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PostPosted: Thu Apr 19, 2018 4:51 pm 
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Bottle Rocket

Joined: Fri May 19, 2017 5:43 pm
Posts: 13
I just got a Studio Preamp, with a set of almost new Mesa tubes (used 1 month).

I was really surprised that the lead channel is really "fizzy". The high end is reminiscent of fuzz box (still with some tube elegance...).
I tried very possible knobs settings, tube swapping, Effects Send output...

Only very low Lead drive settings can reduce the effect (Lead drive 1-2, input volume at 4-5)

Beside that, the preamp seems to perform as expected.
Just to be sure, I made a quick comparison with my Quad Preamp and my Triaxis, using the same amp/cab setting, and indeed, the "fuzz effect" was not there.

Is this the normal sound of the Studio Preamp Lead channel ? Or should I plug my soldering iron ? :mrgreen:

Thanks in advance !


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PostPosted: Thu May 24, 2018 10:06 pm 
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Bottle Rocket

Joined: Tue May 20, 2014 10:25 pm
Posts: 7
its not normal.

I have a Studio Pre and a Triaxis. When A/B testing though the same cab and guitar the sound produced is very similar (reference is using LD2 yellow on the Tri)

let us know what you find!


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PostPosted: Sat May 26, 2018 7:31 pm 
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Donating Member

Joined: Sun Jul 06, 2008 9:48 am
Posts: 641
Location: Central Texas
My Studio Pre is particular about settings and tubes.

If it's fuzzy, here are some suggestions that may help you out:
1) put a 5751s in V1, V2, and V3 to tame the gain
2) dial down the lead drive and volume
3) turn the EQ off
4) try some different pickups

Rock on,
Scott

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YOUTUBE: mesafanintexas


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PostPosted: Sun May 27, 2018 11:02 pm 
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Donating Member
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Joined: Mon Jan 24, 2005 10:36 pm
Posts: 1463
Location: DC Metro Area
Not sure if this is the case with you, but if you're running the "Volume" (akin to Volume 1) high, that could cause issues. The taper on that knob on the Studio is nuts. Running it around 4-5 is close to 9-10 on the Mark amps on some I've had. If you're running it at 8+, I could see it turning the tone to mush.

_________________
Boogie user of 20+ years, previous owner of 150+ Rectos, author of the previous "2 Channel Recto User Guide" and current "3 Channel Recto User Guide" (if I ever stop being lazy and finish it)...


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PostPosted: Sat Jun 09, 2018 1:56 pm 
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Mark II
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Joined: Tue Feb 26, 2008 2:23 am
Posts: 79
Location: West Chester, PA
pmx1 wrote:
I just got a Studio Preamp, with a set of almost new Mesa tubes (used 1 month).

I was really surprised that the lead channel is really "fizzy". The high end is reminiscent of fuzz box (still with some tube elegance...).
I tried very possible knobs settings, tube swapping, Effects Send output...

Only very low Lead drive settings can reduce the effect (Lead drive 1-2, input volume at 4-5)

Beside that, the preamp seems to perform as expected.
Just to be sure, I made a quick comparison with my Quad Preamp and my Triaxis, using the same amp/cab setting, and indeed, the "fuzz effect" was not there.

Is this the normal sound of the Studio Preamp Lead channel ? Or should I plug my soldering iron ? :mrgreen:

Thanks in advance !


Definitely not normal. When Ld Drive is set high (around 8ish) is the only time mine gets fizzy, but nothing I'd call abnormal.

If you're capable of working with high voltages, I'd do some signal tracing to find at what stage it starts to get gnarly. There's a SP schematic floating around the interwebs that is accurate.

_________________
Guitars:
Ibanez '98 RG7620 (EMG 81-7H, 60-7H)
Amps:
Triple Recto 3CH (modded), Studio Preamp (MK2C+ mods), 2x12 Recto Vertical cab
Past:
Mark V head, Rectoverb series 2 combo, F-30 combo, V-Twin rack pre


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