[Heathkit] SB-620 Trace Problems

Carl Lowry l_carlj at bellsouth.net
Sun Jul 17 22:02:06 EDT 2005


My SB-610 is working "Perfect" thanks to all the helpers here ... boy whata difference from when it started...

Been working on a SB-620 past week which only displays the Righthand side of the CRT Trace line.
I cannot move the trace line to the left of the center.
The unit was a real junker when i got it & wasn't working at all.
All the tubes lite up now & are good.
I have replace the seleniums  with 1N4007s as has been suggested previously in my SB-610.
Have replaced the resistors with 1 watters around the Intensity & focus pots.
Yes I found several resistors which were burnt & bad... & have been replaced with 1 watters.
Have replaced all electrolytics with higher voltage ones.
Have replaced a "real bunch" of .02mfd caps which were either with broken leads or split into ... with "Orange Drops".
Have gone over my voltages at tube V6 which deals with the Horizonal Gain.
The Horizonal Gain pot appears to be good.
The CRT is good & gives a bright well focused "half" trace.
Have also gone over other voltages in the schematic & some voltage points appear off ... say 10-15 volts.. no biggie.
What am i overlooking please ?
Thanks again guys..
Carl , k4zrd


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