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Topic: Nashville 112 upgrade? |
Bob Grado
From:
Holmdel, New Jersey
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Posted 21 Mar 2007 12:47 pm |
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I noticed a Nashville 112 which sold on the forum
recently with a "Burr Brown op amp chip upgrade . This is the first upgrade I've heard being used on the 112. Can anyone explain what this upgrade does? |
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Morton Kellas
From:
Chazy, NY, USA 1
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Posted 22 Mar 2007 6:51 am
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| Do a search titled "Nashville 112 questions". I believe it is on the second page, at least today. This upgrade is a simple change out of the existing BA4560 chips for the Burr Brown OPA2604AP. The Burr Brown chips give the amp more warmth and sweeten the highs. Most like the change. I would not go back to the existing. I had two amps to A/B and there is a pleasant improvement in my opinion. |
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Mike Brown
From:
Meridian, Mississippi USA
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Posted 22 Mar 2007 7:37 am Nashville 112
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Ken Fox told me that he had tried using the OPA2604 IC's in place of the 4560's, and that the amp sounded cleaner and clearer. However, these chips cost more that the 4560's. We could have used them in the original Nashville 112 design but the price of the product would have increased. As always, we offer the best product at a reasonable price.
Also, some gain devices such as an IC can cause an increase in current within the circuit which might effect other electronic components in that circuit. This is the reason why this has to be tested by engineers before it is sold to the consumer.
Mike Brown
Peavey USA |
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Morton Kellas
From:
Chazy, NY, USA 1
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Posted 22 Mar 2007 8:09 am
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| Mike, several owners have been installing these chips with good results. I have not yet heard of any problems. The amp sounds great as is, the upgrade just improves on what is already good, Something like the mod kits do for the Nashville 400 amps but not as extreme. I was very impressed with the new lightweight speaker you showed me in Texas. I hope you are able to sell these soon. I want one. Thank you for all of the support you provide to forum members. |
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Terry Sneed
From:
Arkansas,
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Posted 22 Mar 2007 11:12 am The new chip for Nashville 112?
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Morten, can anyone without electronic experience install the chip? Where do you get them and what is the cost?
Terry |
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Michael Haselman
From:
St. Paul
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Posted 22 Mar 2007 1:47 pm
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Very simple mod. Do an Ebay search. I found them there in lots of 3. You need 5. Just a matter of pulling the chassis, carefully removing the chips and plugging the new ones in the socket, making sure the notch is on the same end as the one that came out. I'm not a tone nazi and I noticed a nice little change.
_________________
Mullen RP D10, Peavey NV112, Hilton volume. Hound Dog reso. Piles of other stuff. |
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Terry Sneed
From:
Arkansas,
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Posted 22 Mar 2007 5:34 pm chips
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Thanks Micheal.
Terry |
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Ken Fox
From:
Nashville GA USA
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Posted 22 Mar 2007 9:09 pm
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I have almost 300 in stock. I have had then in a lot of amps for the last 6 months with no issues. The same chip is used in the Profex 2 mod, Nashville 400 mod, Vegas 400 mod, etc. I have never seen an increase in current with the Profex 2 mods. I monitor the units with a digital amp meter when I install.
Per Texas Instrument specs the 4560 IC chip can draw 50 ma of current. The OPA2604 only draws 10.5 ma of current at the same voltage. |
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Jerry Erickson
From:
Atlanta,IL 61723
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Posted 23 Mar 2007 12:16 am
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Aha! That's why Mouser and Digi-Key don't have any. |
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Ken Fox
From:
Nashville GA USA
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Posted 23 Mar 2007 5:18 am
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Not true at all! I only got 100 before Mouser was out again until July! I waited a year to do that order! I buy mine at a higher price from another source. I have bought close to 1000 from them in the last year! I have to keep them in stock for the mods I do, no matter what the cost.
TI manufacturing can't keep up with orders, I suppose. |
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Ken Fox
From:
Nashville GA USA
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Posted 23 Mar 2007 6:40 am
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I totally agree with Mike about the use of the 4560 chips. They are the industry standard for most all amp manufacturers. The Burr Brown chip is a "boutique" upgrade for amps.
The N-112 was designed to offer a lower cost and extremely effective "practice" amp for steel players. Much as the late 1950's Fender Bassman was supposed to be a Bass amp, the first intent is not always what is gets used for! The little N-112 is standing up with the "big dogs" and doing a great job! Another testimony to the Peavey team.
The Burr Brown audio chips are something used more often in the "audiophile" world. Known for a sweeter tube like tone and far less background noise. Folks, they ain't cheap! Price of these would push up the final cost of any new amp.
Like the mods I do in the N-400 and Vegas 400 I use the Burr Brown chips as well as more expensive audio caps for the tone and audio sections. Again these are "boutique" mods. Mods I think are well worth the money effort. |
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Michael Haselman
From:
St. Paul
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Posted 23 Mar 2007 7:07 am
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Ken, have you or anybody used these in a Tubescreamer? I did a mod on my TS-5 and installed the RC4558, which was nice, and installed a socket so I can swap chips. I put the Burr Brown in, but couldn't really tell the difference in the house, so I put back the RC4558. I'd be interested if anyone A/B'ed these 2 chips.
_________________
Mullen RP D10, Peavey NV112, Hilton volume. Hound Dog reso. Piles of other stuff. |
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Ken Fox
From:
Nashville GA USA
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Posted 23 Mar 2007 7:24 am
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| I have not tried it. Seems pointless to use one in a distortion box to me! It seems the qualities of the chip are low background noise and a warmer clean tone. That might be hard to appreciate in a Tubescreamer. |
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Mitch Druckman
From:
Arizona, USA
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Posted 23 Mar 2007 7:56 am
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| Ken, there are also some 4560's soldered (not socketed) on the NV112 board. Have you considered if the amp would benefit from replacing them with OPA2604's? |
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Ken Fox
From:
Nashville GA USA
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Posted 23 Mar 2007 8:16 am
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| Yes, I have and am well aware of the SMT style chips used in the power amp and the effects loops. I do not do SMT devices! It takes special equipment and technique. I would not suggest changing them unless you are well trained and equipped to do so. Also that for sure would void your warranty, unless done by an Authorized Peavey Warranty Center and it was an approved mod, which it is not at this time. |
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