On Fri, 18 Jan 2013 16:36:30 -0500, "tm"
wrote:


"John Fields" wrote in message
.. .
Hello,

I have a Tektronix 465 which is perfect in every way except that the
horizontal trigger has gone belly up and the trace free-runs no matter
what.

Clue, please?

Thanks,

--
JF


Bad tunnel diode?

Do you have the service manual?

http://bama.edebris.com/manuals/tek/465(2)/

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Yes
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Can you trigger the B sweep?

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Yes.

--
JF