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Old 3rd Jul 2013, 11:56 pm   #55
maninashed
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Join Date: May 2011
Location: Preston, Lancashire UK
Posts: 955
Default Re: Tektronix 465B Scope - Some problems.

Good idea Leon, but if you are going to do this, be very careful in removing the crt connections to the x and y plates.

It may also be worth checking this: a while ago I had a very similar problem causing blurred trace and distorted spot, and this was the solution I posted on Tek usergroup:-

I had narrowed the fault down to the A/B sweep generator circuitry and checking
the voltages around that circuit revealed +29v on the collector of Q1096, when
it should be about 13v, I substituted Q1096 with an alternative with no
improvement. The voltages around Q1090 were also incorrect and it appeared this
N-channel jfet was faulty.I didnt have a direct replacement, but one from a
scrap board from British scope cured the fault and restored correct operation. I
dont know why this transistor had failed but it had, causing major problems on
both timebases.

Dave,you have the 465 manual, find that fet, and find its cousin in the 465B, you may just be lucky!

Bill

Last edited by maninashed; 3rd Jul 2013 at 11:58 pm. Reason: grammar
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