"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)/

Can you trigger the B sweep?