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Midrange mod on TA-15

Posted: Thu Mar 15, 2012 9:06 pm
by talltxguy
I checked out a new Mesa tech in Austin today - Anthony at the Audio Monk. He recently got "accredited" by Mesa and is on their website.

I took in my TA-15 and discussed how I'm always using an EQ to make up for the stiff mids that I'm fighting, particularly on the clean and light gain stuff. Apparently, the 34k resistor is the culprit. He's gonna put a little toggle switch to go between 100 ohms and 32k, and he's gonna do something to the treble circuit to add more range to it. And he's gonna try to mount the choke to the chassis instead of having it attached to the inside of the cover.

He's a nice guy who is enthusiastic about tone. Hopefully, his work and prices will be as good as my first impression of him. :)

Re: Midrange mod on TA-15

Posted: Wed Mar 21, 2012 3:35 pm
by talltxguy
Pretty quick turnaround time as the tech finished the midrange mod (2 position toggle which are settings below the stock resistor) and mounted the choke on the chassis for me. He also increased the range of the treble a bit.

Unfortunately, I cannot pick the amp up until next Friday because I'm bogged down with work. :(

Re: Midrange mod on TA-15

Posted: Fri Mar 23, 2012 11:32 am
by KH Guitar Freak
Hmmm. Have you asked him if it was ever possible to mount a mid pot on the back of the amp to simulate a traditional midrange knob???

Re: Midrange mod on TA-15

Posted: Fri Mar 23, 2012 12:42 pm
by talltxguy
He did ask if I wanted to go with a mid knob. After thinking about it, I decided to go with a toggle switch because of simplicity.

I rarely messed with the mid knob on the other Boogies I've owned. In fact, I seem to really only have 2 settings for mids - mildly scooped or really scooped. :)

Boogies are a bit tougher for me to dial in than other amps, so I'm trying to keep things as simple as possible with regard to tone controls.

Re: Midrange mod on TA-15

Posted: Fri Mar 30, 2012 11:34 am
by talltxguy
The difference between the two "mid modes" is subtle but noticable; and I feel like both modes are much better than the stock. I tend to use the scooped setting for clean stuff and the somewhat scooped setting for distorted stuff.

He also mounted the choke, which is cool, because I can now remove the top of the amp. :lol:

I'll post pics in a bit.

Re: Midrange mod on TA-15

Posted: Sun Apr 01, 2012 8:40 pm
by talltxguy
I prefer the choke mounted on the chassis. And he did a nice job of adding the toggle switch. 8)

Image

Re: Midrange mod on TA-15

Posted: Tue Apr 04, 2017 8:39 am
by pascalis_v
Hi talltxguy,

could you please repost the picture, and explain a bit more about the mod? (e.g. which resistor it is? or there is only one 34k resistor so it is easy to find?)

Many thanks!

Re: Midrange mod on TA-15

Posted: Sun Dec 31, 2017 12:19 pm
by talltxguy
I got rid of the TA-15. Missed it and picked another one up a while back but had to part with it for $ reasons. It's a great little amp for sure. One of my favorite Mesas.

Re: Midrange mod on TA-15

Posted: Tue Apr 10, 2018 11:20 am
by Dr. Tweedbucket
I liked mine so much that I picked up another one just for a backup. I put some NOS !2AX7s and EL84s in the first one and wow, what a crazy great difference!!

Re: Midrange mod on TA-15

Posted: Sat May 26, 2018 7:23 pm
by talltxguy
The Mesa amps I've had have responded well to NOS tubes. 8)