You'll need a soldering iron, low wattage preferable, solder, some solder wick, and a needle nosed pliers. DO NOT work on an amp that is plugged into the wall AC outlet and please DISCHARGE THE FILTER CAPS before commencing work.

You'll also need a Peavey Nashville 400 schematic/parts layout to do this mod (Peavey part # 81501040). Peavey is pretty good about providing this sort of literature. If they charge for it, the charge is minimal.

Parts List

Caps
.01uf
3.3uf Non Polarized
.1uf
.33uf/50 volt mylar

Resistors
33 ohm/1 watt
1.2K
33K

Metzger Reverb Mod for the Nashville 400

Driver Stage Mods

1). Change input cap (C36) from .015uf to .01uf

2). Solder a 33 ohm/1 watt resistor in series with a 3.3uf non-polarized cap. Put this assembly across (in parallel with) R57 (33 ohms). You may want to 'fix' these parts with a silicon compound so they don't move.

Reverb Recovery Stage Mods

3). Change blocking cap (C40) from .22uf to.1uf

4). Change resistor R61 from 1.5K to 1.2K

5). Change cap C39 from .47uf/50 volt electrolytic to .33uf/50 volt mylar

6). Change resistor R60 from 22K to 33K

That's it, you're done. Don't forget to gently re-tension that reverb molex connector when reassembling your amp.

Bob Metzger

[This message was edited by Bob Metzger on 24 March 2005 at 08:31 PM.]

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Playing For JESUS,LC. WILLIAMS U12,SHO-BUD PRO1,CARVIN TL60,GIBSON LES PAUL CUSTOM,YAMAHA L-10A ACOUSTIC,ROLAND JW-50 KEYBOARD,G&L AND BC RICH BASS'S

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Mullen, Royal Precision, D10, Gibson Console Grande D8, Peavey Nashville 112, Peavey Nashville 400.

[This message was edited by Jim Saunders on 27 March 2005 at 12:55 PM.]

No more difficult than the Miracle Audio mod or the Peavey Tone Enhancement mod for the same product (in fact, alot easier). Many NV 400 users have installed these mods themselves. All that is needed is competent soldering skills, the ability to follow easy instructions and the desire to improve your amp.

If you don't feel comfortable doing it yourself, print this out and take these instructions to your local, competent, and hopefully NV 400 experienced, amp tech.

Bob M.

[This message was edited by Bob Metzger on 27 March 2005 at 01:58 PM.]

Anyway, regards and sorry for the drift.

[This message was edited by Jon Light on 27 March 2005 at 03:25 PM.]

I've been here about five months, but back and forth to L.A. alot. Yes, I'm doing amps (and pedal steels) for people here and can be reached thru my posted email address.

I appreciate the drift and hope all is well with you (and your Deluxe Reverb),

Bob M.

[This message was edited by Bob Metzger on 27 March 2005 at 03:07 PM.]

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Playing For JESUS,LC. WILLIAMS U12,SHO-BUD PRO1,CARVIN TL60,GIBSON LES PAUL CUSTOM,YAMAHA L-10A ACOUSTIC,ROLAND JW-50 KEYBOARD,G&L AND BC RICH BASS'S

Bob M.

[This message was edited by Bob Metzger on 30 March 2005 at 06:31 AM.]

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Playing For JESUS,LC. WILLIAMS U12,SHO-BUD PRO1,CARVIN TL60,GIBSON LES PAUL CUSTOM,YAMAHA L-10A ACOUSTIC,ROLAND JW-50 KEYBOARD,G&L AND BC RICH BASS'S

quote:

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...don't sub in different values because you can't find the listed values. Your results will be less than satisfactory. Just dig deeper in your sourcing. The parts are out there...

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And you're keeping the source a secret because...

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I have no secrets; try Mouser, Newark, Digi-Key but not Radio Shack (they won't have the right values). I just don't want to tell folks which suppliers to buy from. I said that because some musician types aren't good at finding non-standard part values. If Abdul's Electronics on the corner doesn't have it, they give up. Call one of the major part houses.

Jack:

Some of the parts are decreased value from the stock parts, narrowing the low end of the reverbed signal. I tried many, many permutations and combinations over a long period of time, including testing their effectiveness on gigs. This mod, as it stands, comes closest to my goals. I recommend you try it as it is. Everyone who has believes it to be a major improvement not only for the reverb but for the overall tonality of the amp. If you only use half the ingredients, your souffle may not rise properly.

And, yes, you're correct concerning C41.

Jack, one of the universal complaints of Peavey's reverb is how far the reverb control must be advanced to get a proper amount of reverb. Many folks feel more comfortable with the Fender reverb gain structure, where a good amount of the reverb effect is present between 3 and 4 on the knob. That was one of my secondary goals of the project was to raise the drive and recovery amounts of effect. Some resistor changes were used with this goal in mind. People have responded positively to the new gain levels.The NV 400 reverb not only sounds like Fender reverb now; it also works approximately the same with the reverb control.