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Vintage threads from the first ten years

Boogie Studio .22 +

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10/22/1999 1:32 PM
Nils	Boogie Studio .22 + Hi, Does anyone have any tips on modding this amp. Maybe something for Mr Ayan Nils

10/22/1999 2:58 PM

I've got the PERFECT mod.....

This mod just occured to me a few weeks ago. Ya know
how in rhythm mode, you can have the preamp on 10 and
it barely distorts? On top of that, the distortion
(what little there is) is very gritty and unpleasant!

Well, simply disconnect the negative feedback. This
turn the amp into more of a non-master volume sounding
amp. The rhythm channel now start to distort around
5. And it make going from rythm to lead channels somewhat useful, now.

Mook

11/1/1999 9:57 PM
Nils	Mook, Sorry for the delay in responding I was awaiting the schematic, and now that I've got it can you try and explain to me how the PI can function properly without the NFB. I don't understand how the PI is working Nils

11/1/1999 9:57 PM
Nils	Mook, Sorry for the delay in responding I was awaiting the schematic, and now that I've got it can you try and explain to me how the PI can function properly without the NFB. I don't understand how the PI is working Nils

10/22/1999 3:38 PM
Gil Ayan	Sorry, Nils. Although I've owned a couple of Boogies in my lifetime (Marks I, IIC+, III and IV), I really only kept the ICC+ for a couple of years (now gone), and I have pretty much always had a Mark I (and this one has been extensively modded). I never even played a Studio 22+, so I have no idea of what it is that I wouldn't like about that amp, let alone how to mod it. :/ Gil

10/22/1999 4:04 PM

Some mods:

1) Use a 12AT7 or 12AU7 for the "lead mode" tube (the one with both sections in parallel) for less gain. The lead mode becomes much more usable.

2) Install a pot or trimpot so that you can adjust the lead gain independently from the rythm gain. You may want to look at the "Subway" schematic to get the idea...

3) Mod the FX loop to parallel - again have a look at the Subway.

4) If the amp has not a built-in graphic EQ, put one in the FX loop - it definetely helps to get rid of the excess of buzz.

10/22/1999 4:42 PM

quote:
"2) Install a pot or trimpot so that you can adjust the lead gain independently from the rythm gain. You may want to look at the "Subway" schematic to get the idea..."

There is a Mesa sanctioned mod that does something close to that. The "Lead Drive mod". It does not give the Lead mode a totally independent control -- it still is dependent on where the normal "Volume" control is set.
Basically you replace a 470k resistor with a 500k pot; and there may be a little more, although I can't recall off the top of my head right now.
What it offers is that if you like the clean mode with the "Volume" control up, but don't care for that much gain in Lead mode, you can adjust the Lead mode to lower gain settings without compromising the clean mode.
I have some notes on it somewhere, so if you're interested let me know.

-Dave M.

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