Modding the NM24

Eliminate Vibration

Several things can be done to eliminate any vibration from your audio component. After all, vibration does significantly play a role in degrading audio quality.

Isolation Feet

Use isolation feet. One can use the typical four point pattern for the feet or go with a three point pattern (two in the front and one in the back.) I use some Hi-Fi Tips available from Monarchy Audio. For the price these cannot be beat. To try and maximize the amount of surface area that touches the surface that they are used on, I place a nickle under each tip (compare the edge of a nickle to other coins and you will see why I chose a nickle.)



Above: Monarchy Audio Hi-Fi Tips

Dampening

For dampening and anti-vibration I use 3M Sound Deadening Pads that were placed where ever vibration may occur, and on the inside of the bottom, top, and sides of the case. These pads added considerable weight to the unit. If these pads cannot be acquired then self-adhesive sound deadening mats that are used in automobiles may be used. An advantage of these types of mats is that some of them have an aluminum foil surface that will help in shielding EMI/RFI.



Above: The top of a NM24 has been dampened using 3M Sound Deadening Pads. Care should be taken to not cover vent openings, screw holes, etc. You should also make sure that you leave enough clearance so that the cover can be used without any obstructions caused by the dampening material. Due to the price of the dampening material all scraps are used; hence, the irregular pieces. Use the material on the base as well. For heat-sinks, a small 1/4" square piece on the inside of each cooling fin will stop the fin from ringing. It is not necessary to use a larger piece than this, and to test it merely apply the 1/4" piece and then tap the fin with a screw driver both before and after the application to hear the difference.

Shield All IC's from EMI/RFI

To reduce EMI/RFI then all IC’s should be covered with anti-EMI/RFI tape. This is a slow process, and care must be taken not to allow the shielding tape to touch any of the any metal legs coming from the ICs, thus shorting out the IC. Not only should all OP Amps be covered, but also the DAC chip, and all other ICs. If the toroidal transformers are not in a separate unit, then shielding tape can also be used to cover them. Use the tape liberally. Here is the type of tape you want, and will cut to size.



Above: An IC in the NM24 with shielding tape applied.



Above: Several ICs in the NM24 with shielding tape applied.

Tube Dampers


There is some controversy when it comes to tube dampers; some swear by them and others think they do nothing to improve the quality of the audio at all. Personally, I realized I needed some dampers when my tubes started producing a high-frequency sound when they were on for more than an hour. The solution was obvious, but the options were not. Tube dampers will run anywhere from $10 to well over $200. The dampers that you will learn how to build below will cost around $5 each. Initially they may appear to be a bit crude, but in reality they actually are rather sharp looking and add a "retro" look to your system.

Complete instructions on how to make tube dampers/heat dissipaters for less than $5 each.



Above: Completed tube damper on a 6AS7 tube



Above: The NM24 with all of the above mods. Note the shielding tape around transformers.

Best Mod Available

The most significant mod that can be made to the NM24 is to hook it up to a Monarchy Audio AC Regenerator. The sound improvement it stunning. One great aspect of the AC Regen is the ability to change frequencies. This is especially helpful when listening to older vinyl/recordings as it eliminates a lot of the high-frequency noise found in such recordings . Below: The MA AC Regen



Most Recent Cap Modding

Below is from an email:

Recently a customer brought over a NM24 that had the Mundorf Silver foil/Oil upgrade  done by a mod guy
in Sacramento.

I was amazed at how much  more music could come out of the NM24, having listened to this model virtually every day
for the past 5 or 6 years.

I had actually advised customers not to do it, because the Mundorf cap is so big(much bigger than a Size C battery), the only way is to dangle them underneath the top cover, with wiring connected to the pcb, which might induce hum and noise.

But this mod guy chose a much smaller value (1uf) and yet there didn't seem to me any loss in the low frequency, which I was afraid 
might happen (original value 3.3u). Only this small value could be directly mounted on the pcb (after the WIMA caps removal)

The sound is so much more musical, more life like, more dynamic, I am absolutely convinced it is a very worthwhile  upgrade.
(this customer spent $400 parts and labor for this upgrade).

Note: you can purchase Mundorf caps at Partsconnexion.com

Please post any comments or feedback if you try this mod out.



Images of Mundorf 1uf Caps in NM24









The next mod will be the construction of an AC cord.

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