I did a huge mistake, now I need help!!!

[GERPUD]

I'll make it clear right away: I did too many things at the same time and I did a dumb ass move.

After doing few mods in my amp, I turned the switch on with no tubes and no speakers....
The light was on for 1-2 seconds and then the fuse blew.
Now, with everything connected, the fuse keep blowing.
It a single ended amp. I read 258ohm on the primary of the OT with my meter and 0.5ohm on secondary.

My guess is that I blew the OT, but I need a confirmation.

Thanks

[mhartman]

Picture. Big, clear pictures are needed.

[bal704]

With no power tubes in, you should't be blowing a OT. You might check your mods for shorts etc.

[GERPUD]

So no tubes and no speaker shouldn't do any harm?

So I'll check my mods

[tubeswell]

Check your modding to ensure that you haven't inadvertently shorted anywhere on the B+ rail to any part of the ground return side of the circuit.

[GERPUD]

Is an electrolytic filtering cap plugged wrong way could be cause that problem?

[bal704]

It would help to know what the mods were.

[GERPUD]

I added a filtering stage before the OT.
47uF + choke.
I just say few seconds ago that I installed the cap backwards...

In theses situations, I tell myself that those who do nothing do not make mistakes, and that experience is the sum of our errors...

[martin manning]

Is an electrolytic filtering cap plugged wrong way could be cause that problem?

That'd do it.

[lord preset]

Is an electrolytic filtering cap plugged wrong way could be cause that problem?

That'd do it.

I've done that. One of many ways to let the smoke out.

I would like to say everyone here has done that too, but it probably isn't true.

[Jana]

I would never do anything like that! If I had done something like that, I would have a story to tell about how the end of the cap popped out and scared me so much that I jumped and made contact with the B+ rail and got the jolt of my life and then the amp fell off the cradle and broke a tube which was a very spectacular light show with the sparks and I remember seeing all this as I was falling off the stool I was sitting on. You can always tell when that happens to someone--they write run-on sentences. But I would never do that.

[Leo_Gnardo]

I would like to say everyone here has done that too, but it probably isn't true.

Sign me up, in a moment of distraction I've done that. Also had caps that were mismarked as to which end's which Never wrecked a transformer, but it does have a negative effect on a good mood, mostly due to Scottish genes: "crap, there's a cap I can't sell now. Money be gone."

[xtian]

Well, no one I know certainly maybe did not get a high voltage burn today from the fluorescent fixture he may or may not have been replacing the ballast in...

[Tone Lover]

Its amazing how stinky letting the smoke out of a PT would be. But I dont know anyone who would do that.
Bill

[matt h]

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