[Heath] HO 10 scope question (Update)

[Morris]

You must be too young to remember waiting on the defective CRT on the old
black and white TV to warm up so we could see a picture.   Sounds like the
CRT is the problem with reduced emission or a cathode short.  There was
available a special filament voltage booster that sometimes extended the
life of the old CRT but it was marginal in value IIRC.
 
 

Morris 

-----Original Message-----
From: heath-bounces at puck.nether.net [mailto:heath-bounces at puck.nether.net]
On Behalf Of K5MLC (Mike)
Sent: Tuesday, July 12, 2011 10:29 AM
To: cemilton at aol.com; w4gbw at bellsouth.net; heath at puck.nether.net
Subject: Re: [Heath] HO 10 scope question (Update)


Hello everyone,
 
Thanks for all the great ideas! Here is an update on the HO 10 scope
project: I opened her up and gave her a good look over, looking for obvious
burned stuff, loose stuff, etc. I unplugged the tubes and did a visual on
those, and returned them to their sockets. I measured the caps and resistors
and found nothing "way out," although several of the hv resistors are higher
in value and are on the "replace" list. I found nothing obviously damaged,
so I plugged her in and switched her on, again watching for anything
unusual.  The tubes lit up. I waited, but no trace on the CRT.  I decided to
let her remain on and "cook" a while ~ after 10-15 minutes - finally, here
came a trace!  I have repeated this scenario several times, and I have even
put her in the "loop" and monitored my signal FB.  
 
So, any ideas about what to replace to eliminate the "wait" time? All the
tubes are reasonably priced except the 6C10!  That one is pricey! (On, and
BTW, I do have the assembly manual and schematic.) 
 
Thanks for everyones assistance. 
 
Mike
 
Chuck, Hayseed has a recap kit listed for an HR 10, but not the HO 10.  But
it looks like they would assemble one for me if I requested it. Thanks for
the info. 



From: "cemilton at aol.com" <cemilton at aol.com>
To: w4gbw at bellsouth.net; k5mlc at sbcglobal.net; heath at puck.nether.net
Sent: Tuesday, July 5, 2011 6:56 PM
Subject: Re: [Heath] HO 10 scope question



Try   www.hayseedhamfest.com <http://www.hayseedhamfest.com/>         They
have a complete re-build kit for the scope.  
 
73
Chuck
W4MIL


Remember, the government cannot give anything to anyone that they have
not first taken away from someone else.



-----Original Message-----
From: Charles W. Morehouse <w4gbw at bellsouth.net>
To: K5MLC (Mike) <k5mlc at sbcglobal.net>; Heathkit <heath at puck.nether.net>
Sent: Tue, Jul 5, 2011 7:44 pm
Subject: Re: [Heath] HO 10 scope question


Hi Mike,
Yes, have restored a couple of them and others with the same circuit.
Replace the HIV caps and all the resistors in the HV circuit.
The electrolytics are unobtanium, but I cut off the base with a Dremmel tool
and install new caps inside.  Epoxy the can together.
Works great and keeps the look original.  Suspect the 1V2.  Makes a great
scope to monitor your stereo.  Good luck.
Wayne,
W4GBW
 
 
"Madam, we have given you a republic, if you can keep it."  Ben Franklin
 
 
 
 

----- Original Message ----- 
From: K5MLC (Mike) <mailto:k5mlc at sbcglobal.net>  
To: Heathkit <mailto:heath at puck.nether.net>  
Sent: Tuesday, July 05, 2011 4:14 PM
Subject: [Heath] HO 10 scope question

Hello,
 
After sitting unused for a while, my HO10 monitor scope appears to be dead.
It was working FB before being shelved.  As far as I know, it has never been
recapped.  Should I start there? Anyone have any other ideas/suggestions?? 
 
Thanks in advance.
 
Mike  K5MLC
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