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Re: Tube Distortion effect with real tubes??

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12/5/1999 9:23 PM

Re: Tube Distortion effect with real tubes??

How about making a clone of the old Alembic F2B preamp. It was produced about 20 years ago. It is basically a copy of a Fender blackface preamp. It originally was a stereo preamp, two identical preamps in a one rackspace unit. You could run a wire out of the left channel then into the right channel for some heavy distorted tones. BTW, it uses 12AX7A tubes.

12/5/1999 11:07 PM

quote:
"How about making a clone of the old Alembic F2B preamp"

Here's the Alembic" target="_blank">http://www.eden.com/~keen/alembpre.gif">Alembic schematic.

12/24/1999 2:37 AM
DavidB	arrgggg!can't find the alembic preamp schematic help

12/6/1999 12:36 PM

Dave & R.G.

There's no information on the transformer, but I assume that the B+ is high voltage. This looks like a simple circuit. For some reason, I got it in my head that a circuit like this is BETTER to be laid out on terminal strips (or turret board or eyelet board) than on PCB. I think if I built this one, I would do it in a rack enclosure on terminal strips, I could easily mod it to my heart's desire and I think overall would be easier to put together and maintain than using a PCB. Anybody else have any comments on my way of thinking?

JD

PS - I'd really like to build this one, but my list of projects to do is way too long at this time. Maybe I could do a layout, if anyone's interested.

12/6/1999 3:48 PM
Mike Burgundy	Re: Tube Distortion - more links The TD from Jacks site Works better on 12V as said, the opamp has a pretty big impact on the sound (produces most of the distortion), I prefer a 4558. I also have the production-tubedriver schem, but can't seem to upload it, darn... Matchless hotbox McTube and another nice little box The latter three run on high voltage.

12/6/1999 4:03 PM
R.G.	Re: Tube Distortion effect with real tubes?? Yep, it's a high voltage supply. Interestingly enough, the Alembic is powered by a standard part that Stancor still makes. I think it's the P8914, and it has enough B+ and filament to power a couple of 12A?7's. It's about $17 as I remember. Not a stock item, though, so you'll have to contact Stancor or get a distributor to order one.

12/7/1999 12:29 AM
BIG Dave	I ordered that transformer from Alembic many, many years ago when I intended on building an F2B clone. I never got around to it. The transformer is stamped NT5198 then 7-85 below. The primary has four wires; black, white, green, and orange. The secondary has five wires; two blue, two red, and one red/white. I think I remember Alembic charging me about twice that much!

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