🚀 go-pugleaf

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I have a really old tube amp that doesn't work anymore.  I originally got it out of my neighbors trash.  I was in a big wooden box with speakers and a turntable.  I brought it home and salvaged the amp.  It worked GREAT!  After using it for about a week I decided I would have to buy new speakers to get the most out of it.  This is where my trouble starts.  After hooking up the new speakers the amp blew a fuse...and keeps blowing them even if I put the old speakers back.  I suspect that the impedence of the

 new speakers was different and may have shorted out one of the parts in the amp.  
Does anyone know of a way to find the shorted part or a way to find out if that's the problem?  Also, is there a way to find out what impedence speakers I should use?  The old ones don't say but the new ones were 8 ohms.
This amp can handle 150 watts x 3 channels!  I don't have money for a new one and since I have a lot of test equipment at my disposal I would rather fix it myself.  Please Please help me, this amp sounded absolutely awesome.  Oh, I forgot to mention that I had all the tubes tested and they check out O.K.

If you can help please E-Mail me so you don't clutter up the net.  
Thank you so much for any help!!!

Milton Nasiopoulos      nasiom@rpi.edu