First you need to know your filament voltage, you can get this from the schematic or service manual or measure it, be aware however that the filament voltage in some instances comes from a additional winding of your HV transformer and therefore the frequency can be quite high (several kHz) sencore has listings for several scope tubes in the little book that comes with your CR7000 and if its not in there inquire with sencore they might be able to help you out.
If you encounter the same tube over and over you might consider building a adapter, you can pull a CRT socket from a salvage unit and buy a universal adapter from sencore and piece both of them together.
Mark <Groups@...> wrote:
Hello all...
I have been a member here for awhile, but haven't had anything to say
constructive to any of the topics discussed, even though I use a large
number of HP instruments in my work. As such I kinda sit back and
learn from you folks. Several posts have made me able to maintain my
HP instruments...Thank you!
A recent discussion centered around the ability to rejuvenate scope
tubes in the 141T. I searched the files and found several related
posts. However, I wasn't able to find anything that talked about the
actual procedure to do the rejuvenation. When I left the general
service business I took along with me a Sencore CR7000 CRT tester and
rejuvenator, which I assume would work for this operation since
mention was made of a Sencore CR-70.
I do restoration of vintage audio equipment and I run across scope
tubes, in several of the high end tuners and audio monitors, that
clients' send in for restoration. Most, if not all, are very weak.
These units have the small, 2 and 3 inch CRTs.
Could anyone here lay out the procedure for rejuvenating an actual
scope tube. I do have several tech sheets for the tubes involved.
I would really appreciate a lesson on how to accomplish this feat.
Thanks folks...
Mark
Absolute Sound Labs
email: wilsonm@...
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