Mark V 90w Midboost

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Markageddon
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Mark V 90w Midboost

Post by Markageddon » Tue Apr 30, 2019 5:58 pm

Just wondering if such a mod could be devised:

To recreate the Mid/Boost feature from the V:25 and the V:35 on the V:90..?

Is anybody on that? Could Authorised Mesa Comment possibly..?


Thanks.

:D
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Re: Mark V 90w Midboost

Post by APEMAN » Tue Apr 30, 2019 7:14 pm

Hey...
I could be wrong but isn't that not just a simple pot job?
My guess: you simply have to swap your 10kA against a 100kA.
:wink:

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Re: Mark V 90w Midboost

Post by Markageddon » Wed May 01, 2019 6:24 am

I don't know...would that be something that was 'Patent Applied For'..?
Also from the way that that Ive heard it described it as tapered pot where above 12, thats where the effect of this patented device or feature kicks in.
This tallies with experience. Its a definite effect of an even frequencied gain boost above 12 o'clock.

I slaved my V:25 into the power section of the V:90 and it was amazingly huge. I couldn't stop playing channel 1 crunch on the 25. And IIC+ was super heavy too but with the fluid/immediate response. I had the 25's master up to about 11 o'clock, and with the Mid/boost dial in play on crunch mode.
It was amazing. Dunno if the loop was colouring the slaving-produced tone or not, but it felt like a little high was smoothened. If I can get that level of gain and heavy out of the 90's Crunch mode and even channel 3, I'll be well chuffed. This thing was like my Mark III red stripe with pull deep and treble etc activated.
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Don
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Re: Mark V 90w Midboost

Post by Don » Wed May 01, 2019 7:35 am

I did this to a Princeton Reverb. In Fender amp with no mids pot you replace the 6.8k resistor on the bass pot with a 100k (or higher) pot. In amps with a 10k or 25k mids pot, just replace it with a 100k pot.

From 0-10k it's a regular Fender mids pot. Above 10k it begins to remove the tone stack from the circuit for a huge boost in gain. My PR could get really loud with this mod alone.

I'm not sure how Mesa could patent this. It's been done on amps for years. Allen amps calls it a "Raw" control.

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Re: Mark V 90w Midboost

Post by Markageddon » Wed May 01, 2019 7:43 am

Good enough for me.
Thank you gentlemen..

Will take that advice.
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Re: Mark V 90w Midboost

Post by Authorized Boogie » Wed May 01, 2019 11:20 am

Don wrote:
Wed May 01, 2019 7:35 am
I did this to a Princeton Reverb. In Fender amp with no mids pot you replace the 6.8k resistor on the bass pot with a 100k (or higher) pot. In amps with a 10k or 25k mids pot, just replace it with a 100k pot.

From 0-10k it's a regular Fender mids pot. Above 10k it begins to remove the tone stack from the circuit for a huge boost in gain. My PR could get really loud with this mod alone.

I'm not sure how Mesa could patent this. It's been done on amps for years. Allen amps calls it a "Raw" control.
There is indeed a Patent Applied For...and works completely different than what you've described. Its not possible to add it to a Mark V, and more than a simple pot change. Thanks
MESA/Boogie - Product Specialist/Customer Service - http://www.mesaboogie.com/support/index.html

Markageddon
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Re: Mark V 90w Midboost

Post by Markageddon » Wed May 01, 2019 5:13 pm

Ah. Ok. Thanks for the clearup/clarification, AB. Appreciated...!

And well done for inventing it. Bloody marvellous stuff.
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Re: Mark V 90w Midboost

Post by APEMAN » Wed May 01, 2019 6:03 pm

...maybe I finally have to learn how to read this schematics :|

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Don
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Re: Mark V 90w Midboost

Post by Don » Wed May 01, 2019 9:36 pm

Authorized Boogie wrote:
Wed May 01, 2019 11:20 am
Don wrote:
Wed May 01, 2019 7:35 am
I did this to a Princeton Reverb. In Fender amp with no mids pot you replace the 6.8k resistor on the bass pot with a 100k (or higher) pot. In amps with a 10k or 25k mids pot, just replace it with a 100k pot.

From 0-10k it's a regular Fender mids pot. Above 10k it begins to remove the tone stack from the circuit for a huge boost in gain. My PR could get really loud with this mod alone.

I'm not sure how Mesa could patent this. It's been done on amps for years. Allen amps calls it a "Raw" control.
There is indeed a Patent Applied For...and works completely different than what you've described. Its not possible to add it to a Mark V, and more than a simple pot change. Thanks
Thanks for the clarification. It's good to know!

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