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Post subject: 1966 BF Showman Blowing Fuses
Posted: Sun Jan 29, 2012 5:37 pm
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I have a 1966 Fender BF Showman AB763 that is blowing fuses. Here is the scenario. I’ve had this thing for almost 40 years. It always was finicky. I had to be careful not to push it too hard or the second tube from the left (looking at it from the rear) would torch the socket, arc the tube, and blow the fuse. As a result, I put it away for a LONG time and then have used it intermittently over the last 10 years or so with a Gibson EB-0. It was stored badly—heat, cold, humidity, etc., everything you don’t want to do.

So recently I dug it out and put new sockets in for the power tubes. I did not change the tubes (I had done so many years ago). Fired it up. It worked okay with my old Rick 360. Then my son plugged in his Flying V with a Blackstar HT-Dual pedal. We didn’t push it hard, but within 3 minutes the fuse blew. There may or may not be some arching on the second tube like the old days--I can't really tell.

My question is, any ideas what the problem(s) might be? The amp does need a cap job—no question about that. I have a fresh set of tubes, but I’m afraid to put them in until I get to the bottom of this. One further note, it has a 1X18 JBL speaker cabinet and the transformer is a 125P34A.

Thanks!
Larry


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Post subject: Re: 1966 BF Showman Blowing Fuses
Posted: Sun Jan 29, 2012 6:42 pm
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Prolly best to have a good amp tech go over the whole amp. Kinda like a 50,000 mile major tune-up. Could be several things amiss.


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Post subject: Re: 1966 BF Showman Blowing Fuses
Posted: Sun Jan 29, 2012 10:45 pm
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Joined: Fri Jun 26, 2009 6:53 pm
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Location: Harvard IL
Yeah rastir, Beemer has good advise. That V2 problem seems like it's drawing too much current. Hard to say what is happening in your amp, without a full inspection. Your amp is a very strong-solid designed piece, can't imagine the problem is much more than a bad component, socket, etc. It's just a matter of diagnostics. Sorry I can't offer a more substantial remedy. Art

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Last edited by aclempoppi on Mon Jan 30, 2012 10:21 pm, edited 1 time in total.

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Post subject: Re: 1966 BF Showman Blowing Fuses
Posted: Sun Jan 29, 2012 11:55 pm
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Posts: 1153
Location: South Bay, CA
I'm guessing whatever problem it had back then is still there or has gotten worse. Don't replace the tube socket without figuring out the actual problem first. Totally worth having a qualified tech go through and update:

filter caps
adding grounded 3-prong power cord and removing the death cap
replacing any resistors/caps that have failed or fallen out of tolerance.

As an example, mine was way worse off, but here's a picture guide of what I did to my '65 Showman:
http://gallery.me.com/nedorama/100506
username: timmy
pw: timmy

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