Adjusting tone change from installing BB chip mods on amps?

Jim Bates · From: Alvin, Texas, USA

This is NOT any criticism of the upgrade kits of BB chips for the Session 500 and Nashville 1000 which I did on both amps. Overall the amps sound much better, BUT both are much hotter in the treble and presence now. Question is can I remove some of the treble hotness by pulling out some of the BB chips in the tone circuit, and putting back my old chips in that part of circuit? Or, would that mess up everything else?

I'm currently playing a local opry in a 'Community center' building with cement floors and hard walls, so the treble is very bright.

Thanx,
Jim

Jack Stoner · From: Kansas City, MO

I did the op-amp change in the NV1000 I had and I didn't have to change anything on the EQ. Same way with a NV112 that I still have. This is on my Franklin with Lawrence 710 pickups.

But, if you have too much highs, readjust it to fit what you want.

You would have to change out the chips back to all the originals if you don't like them.

Richard Sinkler · From: aka: Rusty Strings -- Missoula, Montana

I had Ken do my NV400, and had no problems with adjusting tone (these were the chips he used before the opa2134 - I think that is the number) and I recently changed to the latest chips he recommended and also had no tone issues. Try playing with the controls before switching out the chips. know I have read on here that some upgraded and didn't like it and put the original chips back in.
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Carter D10 8p/8k, Dekley S10 3p/4k C6 setup,Regal RD40 Dobro, Recording King Professional Dobro, NV400, NV112,Ibanez Gio guitar, Epiphone SG Special (open D slide guitar) . Playing for 55 years and still counting.

Jim Bates · From: Alvin, Texas, USA

Yes, I can adjust the treble and presence to 9 or 8 o'clock and get sound close to what I had.

Will try tweaking the other shift and mids controls.

Thanx,
Jim

Lane Gray · From: Topeka, KS

Jim, at the risk of belaboring a point you might already know, it helps to remember the characteristics of what the knobs do.
Low/bass: warmth, but too hot and it turns "boomy."

Mid and shift work together to define the" flavor." With almost everything solid state, you'll have to cut the higher section a bit: typically run the mid between half past nine and 11 o'clock with the shift somewhere between 1 and half past 2.

Highs/treble: this adds "brightness," but can get annoying.

Presence: adds "shiny" or really puts an edge on it.

I'm not an electronics guru, but I'm inclined to think that, because no you need make no adjustments when swapping out the op amp chips, that you don't need to have all of them the same; you should be able to swap the High- and Presence-related chips back while leaving the others.
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2 pedal steels, a lapStrat, and an 8-string Dobro (and 3 ukes)
More amps than guitars, and not many effects

Jack Stoner · From: Kansas City, MO

I'll check my schematics later and post back, but from what I remember there is not one chip for each of the EQ controls.

Lane Gray · From: Topeka, KS

Hmmm. I woulda thought they'd set it up with a handful of band pass filters in parallel, boosting or cutting each of the respective ranges, then mixing them back together before going on to the power amp.
I guess that's what limited knowledge and a chunk of logic gets you.
If that's not what they do, how do they do it?
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2 pedal steels, a lapStrat, and an 8-string Dobro (and 3 ukes)
More amps than guitars, and not many effects

Jack Stoner · From: Kansas City, MO

Update.

The EQ circuitry in Peavey amps with the Paramid EQ are more than just "passive tone controls".

U2A is in the Low and High circuitry. U2B is in the Presence circuitry. U3A/B and U4B is in the Mid circuitry. (U4A is for the post EQ effects loop amp and the preamp out to the power amp).

This is also the same in the Nashville 112 as the exact same preamp board is used in both the Nashville 1000 and Nashville 112.

For reference, U1A is the input preamp and U1B is the return amp for the Pre-EQ effects loop. U5A/B is in the reverb circuit.

Lane Gray · From: Topeka, KS

Right, Jack. Passive means it can only cut, active can boost.
But doesn't it start with separating into those bands with similar filters? That just seemed the most obvious way to go about it.

PS: I love the way you, Brad, Tim and Stephen indulge my (and presumably others) curiosity and desire to learn more about these things.
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2 pedal steels, a lapStrat, and an 8-string Dobro (and 3 ukes)
More amps than guitars, and not many effects

Jack Stoner · From: Kansas City, MO

Being a tech and not a design engineer, I won't try to delve into how each circuit works in these amps.

However, the "Paramid" as Peavey calls it (Parametric Mid EQ) is more than an active Mid EQ circuit, it entails a frequency selectable filter and a control to either cut or boost that frequency. The Paramid is the most often misunderstood and misadjusted control(s) on Peavey steel guitar amps. For example, I've seen people that have cut/boost control set to "0" which means it isn't doing anything and see people intentionally set the frequency control to a certain frequency as they think it is doing something for that frequency.

chris ivey · From: california (deceased)

i run my treble and presence pretty low and i don't even have any mods.

Jack Stoner · From: Kansas City, MO

I usually run the High and Presence, around 0 to +1 depending on age of the strings. I've done this on all the different Peavey amps I've had, with or without mods. From the Session 500 to Nashville 400, Nashville 1000 and Nashville 112.

Michael Hummel · From: Ottawa, Ontario, Canada

Jack is a fabulous resource, having worked on all of these beauties for years. I don't have anything close to that experience.

However, as a design engineer, I have to correct one thing that Lane said:

Jim Bates · From: Alvin, Texas, USA

Thanks for all the info, and I learned something. Probably will just leave things alone and dial in (dial down highs) to get what I need.

I use three different pickups on my pedal steels:
Emmons LeGrand Emmons Humbuckers
Sho-Bud - Pro II Original Sho-Buds
Sho-Bud Super Pro Original BL705's

and really do not have to re-adjust amp much for any of them.

Of course my next gig will probably have a thick carpet on bandstand, and I won't be able to get enough treble!

Thanx,
Jim

Gary Cosden · From: Florida, USA

After Ken Fox did mt NV400 I commented that I could now turn the bass down a few notched and he agreed.

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