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 Post subject: Midrange mod on TA-15
PostPosted: Thu Mar 15, 2012 9:06 pm 
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Donating Member

Joined: Sun Jul 06, 2008 9:48 am
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Location: Central Texas
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. :)

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Last edited by talltxguy on Thu Jun 07, 2012 4:07 pm, edited 1 time in total.

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PostPosted: Wed Mar 21, 2012 3:35 pm 
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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. :(

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Mesa Boogie Studio Preamp
Marshall JMP-1 Preamp
FYD Twin Reverb Preamp
various pedals & effects
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YOUTUBE mesafanintexas


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PostPosted: Fri Mar 23, 2012 11:32 am 
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Single Recto

Joined: Mon Mar 09, 2009 5:16 am
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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???


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PostPosted: Fri Mar 23, 2012 12:42 pm 
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Location: Central Texas
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.

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2 Partscasters
Mesa Boogie Studio Preamp
Marshall JMP-1 Preamp
FYD Twin Reverb Preamp
various pedals & effects
Homemade tube power amp
1X12 Thiele w/ Celestion G12H30
YOUTUBE mesafanintexas


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PostPosted: Fri Mar 30, 2012 11:34 am 
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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.

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2 Partscasters
Mesa Boogie Studio Preamp
Marshall JMP-1 Preamp
FYD Twin Reverb Preamp
various pedals & effects
Homemade tube power amp
1X12 Thiele w/ Celestion G12H30
YOUTUBE mesafanintexas


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

Image

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2 Partscasters
Mesa Boogie Studio Preamp
Marshall JMP-1 Preamp
FYD Twin Reverb Preamp
various pedals & effects
Homemade tube power amp
1X12 Thiele w/ Celestion G12H30
YOUTUBE mesafanintexas


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PostPosted: Tue Apr 04, 2017 8:39 am 
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Bottle Rocket

Joined: Tue Apr 04, 2017 7:29 am
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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!


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