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Post subject: question for the Pro Jr owners
Posted: Thu Jan 07, 2010 7:05 am
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Aspiring Musician
Aspiring Musician

Joined: Mon Jul 16, 2007 9:58 pm
Posts: 387
just to reiterate, i recently bought a Pro Jr a few months back, so i'm a rookie with this amp.

i can't help thinking about the fact that the chassis is all closed up with no ventilation. i realize there are other amps that also have no vents to the chassis, but it seems idiotic to leave out such a minor yet valuable detail. especially on a little combo like this. you got all that heat going up from the tubes into the chassis, and now that heat has nowhere to go, and just kinda stews inside the box, all around the board and such.

i assume some of you guys have been playing the Pro Jr for awhile, so what are your experiences with the tube heat? have you had any problems inside the chassis because of prolonged heat exposure and lack of ventilation?
(consider the fact that i rehearse with it once, sometimes twice, a week, and i will soon be gigging with it 2 or 3 times a month. also consider that it is powered on for 2-3 hours at a time, maybe closer to 4 hours on some gigs.)


i've been toying around with some ideas to ventilate the chassis, but the clincher is that i dont want to modify the amp in an irreversible way, which would void my mfr. warranty. i figure its not worth doing that, because if something serious goes wrong, such as even heat-related issues, i still have a shot at product coverage. i know the easiest thing would be to just cut into the back panel and install a vent, or i could possibly drill into the top side of the chassis (though there isn't much room for that on this amp), but there goes the warranty out the door.

i do have a couple nice ideas that wouldn't affect the warranty, but this ties back into my main question. would it be worth my time and effort doing anything? or will it be perfectly fine as is? i just don't want to run into problems later on because of something i could have avoided.
some people say they use small desk/PC fans, which i suppose isn't a bad idea, but i worry about that causing problems due to significant shifting temperatures within the tubes. but again, is it even worth my worrying over it?

anyway, i'd like to hear your experiences. thanks.


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Post subject:
Posted: Thu Jan 07, 2010 7:40 am
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Aspiring Musician
Aspiring Musician

Joined: Mon Jul 16, 2007 9:58 pm
Posts: 387
thanks for the insight. you may be right about the convection effect, didnt think of that.

about using a fan, i wonder if applying it in the reverse sense would work as well, or better. i mean putting a fan in front of the hole in the back panel, but face the back of the fan toward the amp so that it is pulling the hot air out of the amp. if i were to get a fan, id probably try that.

but anyway, i know, many amps have survived without it. i have a history of asking many questions.


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Posted: Thu Jan 07, 2010 7:43 am
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Professional Musician
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Joined: Mon Dec 21, 2009 8:16 am
Posts: 1171
Location: Rutland, Vermont
I've not much experience with amps, but I have repaired many a computer that has had a power supply hosed from cigarette smoke. I would be more concerned with the fan moving more of that junk into the electronics while gigging than any heat issues.

8)


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Posted: Fri Jan 08, 2010 8:34 pm
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Aspiring Musician
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Joined: Fri Dec 05, 2008 8:20 am
Posts: 341
I agree with bbrodie. I have a PJ that I purchased about two years ago. It was used when I got it and I think it was produced in 1996 (it is the USA made tweed version). So, it is 14 years old and still kicking. I haven't had to do anything to it so far. I just keep the cover on it when its not in use and it seems to be fine (though I did realize tonight that one of the tubes might be going...microphonic-sounding).

I love this amp! Simple and straight forward tube tones - you can't beat it!

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Fender Pro Jr. (Tweed)
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