Atma-SphereNirvana MonoblocksusedAtma-Sphere Nirvana Monoblocks (Ralph Karsten Masterpeice OTL Amplifiers)A True End Game OTL Amplifier by Atma-Sphere Looking for offers! need to sell Your chance to own a one of a kind OTL amplifier, Ralph Karsten True Master Piece with over 45 years of knowledge in...35999.00

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Atma-Sphere Nirvana Monoblocks (Ralph Karsten Masterpeice OTL Amplifiers) [Expired]

no longer for sale

A True End Game OTL Amplifier by Atma-Sphere

Looking for offers! need to sell


Your chance to own a one of a kind OTL amplifier,  Ralph Karsten True Master Piece with over 45 years of knowledge in the OTL Amplifier a no-compromise approach to build the very best!

 The Amplifier Brand new will cost you a good 65K USD or more depending on the current climate of parts and delays Estimated project time for a new build is almost two years! You can own this world-class Reference product at almost 45% off!

This is the Best Amplifier Atma-Sphere ever Produced, the best iv heard in my 30 years of audiophile journey and most likely an end game amplifier for 99% of the audiophiles out there.

The Nirvana is currently on an 18-24month build time and retails at 65K USD Brand New! Ralph is reluctant to take on new orders for this Amplifier as delays are unpredictable due to the current global climate, and parts are rising in cost or unstable. So the price could be going up, and so could be the build times. Here is your chance to own a true Titan in the Audio World! At a heavily discounted price! Possibly your End Game Amplifier as it's truly world-class, and I can't imagine how much more improvements can be made on an amplifier of this calibre. It was commissioned and built with only the best components & design circuitry.

his is Ralphs's Lifetime of Knowledge put into this Amplifier, he set out to create the best he can with no level of comprises with everything he knows till now! this is over 45 years of tube knowledge injected into this one Amplifier. I have owned all of Ralph OTL Amplifiers, so I feel I am in the position to compare them all, iv held a number of different amplifiers in my last 30 years but stuck by the OTL Longer than any other amplifier type.

To my Ears and Ralphs, Nirvana Sounds better than the Novacron, MA1 and & MA2. I have compared this side by side to the Novacrons, which were fully modified with 7241 tubes same as how John Wolff has set up his amps to run on the Classic Audio Loudspeakers. Whilst both had more things similar, Nirvana was quieter, smoother, and more transparent from top to bottom with a larger sound stage that fills the room, but the main obvious factor was the Bass depth and articulation. The Bass was tighter, faster, and went down a lot deeper, filling the acoustic space. The Nirvana is also more dynamics but at the same time can retrieve details far better than any other amplifier iv ever heard!!!

The midrange also felt more emotionally engaging on Nirvana there was more transparency on the mid-band, more naturalness that was ever so musically satisfying about it being so real and present in the room, whilst the sound stage was more comprehensive and more extensive ti spread much further and wider filling the room easily with no strain or compression. The Novacron were not far behind but there was a clear difference, but the difference can easily be felt and heard within the first few secs. Compared to the MA-1 and MA-2 the Nirvana just aced the show.

The MA-2 sells for almost 50K and produces more power but lacks the refinement this Nirvana amplifier gives one. The Nirvana can produce even more power up to 150 watts per channel if you use the right output tubes!


Ralphs Comments:
The power transformers are all custom for that amp with extra-low DCR in the windings, so there is less voltage drop under load.
The driver and driver filament supplies are regulated.
The output section uses an extra-low series resistance filter capacitor made by Panasonic, which features multiple connections to reduce the internal effects of a regular filter capacitor.
All the rectification is done with HEXFREDs.
This is the quietest OTL we've produced and also IMO the most neutral/best sounding. The chassis construction is a bit overboard for us; I got tired of other OTL entries clearly going for the bling and felt we needed something to show that we can operate at the same level.

The reason it is so much quieter is all the regulated power supplies. At the time that amp was conceived Tenor and Einstein both made amps with a similar price tag and neither sported any particular circuit advantages. They got away with it on bling alone. We figured we could do that only with the internals to match.

The Nirvana was built to see what was possible if everything in our OTL design were pushed to the limits. So everything in it is over-built, for example the power transformers are built with the least DC resistance allowable in their windings to prevent voltage sag while under load and also to run cooler. Sub chassis were used for the output and driver sections; filament and high voltage power supplies are regulated and ultra high performance filter capacitors employed in the output section. HEXFRED rectifiers are used for all the supplies and properly snubbed for ultra low noise operation.

On account of these measures the amp is silent on horn speakers and has very low intermodulation distortion, resulting in a very clean and musical first Watt. The sockets were custom built by Ebe, the last American manufacturer still making tube sockets. They will last decades. If course the amp is built with V-Cap Teflon coupling capacitors and high end resistors, custom wire made just for Atma-Sphere; every aspect of the amp was given this sort of attention. Naturally the chassis shows this off with super-polished and chromed machined panels showing it off.

All the Best,


Why Am I selling???
Simple Answer is: We are downgrading our business premises to a smaller demo room and can no longer host the Large Field Coils Speakers (Which are also for Sale) and the Accompanying Amplifier and Pre-amps. We are changing course to focus on smaller audio gear as this is easier for the local Indonesian market to absorb. The Local market is much weaker than nearby Asian markets and the level of high-end audio here in regards to sales are just not enough to warrant a class of amplifier and system of this calibre.

Sale and Assurance:
Ralph will assist me with the Sale of this Amplifier. Should the client have further technical questions can be directed to me or the manufacture?

If the Amplifier requires rewiring on different voltages, this can be sent back to Atma-Sphere for a full check-up and rewiring process. There will be a fee for this, and the buyer must cover the charges.

Currently, the Amplifier is wired for 230V (Accepts 220 to 240v)
This can be changed to 110-120v

Aesthetic Condition:
From the Very start the mirror finishing on one of the Monoblock's has never been so perfect (Needs to be buffed out for a longer time); when Ralph advised me of this, I was not too bothered and accepted it.

However, this mirror finishing seems shiny on one mono and cloudy on the other, so it needs to be buffed out by hand or machine; this does not detract from the sound or electrical condition.

The Amplifier Plays perfectly well every time. However, i can provide Very details photos for the interested buyers; I rate the Amplifier 7 out of 10 for this very reason.

Aesthetically it's 7 out of 10, (More like 8 out of 10)
Electronically I would assume almost 10/10 it's been ultra-reliable. Iv never had issues with this amp.

Shipping from Indonesia: I will pack these in wooden crates and will only use FedEx Unless the buyer wants to arrange to pick them up from our shop directly,.

Asking Price: 38,000 US dollars Negotiable. (Retails USD 65K ++)

SRA Isolation Platform in the picture are not included in the sale; I have a bunch of 6AS7G Tubes that can last the owner for decades! This will be given for free if my asking price is met. Otherwise, just the set of tubes will be included with the amps.

I have the Classic Audio Field Coils Speakers T3.4 Latest Versions also for Sale which match very well with these speakers which i am about to put up for Sale.

I will not accept Paypal for this large Transfer,

Only Bank Wire is acceptable,  Atma-Sphere can assist in the process for US clients.

Price is negotiable!!!
Buy it now will get you over 30 Power Tubes and 6SN7 Tubes to run the amplifiers for decades!

I have some Ultra Rare NOS 6AS7G Tubes i will provide if the buy it now price is met

Atma-Sphere can assist as a Third-party payment security


Price is Negotiable

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