hot scope leads?

Hi

I was using my new oscilloscope to look at the heater (6.3v) AC signal
in a simple 12AX7 into a 6V6 SE design guitar amp.

Next thing I know I can smell buring and the ground lead of the probe
is starting to melt.

I turn everything off and barely salvage the scope lead (the ground
lead plastic coating almost melted off, but the main part of the scope
was ok)

I had the scope probe connected like this:

Probe (+ve end) on one side of the 6.3v winding and the ground lead
(-ve end) on the other side of the 6.3v winding.

Anyone know why it would have gotten so hot?

Perhaps I am using it incorrectly.

I am now scared to use it in case I melt or blow it up.

Any help would be appreciated.

Rchtop

.

Relevant Pages

  • Re: An OT oscilloscope question
    ... don't want current flowing in the ground lead or you will burn up ... doing you should not float the scope or alternator and obviously ... Next is to use a 10x or 100x probe and connect it to the alternator ... This will allow you to check one leg. ...
    (rec.crafts.metalworking)
  • Re: hot scope leads?
    ... in a simple 12AX7 into a 6V6 SE design guitar amp. ... Next thing I know I can smell buring and the ground lead of the probe ... I turn everything off and barely salvage the scope lead (the ground ...
    (rec.audio.tubes)
  • Re: hot scope leads?
    ... Next thing I know I can smell buring and the ground lead of the probe ... I turn everything off and barely salvage the scope lead (the ground ... Probe on one side of the 6.3v winding and the ground lead ...
    (rec.audio.tubes)
  • Re: hot scope leads?
    ... EJP wrote: ... Probe on one side of the 6.3v winding and the ground lead ...
    (rec.audio.tubes)
  • Re: hot scope leads?
    ... RchTop wrote: ... Probe on one side of the 6.3v winding and the ground lead ...
    (rec.audio.tubes)