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Its filled with 2 Sovtek 6550's, 3 EHX 12AX7's and a nos GE 12AT7. I love this sound and have virtually zero breakup which I like in a bass amp.
I generally plug into the first channel, input one.
Its sitting ontop of one of my guitar cabs but sounds great through my 18" 8ohm cab for bass. I WANT to use it with a 4 ohm 2x15 cab but have been hesitant to do so given that I just paid for the retube, tune up and maintenance. It wasn't cheap.
So do you guys think its really alright to run this with a 4 ohm cab given that its rated @ 5 ohms?![]()
Sounds like a good choice of tubes to me. It is safe to run this head at 4ohms, my amp tech, who is also a TB member, confirmed this. I bet this head will sound good with 2x15's
Thanks!By the by, a coworker of mine used to teach guitar lessons in the store that these were developed/constructed here in Phoenix.
Good news indeed!Thanks!
I had 2 JJ ECC83-S in there and my tech said those were prone to failure given the spiral filament design (-S = Spiral in the model name) and he recommended the ehx as the bullet proof bass tone preamp tube.
I have little doubt the AIMS will sound good through some 15's. I used to play with a guy that had the AIMS PA head running through a Univox 2x15. It sounded really incredible as a bass amp.
I use either a Crate or a Sunn 2x15 cab (both are 4 ohms).
The Crate is my go-to cab live as it seems to love all amps and all venues equally. Best $100.00 I ever spent on bass gear, hands down.![]()
Hey cool, was that at Ziggy's music store here in Phoenix?
I believe it was
Univox 2x15?
Like this?
Link Removed
NO, but that Acoustic build-a-like is super sexy.
His Univox 2x15 was actually like the smaller sunn 2x15.

Here's some pics of an Aims P/A I thought you you guys might like:
(vertical stack dude)
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Just a word of caution for my peace of mind: to get 120W out of a pair of 6550s the B+ is going to be in the range of 6-700V. Be very careful if you open the amp up. That level of voltage will easily kill.