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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
ozzy's avatar
ozzy OP
7,466 posts
 

Sure impressed with the Sophia / Full Music tubes with my M-60's.

ozzy

gdnrbob
4,444 posts
 
What were they replacing? This thread is getting pretty long. If I recall, they were pretty old.
And, where did you buy them? I am using the stock tubes from Atma-of which, I have no complaints, but am always interested in 'upgrades'.
Bob
ozzy's avatar
ozzy OP
7,466 posts
 

gdnrbob,

I have tried many tubes including some NOS RCA's from the 50's. To me the Sophia's are the best in sound quality. You can buy them direct from Sophia. They go about $100 each. But the Full Music looks and sounds just as good at 1/2 the price of the Sophia's.

ozzy

charles1dad's avatar
charles1dad
10,250 posts
 
Full Music is the source  for Sophia tubes.
Charles 
ozzy's avatar
ozzy OP
7,466 posts
 

Charles,

I don't think that's quite right.

I think the manufacturer in China is called TJ or something like that. Then they are different branded. I think Sophia's claim to fame is they select the higher quality tubes and then put there brand on them. At least that is my understanding.

ozzy

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