,like some one had been dropping water in it for ten years, somehow the aluminum of the case reacted with the solder to become cottage cheese,print board, after cleaning off the gunk, through out both boards ,upper and lower,including some sanding of printed ,board copper and the soldering of some lost copper with tiny wire,point to point,still 4 out of 6 no light ,time to pull out the meter , so I had 170 volts still working ,and I had the 5 volts needed for the IC's,tested near the hv resistors no voltage on inspecting the three anodes there were no more thru holes to the other side of the board (eaten away forever)I sanded the copper print and added point to point wire and got the anodes back,now the 6 tubes lit and as a precaution changed the 74141 IC's(they must have had a hard time ,replaced)but still a bit wonkey,i pulled the IN-18 tubes to look under neath , a whole bunch more cottage cheese rot,running pin to pin among the sockets (that's conductive crap on glass going pin to pin)(,more sanding,cleaning of the tubes them selfs,tested ,passed, test OK,clock restored, last bit, i sprayed plastic on both boards )covering the pins and sockets with tape before i sprayed them with plastic, in hopes it will arest the crud,and it will not form again so after many years this came out of no where (and if you also have a K7 you might check to see if it is OK or rotting before your eyes) thanx the davester westdave
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