3 Channel Recto Presence Mod....

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fluff191
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3 Channel Recto Presence Mod....

Post by fluff191 » Fri May 22, 2009 6:54 pm

I just modified the Presence pot on the Red channel of my 3 Channel Recto. And while I was at it, I thought I would take a few pics and share a simple How-To on it. Apologies for the cell phone pictures.

1. Remove chassis from headshell via the 4 bolts on the underside of the shell. Its best to remove at least the power tubes and the rectifier tubes so when you flip it over, there is no wieght on the tubes themselves.

2. Locate the potentiometer (will be on your right side when chasis is upside down and front is facing you)

Image

In this shot you can see it a little better....(the bottom pot)
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3. Ready your replacement pot (Mesa 25k Pot #593737; $1.75)
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4. Simply un-solder the 3 leads going to the pot. You can either unscrew the pot just above it or push its leads to the left and that should give you enough room for your soldering iron. I chose to cut the ends off and strip off some fresh wire for the new pot leads, but thats totally up to you.
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5. Simply re-solder the new pot to the correct leads (they all are in line with their correct terminals i.e. the wires do not cross over eachother).....
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6. Re-install pot without forgetting the small plastic spacer on the shaft (it prevents the chrome knob from rubbing on the chassis) and tighten knob with a 2mm Allen wrench.
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7. Enjoy.

So how does it sound? Incredible. Seriously. I found myself hating the Red channel because I could not seem to dial out certain high end frequencies even with the Presence all the way off. The stock rating for this pot is a whopping 100k, which in my opinion is way too much. The 25k is perfect and will give you a range closer to Channel 2.

The most expensive part was the shipping (surprise surprise) and in total the whole thing cost about $10 and about 20 minutes of time. So if you find yourself liking the Orange channel but wish it had the kick of the Red channel, try this simple mod. You will be very surprised at the difference.
Last edited by fluff191 on Wed May 27, 2009 4:52 pm, edited 4 times in total.
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Elpelotero
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Re: 3 Channel Recto Presence Mod....

Post by Elpelotero » Fri May 22, 2009 7:53 pm

Wow....I guess it's worth a comparison to what you got coming, ehh?
'92 Dual Recto Rev. D, Volume mod
'84 Mark IIC+ Coliseum
'85 Mark IIC++ DRG, V1 mod
Mesa Standard 4x12
1980's EV Thiele
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fluff191
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Re: 3 Channel Recto Presence Mod....

Post by fluff191 » Fri May 22, 2009 8:00 pm

haha oh there is going to be some serious A/Bing going in my house for sure!
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Re: 3 Channel Recto Presence Mod....

Post by lerxst88 » Mon May 25, 2009 1:14 am

great write up! i love reading detailed mods how-to's with lots of helpful pics!

Good job! :D
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fluff191
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Re: 3 Channel Recto Presence Mod....

Post by fluff191 » Mon May 25, 2009 1:15 am

Thank you!
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mikey383
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Re: 3 Channel Recto Presence Mod....

Post by mikey383 » Mon May 25, 2009 6:53 am

I think we need a Recto mod sticky.
Guitars:Schecter C-1 Classic, Ibanez RG7321, Epiphone LP Supreme
Amps:70's Earth head
Cabs:Recto 4x12, 5150 4x12
Effects:Digitech GSP2101, Budwah
Past amps '95 Dual Recto, '96 Dual Recto, Stiletto Trident, 3 ch. Triple Rec

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Re: 3 Channel Recto Presence Mod....

Post by Mr.Hetfield » Mon May 25, 2009 9:59 am

Wow. I think I want to try this once I get better wire the wire and gun. This stuff needs a sticky!

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Re: 3 Channel Recto Presence Mod....

Post by Chris McKinley » Mon May 25, 2009 1:44 pm

Excellent walkthrough, fluff. I second the motion to make it a sticky.

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fluff191
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Re: 3 Channel Recto Presence Mod....

Post by fluff191 » Mon May 25, 2009 5:49 pm

Thanks guys! A sticky for this and Mikey's Bias Mod would be awesome.
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mikey383
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Re: 3 Channel Recto Presence Mod....

Post by mikey383 » Mon May 25, 2009 5:56 pm

Speaking of the bias mod, have you got around to doing that, fluff?
Guitars:Schecter C-1 Classic, Ibanez RG7321, Epiphone LP Supreme
Amps:70's Earth head
Cabs:Recto 4x12, 5150 4x12
Effects:Digitech GSP2101, Budwah
Past amps '95 Dual Recto, '96 Dual Recto, Stiletto Trident, 3 ch. Triple Rec

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Re: 3 Channel Recto Presence Mod....

Post by fluff191 » Mon May 25, 2009 6:38 pm

No I didn't. My buddies Bias Rite took a dump. :(

Then right after that I bought a Rev. E Recto and was thinking about not doing the mod at all for re-sale purposes. But now I think I will just keep the 3 channel and do the mod when the Bias Rite arrives. I will just make it like a tie-in to your excellent How-To.
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mikey383
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Re: 3 Channel Recto Presence Mod....

Post by mikey383 » Mon May 25, 2009 6:53 pm

Hell yeah. Congrats on the Rev. E.

There's absolutely nothing wrong with having 2 Rectos either. I've been wanting to buy another one. I've been thinking about buying a 3 channel head again. If I can find a good deal on one, I just might do it.

BTW, you don't need a bias rite. A multi-meter will work just fine. Just follow the links in the thread, and there's some really good information on how to set bias. FWIW, if you're putting the bias pot on the inside, you're right there to measure the bias anyway. ;)
Guitars:Schecter C-1 Classic, Ibanez RG7321, Epiphone LP Supreme
Amps:70's Earth head
Cabs:Recto 4x12, 5150 4x12
Effects:Digitech GSP2101, Budwah
Past amps '95 Dual Recto, '96 Dual Recto, Stiletto Trident, 3 ch. Triple Rec

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fluff191
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Re: 3 Channel Recto Presence Mod....

Post by fluff191 » Mon May 25, 2009 7:02 pm

Holy hell! You are totally right! I think I might shoot for next weekend to do the mod.

And yeah I know have 2 Rectos and instantly thought "Gotta get rid of one" cause why have 2? But then I thought "Why not?" haha Save the newer one for gigs or something.
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Re: 3 Channel Recto Presence Mod....

Post by jdurso » Tue May 26, 2009 10:40 pm

awesome post fluff... i think your mod plus the other mod for channel 2 on the roadtser (basically replace all the pots to match the stiletto) would be awesome. You should also try some different NOS tubes in your phase inverter preamp slot. I found going with a mellower tube like a Mullard short plate to smooth things out without loosing the high end.
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Re: 3 Channel Recto Presence Mod....

Post by fluff191 » Tue May 26, 2009 10:46 pm

jdurso wrote:awesome post fluff... i think your mod plus the other mod for channel 2 on the roadtser (basically replace all the pots to match the stiletto) would be awesome. You should also try some different NOS tubes in your phase inverter preamp slot. I found going with a mellower tube like a Mullard short plate to smooth things out without loosing the high end.
I have thought about going down the NOS route, but simply do not know enough about what is good vs. what is bad to really feel comfortable buying anything, ya know? And does changing out the PI (V5?) really effect it that much? And if so how does it compare to changing out tubes in V1?

I am pretty happy with a set of JJ's in V1-V3 with stock Mesa for V4 & V5 with KT77's and GZ34's...
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