Here's an easy mod I did on my First Act M104 amplifier. I installed two 9-volt battery clips from Radio Shack, using existing screws. Didn't even have to drill anything. A good battery goes in one clip and powers the amp, and a spare battery goes in the other clip. The amp's specs call for 14 volts, but mine runs fine on 9 volts.

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Comment by Mike Bingham on July 23, 2013 at 5:02pm

Hi Gene, I thought I replied to this but must have failed somehow. I don't know how long the battery will last as I haven't played it enough to find out. It's plenty loud for a practice amp in the music room or basement workshop. One thing I do with it is use it as a signal tracer during troubleshooting and it really works well for that. Sorry for the delay in getting back to you.

Comment by Gene Sears on April 22, 2013 at 9:59am

Hey Mike, how long does it run on that 9v? Any volume issues?

Thanks!

Comment by Mike Bingham on July 9, 2011 at 6:00pm
Good deal, Hal.  These are really decent amps for the money.  I bought a Cohiba cigar box last fall and built a guitar out of it.  I took it and this amp back to the flea market where I got the Cohiba box and played it for the guy who sold me the box.  It drew a decent sized crowd before I got finished up,  Let me know how yours works.  See Ya!
Comment by Habanera Hal on July 9, 2011 at 10:31am
Excellent idea!  I have two of these amps and am going  to try this!
Comment by Mike Bingham on July 9, 2011 at 4:24am
Hi Uncle John - I'd almost bet that 18 v would work.  There was another amp like this one at the thrift store the other day.  It didn't have a power supply and I bought it for ten bucks. I might try two batteries on it one day just to see what happens. See ya!
Comment by Uncle John on July 9, 2011 at 2:37am
Good idea, Mike.  I wonder what to batteries (18V) would do.  Louder or blow the it up?

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