#1
Just bought my first tube amp, Mesa Stiletto Ace 1x12, and I don't really know how to set it up. I'm assuming the pre-amp tubes are already installed because they weren't shipped separately, but as for the two EL34 an the 5U4 rectifier, which way should the tubes be facing when I install them? Or does it not matter?

edit: I got it used from Guitar Center, if that matters.
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Last edited by Danjo's Guitar at Jul 7, 2011,
#2
it is pretty rare for amps to come with the tubes not installed.

but if you do need to install the, there is a "guide key" to make sure they only fit one way. usually the slots they go into are labeled with which tube goes where.
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#3
Well the EL34's and the rectifier weren't installed. Alright, I guess I'll just put them in then....?
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#4
If the power and rectifier tubes weren't installed, I'd try to see if you can see the preamp tubes... it might suggest additional costs to buy preamp tubes separately.
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#5
line up the pins... they should only really go in one way
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#7
I've seen a few Mesas in the last year or so that came with the tubes uninstalled. Mesa had a practice of putting cheesecloth sleeves over their tubes inside the amps in order to protect them during shipping. If the buyer forgot to remove these sleeves before he or she fired up the amp, the result was burning cheesecloth, damaged tubes and a very unhappy customer. Perhaps this is why they decided to ship the amps with the tubes uninstalled?

As others have said, the arrangement of the pins dictates how the tube should fit in the socket. They should line up only one way, so don't worry about making a mistake. Do make sure all of the tubes are installed, though. Make sure there are no empty sockets inside the amp before you switch it on.

Have fun with it. You've got a very nice amplifier there.
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