TEK 465 Scope - Power Supply Voltages

I'm looking at the 465 and the 465B manual, and I don't see any of these low voltage supplies. The only unregulated outputs are +120V and the unregulated source for the +55V regulated output (actually +78V) and +15V unregulated. . There is a +110 regulated output, but no 95V output. Which version of the 465 do you have? (465/465A/465B)

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"DaveM" wrote in news:OfidncWUwYlOsUrYnZ2dnUVZ snipped-for-privacy@comcast.com:

It's a 465M,not truly a *465*. It's more like a 455A2B2 with wider BW.

The 32V-unreg runs the HV,he probably has a bad multiplier or CRT.

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Jim Yanik
jyanik
at
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Sorry,it is a 465M. Dale

If you have a HV-Probe, stick it on the Anode lead. I don't know what the HV is suppose to be on that unit how ever, the last one i looked at was aprox 12k. I had to replace a trippler in old MIll Spec scope made by Dumont years ago. i still have the scope at it works nicely.. 60 Mhz.. I ended up making a new trippler using the old case that was in there. because i too, left the scope on for a couple of days and came back to find the fuse blown out. I used a dermal tool to remove all the old contents. used some common HV diodes and got some caps together. soldered them together on a predilled board with no foil. laid it in the case, and used HV putty layers at a time with a heat gun to fill the majority of it. then top it off using silicone. It works perfect..

What i did to test it, i disconnected the HV coil lead going to the trippler. did a HV ac test from there.

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wrote in news:cJ_Bh.85192$ snipped-for-privacy@bgtnsc05-news.ops.worldnet.att.net:

disconnect the HV drive to the multiplier.The 95V should come up and the

32Vunreg fuse should not blow.

Do you have a 465M service manual?

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Jim Yanik
jyanik
at
kua.net

Thanks Jim. Yes, I have the manual on CD. Dale

Jim, I disconnected the HV drive at pin 10 of the transformer where it is connected to the HV multiplier. Fuse still blows. What next? Dale

This isn't the usual shorted tantalum cap problem? :)

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Sam Goldwasser wrote in news: snipped-for-privacy@minus.seas.upenn.edu:

Was that the wire from a post on the side of the multiplier to a separate post on the xfmr?

then the HV osc xstr is probably failed.

time to troubleshoot.

BTW,there's an excellent circuit description in the service manual that tells how the circuits work,I always referred back to them,I consider them invaluable.I hope they included it on your CDROM.

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Jim Yanik
jyanik
at
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"dale" wrote in news:ZCsCh.1340$XT.705@trnddc06:

Don't you think a shorted xstr would blow the 32Vunreg fuse?

FIRST,I suggest you READ THE CIRCUIT DESCRIPTION for the HV oscillator. Then you should know how to troubleshoot it. I'm not going to tell you "check this,then this ,then this".....ad infinitum.

I also do not have any TEK manuals to reference,I work from memory.

-- Jim Yanik jyanik at kua.net