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    Guitar Ranch

    2.9 (9 reviews)
    Closed 11:00 am - 7:00 pm

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    Ann Arbor Amplifier

    Ann Arbor Amplifier

    2.9
    (7 reviews)

    This review is based only on my experience with Frank's repair. Be warned…read more I built a tube amplifier from a Mojotone kit and despite triple checking all assembly steps when I fired it up (unplugged) was created with very loud buzzing which increased in volume with increase in amp gain controls. After frustrating review of every assembly step and verification that there were no cold solder joints or bad grounds I gave up and decided to have trouble shooting done by a certified amp tech. Frank is an elderly gentleman who works out of a very poorly lit and cluttered small apartment. I should have known better but I was anxious to get my project up and running. Now Frank's terms are $100 minimum and repair work not to exceed $150 without owner permission. Seemed fair so I handed over $100. Six days later Fank advised the amp was repaired with a balance owed of $200. The rationale was that he spent six hours totally rewiring the amp at $50/hour. He never advised me that the repair would in fact exceed the $150 "not to exceed" stated in my order. Nor did I ever ask Frank to undo all of my work and re-wire it. All I requested was for him to troubleshoot it and correct the issue. He does not have an oscilloscope so another red flag that should have had me running for the hills. It's my belief that Frank could not diagnose the problem so he decided to re-wire the whole thing. A good amp tech should have been able to pinpoint the cause of the buzzing without going to the extreme of rewiring everything. When I arrived at his apartment to check out the repair I plugged in a guitar and immediately noted that the loud buzzing was gone but there was a very noticeable hum which got louder with increase in amp gain. Frank said "oh it wasn't doing that when I checked it out". I unplugged the guitar and hum remained. Frank implied it was normal and I should expect that at high gain with a vintage tube amp circuit. I question Frank about the $300 charge without my consent and he said because he has sent me a text with a picture of the work in progress that should have sufficed as my approval since I did not say stop. I paid him the additional $200 thinking that the hum was perhaps environmental electro magnetic interference. I got the amp chassis home and installed it in the cabinet but the objectionable hum did not go away. I contact Monotone tech support and they advised that a properly built kit is dead quiet except for maybe some tube hiss at max gain settings. Frank's paperwork stated that the repair had a thirty day warranty. When I called him out on this he refused to do any further work on my amp and he said the he got it working and he was not about to but any more unpaid repair time in it. He said "you gave me an amp that had no output, it works now and hum was not the issue. It's your project, welcome to the world of electronics. Figure it out buddy" I decided to troubleshoot the hum. I discovered a cold solder joint connected to pre-amp tube V1 and that Frank had mis-wired the center tap from the power transformer. I removed that wire from the wrong location on the circuit board and soldered it in its correct location. Hum gone. Amp dead quiet even at max gain settings. I highly recommend that you think twice about using Ann Arbor Amplifier for amp repair.

    I had a customer that bought a custom tube amp from me. He had me ship it cross country to him. I'm…read moreon the West Coast. He's in Michigan. This is a big, heavy unit. He loved it but suddenly it stopped working. What to do? Shipping is expensive and hazardous. I found Bartsonics on Craigslist a few blocks from the customer. A local to check it out, perfect! The customer had told me that the only repair place there quoted him a six month wait to even look at the amp. He didn't know about Bartsonics. The next day, yes, the next day, not six months later, Bartsonics had checked the unit out and a verdict was in. The amp was perfect. No issues at all. The customer was the issue. That solved it for me. If not for Bartsonics I was on the hook for everything, big return shipping, whatever, it was on me. As it was, I was in the clear. They saved me. Thank you Bartsonics.

    Guitar Ranch - guitarstores - Updated August 2026

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