[Boatanchors] Heathkit HO-10 Sweep (???) Problem

[Peter Markavage]

Every HO-10 that I've owned or seen in action, has had a wavy horizontal
line even with no input. Shielding of the cathode ray tube will sometimes
reduce it, and even some component reorientation will help, but I've
never seen it completely eliminated. And, I still have the one I built,
and the wavy horizontal line was there from first turn-on.

Pete, wa2cwa

On Sun, 26 Mar 2006 17:51:51 -0500 wd0x at adelphia.net writes:
> I'm hoping there is a simple solution to a sweep problem (at least I 
> think it's a sweep issue) I'm having with my newly restored Heathkit 
> HO-10 monitor scope. 
> 
> I've completely re-capped all of the paper & electrolytics, 
> re-tubed, cleaned and treated pot and switch contacts with DeOxit, 
> and still can't get a steady trace on the CRT with no input to the 
> scope. 
> 
> The horizontal sweep control will adjust the "wavy" line trace I get 
> and will eventually speed it up to the point where it is steady (but 
> a bit fuzzy) when the control is full clockwise. 
> 
> With the sweep control full CCW, I get a very sharp trace but it 
> resembles a sine wave NOT a perfectly flat line.  It is difficult to 
> get the trace to stop "moving" unless the control is full clockwise. 
> 
> 
> When I transmit a steady CW carrier into the scope, the top and 
> bottom of the display are "wavy" NOT flat like I think it should be. 
> 
> 
> Any suggestions as to where to look would be appreciated. 73, Bill, 
> wd0x