#, 06:52 AM Senior Member Join Date: Jan 2005 Location: Middle Tennessee Posts: 2,160 Rivera Fender Concert mods I finally opened up my Concert II and took out several of the caps bridging the preamp tubes, rearranged a few of the leads, and changed out a couple of tubes, and am very pleased with the results. I now actually like the overdrive (sounds like a Boogie), but the clean channel is not quite to my taste yet. If I can get the clean to sound like a blackface or tweed Fender and the overdrive into Dumble territory I'll quit. I know Dan Torres has a 'mod kit' out for this, but I'd rather not blow the $50, and it sounds like his mod is more drastic than I'd like anyway.

I really don't like the idea of one master volume for both channels. I also don't think the Jackson mod really does what I want either. I have the schematic but with the switching being somewhat complex I have a hard time following the signal through it in different modes, otherwise I'd make a stab at tweaking the preamp a bit more myself. Any suggestions? If anybody has a copy of either of the above mods they'd like to give some details on I'd be interested - maybe I can incorporate some of what they did. I also don't understand in this amp why Rivera in 2 places ties both sides of a 12AX7 together and runs signal through both as if its one gain stage - it seems he wastes a whole tube that way. (and he DOES waste half a preamp tube later) I know I was advised to leave the amp alone, but I'm an inverterate tinkerer and couldn't help myself.

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I now plan to try rearranging the overdrive preamp tube component values to more 'Dumblelike' specs and am considering using the unused half of tube to give one more gain stage in the overdrive mode. I'm also thinking I'll change most of the preamp to metal film resistors and solid core wire.

The problem I think I'll run into is that the amp is fairly complicated, and I'll probably run into noise and oscillation problems as I proceed. I might be better off to simply put the caps back in, sell it and buy a Two Rock or Fuchs later (but I'm also a cheapskate). Any thoughts?

__________________ Let that boy boogie woogie. A joke: Two dyslexics walk into a bra. I've owned five '82-'84 Concerts, and for whatever reason none of them really sounded the same. Two of them were sort of close and sounded just good.

Two of them sounded pretty bad, but in very different ways. And one of them sounded really good. All of them appeared to have been stock.

I kept one of the decent ones and one of the pretty bad ones and had them modified with the Dan Torres mods. The 'pretty bad' one has become my favorite amp, mostly because it was the first one to get all the mods. It's been my #1 amp for about 10 years now. I'm curious as to why these amps don't seem to maintain a consistent tone. Maybe one reason is simply the layout of the chassis? They are literally a 'mess of wires' inside, and I've heard amp techs speak of how a careful layout can often be the difference between good tone and great tone.

I don't really know, I'm just bringing up the point. I'm not a tech, and had someone else do my mods for me. But it has been a night and day experience between what my '82 Concert sounded like before and what it has sounded like after. For the record, first it got new filter caps, then the complete Torres mod, and finally a new speaker. And it's a totally different amp with amazing tone. I liked it so much that I decided to get the second one and do all the same mods.