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

[Charles]

I must be the lucky one. Bought it on ebay about 4 yrs ago and the 
horizontal line is crisp and clean. Charles

----- Original Message ----- 
From: "Peter Markavage" <manualman at juno.com>
To: <boatanchors at mailman.qth.net>
Sent: Sunday, March 26, 2006 6:45 PM
Subject: Re: [Boatanchors] Heathkit HO-10 Sweep (???) Problem


> 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
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