[Heath] HO 10 scope question (Update)

[pmarkavage at juno.com]

While it takes some time, 30 seconds to a minute, to get a trace, 10 to
15 minutes is much too long. CRT may be going bad, or there might be HV
issues. Check the various high voltages to see if there is creepage from
low to high. The most common problem with these things are the HV caps
and resistors that have moved value well beyond their tolerance rating.

Pete, wa2cwa


On Tue, 12 Jul 2011 07:28:48 -0700 (PDT) "K5MLC \(Mike\)"
<k5mlc at sbcglobal.net> writes:
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. 
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