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Amps Atma-Sphere M-60 Mono blocks OTL design

I just purchased a used OTL Atma-Sphere M-60 mono blocks that I have sent to Atma-Sphere to be upgraded to the current model 3.3 and I also added the option of a higher quality power supply and V caps.

I have sold my old trusted Eggleston Andra 2’s speakers and have built some monitors using Aurum Cantus ribbons (102db) and Aurum Cantus midwoofers (90db) that are both rated as 8 ohm nominal. I have a DEQX Premate and will be crossing over to (2) JL Audio F-113 subs at 80hz.

Currently I am using a solid state high power stereo amp (Pass Labs) that I used with the Andra 2’s.

The Atma-Sphere M-60 is rated at 60 watts class A and is said to work better with higher impedance loads.

It will probably be a few weeks until I get the M-60 and was hoping someone could provide opinions of what to expect.

I listen to late 60 early 70’s classic rock music mostly. Sometimes loud.

ozzy

128x128ozzy
atmasphere's avatar
atmasphere
11,793 posts
 
@ozzy ,

The Tung Sol name got bought out a few years ago and is now being used to mark Russian-made 6SN7s. Usually these are the same tubes as the Electro Harmonix but with a brown base. They are nothing like the old-school Tung Sols which were a nice tube.

We've had some very good comments on the Psvane, Sophia and TJ Music tubes; along the lines of 'combining the best of the NOS tubes without the weaknesses' which is a pretty strong statement. You do still have to pick them for low noise and microphonics though, but generally this is not a big deal in the amps. 
knghifi
1,668 posts
 
Where's a good source for Russian and Chinese 6AS7?   
gdnrbob
4,444 posts
 
Thanks ozzy, I didn’t realize that new tubes had to be conditioned. When I got my MA-1, I just installed the tubes and listened (well, I did let thing run in for a while). I didn’t know that they were pre-conditioned- Well, I hope the were.
I will be surprised if you don’t keep the Atma’s. And, should that happen, I hope you will give your reasons.
Bob
ozzy's avatar
ozzy OP
7,459 posts
 

knghifi,

I did a search on EBay. There are quite a lot to pick from.

gdnrbob,

Thanks, I went this far expecting big things from the M-60's. But, I'm still not quite sure what to expect. After all, I will be coming from a SS amp that had all the power I ever needed and which has had many reviews that claim the Pass Labs amps has a tube like sound.

So, soon I will know about the Atma-Sphere.

Thanks Ralph for the additional information.

ozzy

charles1dad's avatar
charles1dad
10,250 posts
 
Pass Labs vs Atma-Sphere,  two thoroughbreds,  should be quite interesting. 
Charles 
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